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Enabling edge AI with AI Connect

Whether you’re a hyperscaler connecting AI factories or a GPUaaS start-up, AI Connect helps you connect, scale and secure AI across the UK.

Neos Networks | 14 October 2026

AI is reshaping networks

As AI adoption takes off in everyday life, it’s changing not just the volume of network traffic but how and where it flows.

AI is moving closer to end users – closer to the edge. Inference is becoming the dominant AI workload, driving new traffic flows between end-user devices, edge locations and cloud infrastructure.

Meanwhile, agentic AI is set to drive ever greater traffic volumes through multiple API calls at machine speed.

With the rise of distributed AI, organisations increasingly need to connect AI across a mix of edge, cloud and core infrastructure. The challenge is delivering the right combination of performance, resilience and scalability throughout your AI journey.

Your AI connectivity challenge

Every organisation’s AI connectivity requirements are different.

As a hyperscaler or neocloud, you need to deploy resilient, high capacity infrastructure fast, connect new locations and scale nationwide.

If you’re a sovereign or regulated cloud provider, you’re after secure connectivity that supports sovereignty, compliance and operational control.

As a GPUaaS or AI start-up, you want to scale quickly without investing in more infrastructure than current demand requires.

Or if you’re connecting AI workloads within your organisation, you need reliable connectivity between users, sites, cloud platforms and data centres.

Different requirements. One common challenge: connecting, scaling and securing AI, wherever it takes you next.

Introducing AI Connect

AI Connect is Neos Networks’ portfolio of connectivity solutions for distributed AI. Build out AI networks from edge to core with Edge AI Connect, Cloud AI Connect and AI Infrastructure Connect.

Edge AI Connect

With Edge AI Connect, you can connect the far edge, bringing AI closer to users, devices and operations. Scale from 100Mbps to 100Gbps across branch locations, industrial sites and AI endpoints.

Cloud AI Connect

Cloud AI Connect allows you to simplify connectivity for multi-cloud AI applications across the UK. Securely connect multiple cloud platforms, SaaS applications and AI services with bandwidths from 1Gbps to 100Gbps.

AI Infrastructure Connect

AI Infrastructure Connect enables high-performance AI at scale. Connect GPU clusters and data centres with bandwidths from 10Gbps to 400Gbps+.

With AI Connect you can:

  • Deploy AI infrastructure anywhere across the UK.
  • Scale from edge AI to high-performance GPU infrastructure.
  • Build resilient networks for business-critical AI workloads.
  • Support sovereign and regulated AI deployments.
  • Connect faster with expert support and nationwide reach.
  • Simplify AI deployments with a single UK connectivity partner.

Explore AI Connect

Whether you’re deploying edge AI, building sovereign cloud platforms or scaling GPUaaS, AI Connect helps you create the right connectivity foundation for growth.

Want to discuss your network design and connectivity options? Contact us and one of our pre-sales specialists will be happy to help.

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Where is the edge in AI networks?

As AI adoption accelerates, inference is moving closer to where data is generated – closer to the edge. Here’s what that means.

Neos Networks | 9 October 2026

Connect, scale and secure AI deployments across the UK

Explore AI Connect

Where is the edge?

In AI networks, the edge is where inference runs physically closer to where data is created. Inference is introducing new data to trained models to generate outputs in real-world situations.

Rather than relying entirely on a central data centre, inference can take place on or near end-user devices to reduce latency for real-time decisions and boost efficiency and reliability. In addition, using the edge for data processing keeps sensitive data local, supporting data residency and sovereignty requirements.

Since ChatGPT broke onto the scene in 2022, frontier AI labs have focused on training models in large, centralised data centres. Now, as AI becomes embedded in everyday life, inference is becoming the dominant AI workload. It’s forecast to account for around two-thirds of all AI compute in 2026, up from a third in 2023.

But don’t expect all inference to end up on your phone or laptop. The edge isn’t a single location. It’s a continuum between end user and cloud, with distributed inference running in the location best suited to each application.

Far edge

 

Connected vehicles on a road -- far edge network

 

The far edge is the point closest to the end user where data is created or consumed. Think connected vehicles, industrial sensors, production lines, healthcare devices, mobile phones and smart glasses.

Why run inference at the far edge? Primarily for real-time decision-making, resilience and local data processing. Some applications need microsecond response times. Others need to keep operating if connectivity is disrupted. In some cases, privacy, security or data sovereignty requirements demand processing be kept local.

Typical workloads include:

  • AI-enabled quality control on production lines
  • Computer vision for hazard detection in connected vehicles
  • Predictive maintenance on industrial equipment
  • AI-assisted diagnostics on healthcare devices
  • On-device AI assistants on mobile phones

However, many applications still rely on nearby compute resources for additional processing. That's where the network edge comes in.

Network edge

 

Network edge devices communicating with a gateway server in factory

 

The network edge sits between far-edge devices and centralised cloud platforms. Examples include factory edge servers, branch office AI gateways and local platforms supporting smart cities, transport hubs and video analytics.

Here, organisations can aggregate data from multiple nearby sites or devices before sending selected traffic to the cloud.

Typical workloads include:

  • Connected vehicles and transport hubs
  • Smart CCTV aggregating video feeds from multiple cameras
  • Retail analytics across multiple stores
  • Smart city sensors feeding a local AI platform
  • Inference running on an edge gateway for hundreds of IoT devices

With more compute and storage than end-user devices, the network edge can support larger AI workloads while maintaining lower latency than the cloud.

In some architectures, inference also runs in nearby metro data centres, adding compute capacity while remaining close to users and devices.

As AI deployments scale, organisations may run workloads across a mix of edge and cloud environments.

Regional cloud infrastructure

 

Engineer adjusting server rack in data centre

 

Beyond the edge, AI workloads also run in regional or country-specific cloud infrastructure, including:

  • Private and sovereign clouds
  • GPU as a Service (GPUaaS) platforms
  • AI SaaS platforms
  • Hybrid edge-cloud environments

For example, in a hybrid deployment, a manufacturer may run real-time quality-control AI at the network edge. Meanwhile, AI models are updated and performance is analysed in a regional cloud.

Why the need for regional infrastructure? As AI adoption accelerates, it can support growing demand for GPU capacity and larger inference workloads. Crucially for some organisations, it can also help meet data residency and data sovereignty requirements.

Central cloud

 

Data centre with topped with solar panels

 

While some inference is moving to the edge, the central cloud remains the foundation of AI ecosystems. AI services such as ChatGPT and Claude, public cloud platforms like AWS, Microsoft Azure and Google Cloud, and private cloud environments all rely on large-scale data centre infrastructure.

They’re essential for:

  • Foundation model training
  • Large-scale AI research and development
  • Enterprise AI platforms serving users worldwide

However, distributed AI is set to reshape network traffic, from the far edge to the cloud and core networks. As model distribution moves from the cloud to the edge, inference workloads increase and the data we create grows in both volume and criticality.

The challenge is providing the right connectivity across the whole AI journey.

Connecting AI across the UK

At Neos Networks, we’re using our high capacity, UK-wide fibre network to help hyperscalers, neoclouds and GPUaaS providers extend AI networks across the UK, from far edge to cloud to core networks.

Connect, scale and secure AI deployments across the UK

Explore AI Connect

If you’re looking for connectivity for AI workloads, get in touch. Explore your options and network design with one of pre-sales specialists.

How ready are the UK’s regions for AI?

Can the UK’s regional connectivity support the next phase of AI growth? We spoke to 250 enterprise IT leaders and 100 service providers nationwide to find out.

Neos Networks | 1 October 2026

AI is taking off nationwide

AI assistants. Chatbots. Smart devices. AI is becoming part of everyday life. It's already being deployed across UK industries, from manufacturing and life sciences to media, energy and financial services.

As AI moves from training to inference, where trained models power real-world applications, workloads will increasingly run closer to end users. Demand for network capacity is set to soar, reshaping networks from core to edge.

Is the UK’s regional connectivity ready to support this next phase of AI growth?

To find out, Neos Networks surveyed senior IT infrastructure decision-makers at enterprises and service providers across the country.

Foundations for growth

Our survey suggests the UK has credible connectivity foundations for regional AI growth. Enterprise respondents see AI opportunities emerging across multiple regions.

Over the next year alone, 78% believe their current connectivity is mostly or fully prepared for a two-to-three-times increase in AI workloads.

However, there’s a paradox in the data. Despite this confidence, regional network constraints are already shaping where, how and even whether organisations can deploy AI at scale.

Proximity is critical

A key issue is proximity. Many enterprise-operated AI workloads need to be deployed close to end users to achieve the required latency and performance.

Nearly half (47%) of enterprise respondents say the AI applications they run need to be deployed in the same UK region as the end users. That includes private AI applications built on corporate data, model training environments and latency-sensitive inference services. Around a fifth (22%) of enterprises said deployment is needed within the same metro area.

So local connectivity is becoming a key factor in deciding where and how AI lands.

Reshaping AI plans

Regional infrastructure constraints are already forcing organisations to rethink where and how they deploy AI.

Overall, 92% of enterprise respondents say local connectivity infrastructure affects decisions about where to deploy or expand AI workloads.

Over the last two years, 38% say they’ve kept workloads more centralised than planned, 36% used cloud instead of regional or edge deployment, and 34% have moved workloads to another UK region (multiple responses allowed).

Bar chart showing how organisations say UK regional connectivity has affected their AI plans

 

Regional disparities, opportunities

Can local infrastructure support AI where enterprises need it? Or does it force workloads to be centralised, relocated, reduced or delayed? A digital divide is emerging between regions that can and can’t support AI at scale.

While our survey highlighted regional disparities, it also suggests several regions are set to become AI hubs.

Asked which region is most relevant to their organisation’s AI strategy over the next two to three years, 42% of enterprise respondents naturally picked London. But they also saw opportunities emerging across multiple UK regions (see report for details).

The regional picture also varies by sector. Different industries are likely to drive distinct regional AI growth corridors, reflecting local sector expertise.

End-to-end growth, data sovereignty

As AI use grows nationwide, our service provider research points to how networks will evolve in the regions.

Almost all (96%) see a shift towards inferencing or edge delivery over the next two to three years. But where do they expect AI-driven workloads to generate the greatest traffic growth? Opinions were divided across edge, metro, access, data centre interconnect and core networks (see report for details).

Data sovereignty is another key issue. Nearly all (97%) service providers say that data sovereignty and using local infrastructure are important to customers deploying AI workloads on their networks, with around half saying they’re very important.

In short, service providers are expecting AI to drive end-to-end network growth, while data location and local infrastructure remain critical for many applications.

Regional readiness, national opportunity

With world-class research, rapidly expanding data centres and government-backed AI Growth Zones, the UK has set its sights on becoming an AI superpower.

However, realising that ambition nationwide ultimately depends on the infrastructure connecting it all.

Our research shows large enterprises across sectors see AI opportunities emerging across several UK regions, not just London and the South East.

So regional AI readiness is a national opportunity. But how do we build the connected foundations for regional AI growth?

Download the report for insights on:

  • Which UK regions enterprises see as most important to their AI strategies
  • How connectivity is influencing enterprise AI deployment decisions across the UK
  • How service providers expect AI-driven network capacity to scale in the coming years
  • What enterprises and service providers believe is needed to support the next phase of AI growth

Enabling edge AI: building the network for distributed inference

As AI inference moves closer to where data is generated, traffic patterns are changing. Explore how distributed workloads are reshaping network demand and design.

Neos Networks | 19 August 2026

Edge AI defined

Edge AI places AI workloads close to where data is generated. Instead of sending every input to a central cloud or data centre, systems process it at the network edge, on or near the source.

That edge could sit inside a phone, vehicle, smart camera or industrial device. It could run on an on-site server in a factory, hospital or retail outlet. Or it could lie further upstream, within the access or aggregation network in a specific metro location, decreasing latency, increasing reliability and maintaining inference locally.

Edge AI locations

Graphic showing various edge AI locations, including a mobile device, an autonomous vehicle, a security camera and a factory

 

Wherever it runs, most edge AI involves inference: applying new data to a trained model to generate an output in real-world use. As AI moves from model development to widespread adoption, inference is becoming an increasingly dominant workload, driving more processing to the edge.

Why are inference workloads moving to the edge?

Four factors are driving this infrastructure shift:

  • Latency: Many emerging AI workloads can’t wait. Applications on mobile devices, factory production lines and vehicles may need on-the-spot decisions in milliseconds.
  • Efficiency: Sending every raw input or video stream to the cloud is costly and often unnecessary. Processing data closer to the source reduces bandwidth and backhaul demand.
  • Reliability: Reducing the number of hops by moving workloads to the edge can improve reliability.
  • Compliance: Processing sensitive data locally can keep it within a specific site or jurisdiction, helping regulated organisations meet privacy, security and data-residency rules.

In short, time-sensitive processing happens locally, while central data centres handle more compute-intensive workloads. That means faster responses, improved efficiency and greater control over sensitive information.

So edge AI complements, rather than replaces, centralised data centres, redistributing AI workloads and reshaping network demand.

What’s accelerating edge AI adoption?

Computer vision, robotics, autonomous systems and predictive maintenance are all driving demand for local, real-time data processing. As AI becomes part of everyday life, it’s being embedded across more devices, locations and real-world operations.

At the same time, evolving regulations governing both data at rest and data in motion are encouraging organisations to keep data local.

Meanwhile, the volume of data generated at the edge continues to grow. An estimated 21.1bn connected IoT devices were active worldwide in 2025. That figure could reach 39bn by 2030.

Advances in AI chips and model optimisation are also fuelling adoption. With the rise of small language models designed for specific edge use cases, AI inference is becoming practical on ever-smaller, resource-constrained devices.

And investment is following suit. IDC expects worldwide edge computing spending to reach $380bn by 2028, with AI among the fastest-growing workloads.

Overall, more applications demanding on-the-spot responses, more devices, more capable hardware, and new edge-capable models are all pushing AI beyond the data centre.

Types of edge AI architectures

Edge AI spans a range of compute, from endpoint devices and local gateways to on-site infrastructure. Where each workload runs depends on latency, compute, bandwidth, resilience and data-governance requirements.

On-device edge

The model runs on hardware such as a phone, smart camera, vehicle or industrial controller. Inference can continue without connectivity, avoiding network transit time. However, compute, memory, power and thermal limits constrain the models you can run.

Gateway edge

Several devices send data to a nearby gateway for inference. In a factory, for example, multiple cameras could connect to a local server running computer-vision models. This pools compute without sending every video stream off-site.

On-site edge

AI runs on infrastructure within a factory, hospital, retail outlet or other business site. You get more compute for demanding workloads while retaining selected data on your premises.

Network edge

Compute is hosted within the service provider’s network or in a particular metro area, closer to users and connected devices. For example, StonesThro is deploying edge AI cloud nodes at mobile infrastructure sites across the UK.

Hybrid edge-cloud

Hybrid architectures split workloads and data flows between edge and central infrastructure. The edge handles time-sensitive inference, while central platforms provide greater compute, model training, fleet management and long-term storage.

So edge AI is a continuum, not a choice between edge and cloud. Move the workload, and you change the traffic.

How are AI workloads reshaping network traffic?

AI is changing not just the volume of network traffic but its shape and direction. Several shifts are already emerging.

Inference is rising

Traffic measured across two service provider networks by Cisco shows AI inference volumes growing fourfold over eight months. While the absolute volume remains small, Cisco projects that AI inference traffic could account for around 25% of network traffic by 2035.

Lasting longer

Cisco also found that inference flows last roughly twice as long as typical web transactions. Responses stream token by token, creating smoother, more sustained flows rather than short bursts. And longer sessions have knock-on effects for capacity planning, load balancing, firewalls and intrusion detection.

Turning upstream

For decades, networks have been designed on the basis that downloads dominate. But more data-intensive inputs are starting to weaken that imbalance.

For example, Ericsson reports uplink growth is already outpacing downlink for many mobile service providers. Its scenario modelling suggests additional AI use could make mobile uplink traffic three times higher in 2031 than in 2025.

Multiplying interactions

Agentic AI could shift traffic growth up another gear. One AI agent may call several models, tools and APIs as it completes a task, operating 24/7 at machine speed. For example, in one controlled test, an agent-led task generated 450% more traffic than the equivalent human-led process, with inference accounting for 70% of the additional traffic.

Redistributing traffic

Distributed inference creates a complex mix of flows between edge systems, data centres and cloud platforms:

  • Inference outputs travelling to applications and control systems
  • Models and software updates moving out to edge systems
  • Increasing agentic AI traffic generated both centrally and locally
  • Workload traffic passing directly between distributed edge sites
  • Operational data returning for storage, analysis or retraining
  • Telemetry flowing back for monitoring and management

So the immediate challenge isn’t simply a flood of extra data. It’s managing more distributed, sustained, upstream-heavy and increasingly business-critical flows.

How should networks adapt for edge AI?

To support edge AI, networks must provide the performance, resilience and control required across the complete inference path. Here are some factors to consider:

  • Latency and location: An industrial control system demanding a response within milliseconds may need on-device or on-site inference. Less time-sensitive applications can often run at regional edge locations. However, moving inference closer doesn’t automatically guarantee a faster response. Model processing currently accounts for most of the latency in many LLM workloads, although network performance will matter more as inference accelerates.
  • Capacity and scalability: Edge processing may reduce raw-data backhaul, but it creates sustained upstream, cross-site and synchronisation flows. Capacity needs to scale in both directions and across more locations.
  • Resilience and diversity: Local inference can keep critical functions running when WAN connectivity fails. However, model updates, monitoring and cross-site coordination may stop. Diverse routes, rapid failover and defined fallback behaviour can protect the wider service.
  • Visibility and fault detection: A slow response could be due to a fault on the device, the network, the data pipeline or the cloud platform. Correlating network, infrastructure and application telemetry makes troubleshooting easier.
  • Encryption and security: While edge AI can keep sensitive data local, more devices, interfaces and sites can increase attack surfaces. Encryption, segmentation and consistent policy enforcement are essential to protect data in transit.

Ultimately, edge AI must perform securely and reliably across every node, route and location. So how do you maintain that performance at scale?

Scaling edge AI across the UK

Connectivity underpins the entire distributed inference architecture, carrying data, models and outputs between edge nodes, data centres and clouds. To scale, you need resilient, high capacity connectivity built for growing upstream, downstream and cross-site traffic.

However, not all edge AI traffic is created equal. An on-device inferencing application has very different network demands from a distributed GPUaaS platform or sovereign AI cloud.

Some use cases depend on dense metro connectivity, while others require high capacity, low latency links between data centres, edge locations and the cloud. Designing the right solution for each one is key.

At Neos Networks, we’re using our high capacity, UK-wide fibre network to help hyperscalers, neoscalers and microscalers extend edge AI networks across the UK.

Customer story: enabling edge AI with StonesThro

We’re helping pioneering UK microscaler StonesThro connect and scale its edge AI platform. Working with Cornerstone, the UK’s leading mobile infrastructure services provider, StonesThro is deploying sovereign edge AI cloud nodes at Cornerstone sites across the UK.

Learn more about StonesThro’s edge AI deployment

Build your edge AI network

If you need resilient, high capacity connectivity to support distributed AI inference across the UK, get in touch. We’ll help you explore the right connectivity for your architecture.

Edge AI FAQs

  • Can large language models (LLMs) run efficiently at the edge?

    Yes, LLMs can run at the edge, but efficiency depends on the model, hardware and use case. New, specialised small language models (SLMs) and techniques such as quantisation, pruning and hardware-aware optimisation can reduce memory and compute demands. However, larger workloads may need split inference across edge and central infrastructure.

  • What is split inference in edge AI?

    Split inference divides a model across edge and central infrastructure. The edge processes the first layers, then sends intermediate outputs to a more powerful server to complete the task, balancing device constraints against network latency and bandwidth.

  • When should inference run on-device rather than at the network edge?

    Run inference on-device when the hardware can support the model and the application needs to work offline or respond instantly. If the device lacks enough compute, a nearby network-edge server can run the model instead.

  • How do you monitor edge AI workloads across multiple sites?

    Use remote tracking software at each location to monitor hardware health, processing speeds, and data changes. Combine this data with automated security logs to spot tampering, software theft, and malicious attacks across all your devices.

  • Can existing WAN infrastructure support edge AI workloads?

    Small pilots may run on existing networks, but larger deployments often create new traffic flows between edge locations, data centres and cloud platforms. This can require higher capacity, lower latency connectivity. SD-WAN can help prioritise critical AI traffic and Cloud Connect can link edge AI workloads back to hyperscaler platforms, while optical connectivity can support scaled deployments between data centres.

  • How do you scale connectivity for edge AI?

    Scaling edge AI often means connecting more locations and supporting larger volumes of AI traffic. Networks must be able to add capacity, maintain performance and provide resilience without increasing operational complexity. Technologies such as SD-WAN can help manage traffic across distributed environments, while solutions like Optical Wavelengths can provide the deterministic connectivity required by AI workloads.

Choosing the right optical connectivity: Optical Wavelengths vs Spectrum vs MOFN vs Dark Fibre

From fully managed services to customer-operated infrastructure, explore which optical connectivity model best fits your capacity, control and growth requirements.

Neos Networks | 14 August 2026

Optical vs Ethernet: choose your layer first

If you're evaluating high capacity connectivity for DCI, backbone networks or AI infrastructure, first decide whether you need a Layer 2 service, such as Business Ethernet, or a Layer 1 optical service. The choice affects how capacity is delivered, managed and scaled.

Ethernet connectivity – Layer 2

As a Layer 2 service, Business Ethernet carries frames across a provider network and is delivered on a standard Ethernet interface. It’s ideal for managed connectivity between sites, campuses and wide area networks. Or you can extend your network with an Ethernet NNI, with capacities up to 100Gbps.

Optical connectivity – Layer 1

In contrast, optical connectivity services, like Optical Wavelengths, are Layer 1 optical transport. They deliver dedicated optical channels over fibre for high capacity DCI, backbone networks and other optical transport applications, typically from 100Gbps to 400Gbps.

Learn more about Optical networks vs Ethernet

So, if optical connectivity is what you need, which optical solution best fits your business case?

Optical Wavelengths vs Spectrum vs MOFN vs Dark Fibre: key differences

Optical Wavelengths, Spectrum, MOFNs and Dark Fibre can all deliver high capacity connectivity. What differs is how capacity is deployed and scaled, who controls the optical layer, and how operational responsibility is divided between customer and provider:

  • Optical Wavelengths: A fully managed Layer 1 service delivered as dedicated wavelengths over a provider-managed DWDM network, typically at fixed capacities such as 10Gbps, 100Gbps or 400Gbps. Best when you want high capacity connectivity without managing the optical layer. Learn more about Optical Wavelengths
  • Spectrum: A defined allocation of optical spectrum on a provider-managed DWDM network, allowing you to scale capacity within that allocation. Best when you need more control over capacity than a fixed-capacity wavelength service, without operating the full optical line system yourself. Learn more about Spectrum
  • MOFN: A dedicated optical network designed around your routes, topology, resilience requirements and capacity growth plans. Best when you need dedicated optical infrastructure without taking on Dark Fibre-style operational responsibility. Learn more about MOFN
  • Dark Fibre: Dedicated unlit fibre that you light using your own optical equipment. Best when you want maximum control over capacity, technology and upgrade paths, and have the expertise to operate the optical layer. Learn more about Dark Fibre

Optical Wavelengths vs Spectrum vs MOFN vs Dark Fibre

A comparative table of the key features of Optical Wavelengths vs Spectrum vs MOFN vs Dark Fibre networks

In short, Optical Wavelengths provides fixed-capacity connectivity in a fully managed model, while Dark Fibre gives you maximum control over network design, capacity and technology choices. Wavelength services are typically fast to activate as capacity and routes are pre-built, ready to implement additional services.

Spectrum and MOFN sit between Optical Wavelengths and Dark Fibre, offering more flexibility and scalability than a wavelength service without the operational responsibility of Dark Fibre.

Choosing the right optical connectivity

Choosing between Optical Wavelengths, Spectrum, MOFN and Dark Fibre comes down to how much control, scalability and operational responsibility you need. Here are some questions to consider.

Capacity and scalability

How much bandwidth do you need today and in the long term? Will you scale by ordering more services or by growing capacity within infrastructure you control?

Latency and performance

How latency-sensitive are your workloads? Are provider SLAs enough, or do you need to optimise routes, diversity and resilience yourself?

Control and flexibility

Do you want to choose your own optical hardware, vendors and upgrade cycles? Or would you rather your provider manage them for you?

In-house expertise

Do you have engineers who can design, run and maintain a DWDM line system? Are you prepared to build or buy that capability as a service?

Cost: capex vs opex

Does your business case favour predictable opex or long-term capex investment? Are you ready to fund equipment upgrades or leave it to your provider?

Security and compliance

Do your data sovereignty or compliance requirements demand dedicated infrastructure? Do you need to control encryption?

Time to deploy

How quickly do you need services live on each route? Would a managed option (Optical Wavelengths, Spectrum or MOFN) get you live faster than a Dark Fibre deployment?

Your answers to these questions will point you towards one optical connectivity solution, or a combination of services. Which is right for your organisation?

Which optical connectivity is right for your organisation?

The right choice comes down to how much control, scalability and operational responsibility you need. Choose:

  • Optical Wavelengths if you need high capacity DCI or backbone connectivity in a fully managed service model.
  • Spectrum if you want to scale capacity within your own spectrum allocation without running the full optical line system.
  • A MOFN if you need dedicated optical infrastructure built around your routes and growth plans, delivered as a managed service.
  • Dark Fibre if you want maximum control and near-limitless capacity and have the expertise in-house to operate the optical layer yourself.

At Neos Networks, we can deliver high capacity, low latency optical connectivity for your business across our B2B-only, UK-wide fibre network, built to support UK Critical National Infrastructure.

Whether you're scaling DCI, expanding a backbone network or building AI infrastructure, our pre-sales team will help you find the right fit. For more details, download our network map or get in touch.

Managed optical fibre network (MOFN): scalability without the complexity of Dark Fibre

A MOFN is your own dedicated high capacity fibre optic network built for your business by a third-party provider – a fast way for hyperscalers, cloud providers and large enterprises to extend their reach nationwide.

Neos Networks | 30 June 2026

What is a managed optical fibre network (MOFN)?

A managed optical fibre network (MOFN) is a dedicated optical network delivered to you as a managed service on a provider’s fibre network. It’s built for private optical transport and can scale to very high bandwidths, typically using Dense Wavelength Division Multiplexing (DWDM).

Either you or the provider may own and operate the optical line system and transponders, depending on the operational model. However, the provider typically manages the service, network operations and maintenance. You can scale capacity over time by adding more wavelengths.

It’s like having your own private optical network without the burden of running it. That gives you more flexibility than wavelength services or Spectrum but less operational responsibility than Dark Fibre.

If you’re a hyperscaler, neoscaler, cloud provider or large enterprise, a MOFN can help you scale across regions fast. It’s especially useful in areas where Dark Fibre access or operating rights are hard to secure.

How does a MOFN work?

With a MOFN, you define what you need. Your provider then designs and runs a dedicated optical network for you as a managed service.

Here are three steps to build a MOFN:

  1. Design: Set requirements for bandwidth, topology, routing, latency and resilience. Your provider uses these to shape the optical design and operating model.
  2. Deploy: Your provider provisions the route and commissions the service. This may use DWDM, with optical amplifiers and ROADMs where needed for reach and routing.
  3. Manage: Once your network is live, your provider monitors, maintains and troubleshoots the service. When you need more capacity, you scale by adding wavelengths or upgrading the optical equipment at the ends.

In practice, how your MOFN is managed, including upgrade work, depends on your provider and the deployment model you choose. Let’s look at the main types.

Types of MOFNs

MOFNs typically come in three major models, or a blend of models, depending on how much control and operational responsibility you want.

Fully managed MOFN

With a fully managed MOFN, your provider builds, operates and maintains the network as a service. You set the outcomes, such as routes, latency targets and capacity growth, without running the network yourself.

Managed lit fibre MOFN

This model is similar to a leased-capacity service, like Optical Wavelengths. However, it runs on dedicated infrastructure built to your requirements and preferred technology. You get the convenience of a managed wavelength service but with more bespoke characteristics.

Hybrid MOFN

In this hybrid model, the provider handles the core infrastructure, while you handle more of the optical technology. For example, the provider builds and operates the optical line system (OLS) as a service, including ROADMs and amplification where needed. You may install and manage your own transponders, giving you more control over capacity and hardware choices.

All three models can run over various physical topologies, including point-to-point, ring or mesh. Your choice of model depends on your priorities, whether you need maximum control, faster deployment, cost efficiency or long-term scalability.

What are the benefits of a MOFN?

Here are some of the main advantages of MOFNs compared to other optical service options.

Purpose-built, private network

A MOFN delivers Dark Fibre-style private infrastructure as a managed service. That gives you greater control over how your network is designed, secured and operated, supporting data sovereignty and compliance.

Faster route expansion

With a MOFN, you can fill network gaps and extend into new regions faster than leasing Dark Fibre and running the network yourself. It’s especially useful where Dark Fibre access or the rights to own and operate infrastructure are hard to secure.

Designed-in scalability

MOFNs are built around your growth plan, so you scale by evolving the optical design over time. With Spectrum, you scale within a defined spectrum allocation. In contrast, Dark Fibre offers almost limitless scalability, but you supply and run the optical equipment yourself.

More control

With a MOFN, you can shape the network design more than with fixed-capacity Optical Wavelength services. In some models, you run your own transponders at the ends while your provider runs the optical line system.

Performance and resilience

MOFNs let you optimise routes for low latency, diversity and resilience, backed by SLAs. And your provider runs it day to day, so you don’t carry the operational burden.

Predictable costs

Because a MOFN is a managed service, you can avoid much of the upfront capex of Dark Fibre. Instead, you pay for SLA-backed service delivery as opex, so costs are easier to plan.

So, is a MOFN the right fit for how you build and scale your network?

Is a MOFN right for your business?

If you’re a hyperscaler, neoscaler or cloud provider, a MOFN can help you connect data centres at scale across regions. As AI shifts from training to inference, you can build out capacity to serve growing workloads at the edge. And with a dedicated network model, you have more control over performance, security and how the network is built. So it’s easier to meet evolving data sovereignty and security requirements.

In short, a MOFN can be a good choice if you:

  • Plan to scale DCI or backbone capacity and need a long-term optical growth path, not just a single fixed-capacity service.
  • Need dedicated infrastructure built around your routes, topology and resilience targets, rather than a generic shared platform.
  • Want more control than a fixed-capacity managed wavelength service but don’t want to run the optical infrastructure yourself.
  • Need to move quickly on new routes without the lead times and operational responsibility of a Dark Fibre rollout.

Here are some examples of organisations that can benefit from MOFNs:

Industry/sector Example use case
Hyperscalers, microscalers, neoscalers and cloud providers Build DCI, backbone and edge connectivity on dedicated optical infrastructure you can scale fast.
Telcos and wholesale service providers Deliver dedicated optical infrastructure as a managed service for customers that need fast expansion on key routes.
Large enterprises with multiple data centres Connect business-critical sites with dedicated, scalable optical infrastructure.
Organisations with growing AI workloads Support high-capacity, low-latency interconnect between data centres, AI sites and edge locations.

 

In short, if fixed-capacity Optical Wavelengths or a defined Spectrum allocation won’t give you enough flexibility, a MOFN can be a strong fit. It’s especially useful for long-haul or business-critical core networks designed to scale over time.

MOFN solutions

If you’re considering a MOFN to scale DCI or core connectivity across the UK, we can help. At Neos Networks, we operate one of the UK’s largest B2B‑only fibre networks, built to support the UK’s Critical National Infrastructure nationwide.

Download our network map

From fully managed Optical Wavelengths to almost limitless Dark Fibre, we deliver high capacity, low latency optical connectivity across the UK. To discuss the right optical solution for your business, get in touch.

We make connectivity work for your long-term growth.

MOFN FAQs

  • What is the difference between a managed optical fibre network (MOFN), Spectrum and Dark Fibre?

    A MOFN, Spectrum and Dark Fibre can all deliver high capacity optical connectivity, but they differ in how much control you have and who operates the network:

    • A MOFN gives you a dedicated optical network delivered as a managed service, so your provider designs, operates and maintains the infrastructure for you.
    • With Spectrum, you lease a defined slice of optical spectrum on a provider-managed network and decide how to use that capacity within the allocation.
    • With Dark Fibre, you lease unused fibre and install and operate the optical equipment yourself, giving you maximum control but full operational responsibility.

  • Do you need in-house optical expertise to use a MOFN?

    You don’t need in-house expertise to run the fibre or optical line system because your provider manages the network day to day. However, if your MOFN model includes customer-owned equipment, such as transponders at the ends, you’ll need to be able to operate and maintain that hardware.

  • How much bandwidth can a MOFN support?

    A MOFN can support very high bandwidths, all the way from 10Gbps through to multiple 100Gbps or 400Gbps channels up to terabit-scale capacity, depending on the optical design and equipment used. Because it can use DWDM, you can scale capacity over time by adding wavelengths or upgrading optics rather than rebuilding the network.

  • Is a MOFN more cost-effective than Dark Fibre?

    A MOFN can be more cost-effective because you can avoid much of the upfront investment and ongoing costs of running your own optical network. With Dark Fibre, you typically fund and operate the optical equipment yourself, while a MOFN is delivered as a managed service, making costs easier to plan.

  • How quickly can a MOFN be deployed in the UK?

    A MOFN can typically be delivered faster than a Dark Fibre rollout because your provider uses existing fibre infrastructure and manages the optical network for you. In contrast, Dark Fibre often involves longer lead times to secure routes, deploy infrastructure and install optical equipment, especially on new or underserved routes.

  • Where are MOFN services available in the UK?

    MOFN services are available on fibre routes where providers can deliver dedicated optical infrastructure, typically across national backbones, regional networks and key data centre corridors. At Neos Networks, we operate one of the UK’s largest B2B-only fibre networks, with extensive national, regional and metro routes.

    Download our network map

Spectrum in optical networking: scaling capacity between wavelength services and Dark Fibre

Learn how Spectrum works and how it can help hyperscalers and large enterprises scale high capacity connectivity fast nationwide.

Neos Networks | 15 May 2026

What does “spectrum” mean in optical networking?

In optical networking, spectrum refers to the range of light frequencies (or optical wavelengths) used to carry data over fibre cables. These wavelengths sit within specific optical bands, most commonly the C-band (1530-1565nm) and L-band (1565-1625nm).

Telecom providers use technologies like Dense Wavelength Division Multiplexing (DWDM) to divide this optical spectrum into multiple channels. As a result, several data streams can run over a single fibre simultaneously, significantly boosting capacity and efficiency.

With Spectrum as a service, you’re allocated a defined portion of this optical spectrum on the provider’s network. The underlying optical infrastructure is managed for you, while you retain control over how capacity is used. This delivers many of the high performance and scalability benefits of MOFNs and Dark Fibre, without the costs or operational complexities associated with those options.

How do Spectrum services work?

Spectrum is typically delivered as a point-to-point service, making it ideal for high capacity data centre interconnect (DCI) or core networks. It gives you access to a defined slice of the optical spectrum, rather than a single wavelength or an entire Dark Fibre route. For example, you might be allocated 75GHz or 200GHz, which you can divide into multiple DWDM channels as needed.

Fixed grid or flex grid

Spectrum may be delivered using fixed grid or flexible grid (flex grid) technology, sometimes referred to as gridless. Flex grid supports variable channel widths, which can allow more efficient use of the available spectrum.

Fixed-grid vs flex-grid spectrum

E-Line Carrier Ethernet showing a direct point-to-point connection between two locations across a provider's network

 

Division of responsibility

The provider delivers a clean spectrum path between two locations and manages the underlying optical line system. That includes the fibre, in-line amplification and ROADM nodes along the route.

Depending on the service model, you or your provider may own and operate the transponders that light the fibre at each end. Either way, Spectrum gives you control over how capacity is deployed without the need to run a full optical line system over Dark Fibre.

Positioned between managed Optical Wavelength services on the one hand and MOFNs and Dark Fibre on the other, Spectrum is ideal if you need more control than a wavelength service but aren’t ready for a MOFN or Dark Fibre.

How does Spectrum differ from Optical Wavelength services and Dark Fibre?

Spectrum offers a different balance of capacity, control and operational responsibility compared with Optical Wavelengths and Dark Fibre. A fourth option, a Managed Optical Fibre Network (MOFN), also sits within this range of optical services.

Here’s how Neos Networks’ optical services compare:

  • Optical Wavelength services: A fully managed service with a fixed capacity (e.g. 10Gbps, 100Gbps or 400Gbps) delivered by the provider. The provider owns and manages the optical line system and transponders, so you simply connect and use the service.
  • Spectrum services: You lease a block of optical spectrum, for example 75GHz, delivered over the provider’s DWDM line system. While the provider manages the fibre and line system, you or the provider may own and operate the transponders. This gives you more control and scalability than a wavelength service without the complexity of running a full optical line system over Dark Fibre.
  • MOFN: The provider designs, operates and manages a dedicated optical network over their fibre infrastructure. Either you or the provider owns the DWDM line system and transponders, depending on the setup. You scale capacity by changing the optical network design, giving you more flexibility than Spectrum but less operational responsibility than Dark Fibre. It’s like having your own private DWDM network, without the operational complexities and responsibilities.
  • Dark Fibre: You lease a pair of unused fibres and provide and operate the DWDM line system and transponders used to light them. This gives you maximum control and near-limitless scalability, but full responsibility for your network operations.

What are the benefits of Spectrum?

Spectrum combines high capacity, flexibility and control. Here are the main benefits for your business.

Flexible bandwidth growth

Scale capacity by adding or upgrading wavelengths within your allocated spectrum. No need to order additional services as demand increases.

Control without Dark Fibre overhead

Gain greater design control and vendor-agnostic options than with Optical Wavelengths, without the costs or complexity of Dark Fibre. Align optical hardware choices and upgrade cycles with your wider network strategy.

Rapid deployment using existing infrastructure

Activate high capacity services faster than with a new Dark Fibre build, using pre‑deployed fibre and optical line systems. Reduce time to service on critical routes.

Resilience and route diversity

Design optical-layer diversity within the Spectrum service, rather than relying on fixed protection models. You can work with the service provider to predefine physical routes during the setup phase.

Is Spectrum right for your business?

Spectrum is a good option if you need high capacity optical connectivity with more control at the optical layer than traditional managed services. With the right in-house expertise, you can make full use of your allocated spectrum to scale fast, without the cost and complexity of Dark Fibre.

Here are some examples of Spectrum use cases.

Industry/sector Example use case
Hyperscalers and cloud providers Run multiple 100Gbps or 400Gbps channels across your backbone using your own equipment and network architecture.
Telcos and wholesale service providers Provision new high capacity connectivity for your customers without relying on wavelength services or operating Dark Fibre.
Large enterprises and financial services Connect business sites and data centres with more control at the optical layer than with fully managed services.
Broadcast and media companies Manage high‑bandwidth links to transport large video files or live content nationwide with consistently low latency.
Research and education Support advanced research applications that demand scalable, high capacity connectivity with predictable performance.
Public sector organisations Scale up public service links to meet growing digital demands more cost-effectively than with Dark Fibre.

 

In short, Spectrum is a good fit if you want to design and scale high capacity optical connectivity yourself without leasing Dark Fibre.

Neos Networks Spectrum solutions

At Neos Networks, we specialise in delivering high capacity optical connectivity across the UK, including Optical Wavelengths, Spectrum, MOFN and Dark Fibre. Extend your reach with our B2B-only, UK-wide network.

If you’re a hyperscaler or large enterprise looking for high capacity connectivity you can scale fast, get in touch. Our pre-sales team will help you choose the right optical links for your organisation.

Spectrum FAQs

  • Is Spectrum the same as Dark Fibre?

    No. With Dark Fibre, you lease unused fibre and install and operate all the optical equipment yourself. With Spectrum, you lease a defined block of optical spectrum on a provider‑managed DWDM network, so you get more control than a wavelength service without running the fibre or line system.

  • Where is Spectrum available in the UK?

    Spectrum is available on fibre routes where providers operate DWDM‑enabled optical line systems, typically across national backbone and major regional networks. At Neos Networks, we operate one of the UK’s largest, business‑only fibre networks, with extensive national, regional and metro fibre routes.

    Download our network map to check availability at your locations.

  • Do you need in‑house optical expertise to use Spectrum services?

    You don’t need in‑house expertise to run the fibre or DWDM line system because they’re managed by your provider. However, if you choose to own and operate your own transponders, you’ll need the appropriate optical skills to manage that equipment.

  • How much bandwidth does Spectrum support?

    Spectrum supports very high bandwidth, from multiple 100Gbps channels up to terabit-scale capacity, depending on your spectrum allocation and how you configure it. You can scale capacity by adding or upgrading wavelengths within your spectrum, rather than ordering new services or installing new fibre.

  • Is Spectrum more cost-effective than wavelength services?

    Spectrum can be more cost‑effective than wavelength services at higher bandwidths because you scale capacity within a single spectrum allocation instead of paying for multiple fixed‑rate wavelengths. At lower capacities, a managed wavelength service is often simpler and cheaper. Whether it’s cheaper depends on how much bandwidth you need and how fast you plan to scale.

  • How quickly can Spectrum services be deployed in the UK?

    Spectrum can be delivered in around 30 days – often faster than Optical Wavelengths – because it uses existing DWDM‑enabled fibre and optical line systems. Deployment times depend on route availability and site readiness.

    Download our network map to check availability at your locations.

Dark Fibre vs Lit Fibre

Dark Fibre and Lit Fibre both deliver high capacity, low latency connectivity for data-intensive applications. Which is right for your organisation?

Neos Networks | 20 April 2026

Dark Fibre

Fully control your network with near-limitless scale

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What is Dark Fibre?

Dark Fibre, also known as unlit fibre, is fibre optic cable that’s installed but not transmitting data. It’s called “dark” because there’s no light signal running through it.

A network provider supplies and maintains the passive fibre infrastructure, such as fibre cables and ducts. You provide your own optical equipment to “light” the fibre and create your own high capacity network.

As a result, the bandwidth and performance depend on the equipment you use and the characteristics of the fibre. You’re responsible for deploying, monitoring, maintaining and securing your network, which gives you maximum control over how it operates.

That’s why Dark Fibre is often used to connect data centres, network exchanges and large sites where high capacity, low latency and long‑term scalability are critical.

What is Lit Fibre?

Lit Fibre is managed optical connectivity where the provider delivers a service over fibre they operate. That means they provide the passive fibre infrastructure and the optical equipment to transmit data.

Lit Fibre is delivered with defined bandwidths and transmission speeds. For example, you can order Neos Networks Optical Wavelength services in bandwidths of 10Gbps, 100Gbps or 400Gbps+. As an end-to-end service, the provider manages configuration, monitoring and fault resolution, with performance governed by SLAs.

Lit Fibre is commonly used by organisations that want high capacity connectivity with predictable performance but don’t need full control over how the network operates.

Dark Fibre vs Lit Fibre: key differences

Here’s an overview of how Dark Fibre differs from lit optical services like Optical Wavelengths:

Dark Fibre Lit Fibre
Definition Unlit optical fibre that you typically lease to operate your own network Optical connectivity delivered as a managed service by your provider
Control You control the network, including deployment, monitoring and maintenance Your provider controls the network and offers a fully manage service
Equipment You supply and manage the optical networking equipment Your provider supplies and manages all optical equipment
Scalability Almost limitless: bandwidth depends on the equipment you deploy and fibre specification Highly scalable but limited to your provider’s predefined service tiers
Expertise Requires in-house expertise (or trusted partners) to design and manage the network Doesn’t require specialist optical networking expertise from the customer
Commercial terms Typically contracted on a long‑term lease, like Indefeasible Right of Use (IRU) Typically contracted as a managed service with recurring charges
Reliability Depends on how you design, operate and maintain your network Depends on your provider’s network design, resilience and SLAs
Costs Higher upfront investment in equipment, with cost per gigabit falling as capacity increases Lower upfront costs, with ongoing charges based on the service provided

 

Capacity, scalability and latency

Key deciding factors when choosing between Dark Fibre and Lit Fibre include capacity, scalability and latency.

First, with Dark Fibre, capacity is determined by the optical equipment and wavelengths you deploy, rather than predefined service limits. In contrast, Lit Fibre is delivered in predefined service tiers (10/100/400Gbps+ for Optical Wavelengths). So Dark Fibre is ideal if you want very high bandwidth that you directly control.

Second, while lit optical services scale in increments within a provider’s service tiers, Dark Fibre is almost infinitely scalable. You can boost capacity as much as you like by upgrading the equipment lighting the fibre, subject to the fibre’s physical limits.

Finally, both Dark Fibre and Lit Fibre can support very low latency connections when routes are optimised, as they use the same fibre infrastructure. However, Dark Fibre gives you greater control to optimise the routing and optical equipment to meet specific low latency requirements.

Control, management and security

Control and operational responsibility differ significantly between Dark Fibre and Lit Fibre, and those differences affect how security is implemented.

With Dark Fibre, you select and operate the optical equipment yourself. You control the network at the Physical Layer (Layer 1), deciding how capacity is delivered and scaled. With Lit Fibre, your provider controls the network design and active optical systems.

That control brings responsibility. With Dark Fibre, you manage day‑to‑day operation, monitoring and fault management, while the provider maintains only the passive fibre infrastructure. With Lit Fibre, the provider delivers and operates the service end to end under agreed SLAs, shifting operational risk away from you.

These differences also shape your security approach. Neither Dark Fibre nor Lit Fibre is inherently more secure, but Dark Fibre allows you to implement bespoke encryption and security controls, which can be important in regulated environments. Lit Fibre relies on provider‑defined security built into the service, which may well be sufficient if you prefer a managed model.

Dark Fibre and Lit Fibre costs compared

Dark Fibre and Lit Fibre have different cost structures because they follow different contractual models.

Commercial model

With Dark Fibre, you typically secure long‑term rights to use the fibre, often through an Indefeasible Right of Use (IRU). You then provide your own optical equipment to light and operate the network. In contrast, with Lit Fibre, the provider owns, operates and prices the network as an ongoing service.

Capex vs opex

Dark Fibre involves higher upfront capex. You need to invest in optical equipment, fixed fibre lease costs and, in some cases, fibre build. Lit Fibre is primarily an opex model, with costs charged as recurring service fees for capacity, network operation and support.

Fibre tax and telecoms licence

Unlike Lit Fibre, Dark Fibre attracts business rates, also known as “fibre tax”, once the fibre is lit. These annual charges, levied by local authorities per connection, add to your ongoing network costs. You may also need to pay for a telecoms licence, depending on how you use the fibre.

Total cost over time

All these differences impact the cost of scaling over time. With Dark Fibre, you can usually increase capacity by upgrading your own equipment without increasing the fibre lease cost. With Lit Fibre, scaling usually involves moving to higher service tiers, which increases monthly charges.

So Dark Fibre can deliver a lower cost per gigabit at higher capacities or over longer timeframes. For shorter commitments or where bandwidth requirements are lower or stable, a managed Lit Fibre service is often more cost-effective.

Dark Fibre vs Lit Fibre: which is right for your business?

Ultimately, choosing between Dark Fibre and Lit Fibre depends on how much control you want over your network, how you plan to scale capacity, and how much operational responsibility you’re ready to take on.

Do you want full control over your network? What are your long-term bandwidth needs? Do you have the internal IT resource and expertise to deploy and maintain your network? What about upfront and long-term costs?

Consider Dark Fibre if you:

✓ Want maximum control over your network design and performance
✓ Need very high or rapidly growing bandwidth over time
✓ Have the in-house skills (or trusted partners) to deploy and manage your own network equipment
✓ Require control at the Physical Layer and need to implement bespoke encryption or security controls
✓ Are ready to invest more upfront for potentially lower cost per gigabit in the long term

Dark Fibre

Fully control your network with near-limitless scale

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Consider Lit Fibre if you:

✓ Prefer the provider to own, operate and maintain the network
✓ Have stable or well‑defined bandwidth requirements within standard service tiers
✓ Need a quicker deployment without managing optical infrastructure
✓ Are happy with your provider’s network security, performance guarantees and SLAs
✓ Want predictable, recurring costs with minimal upfront investment

Optical Wavelengths

Get ultrafast, low latency connectivity up to 400Gbps+

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Not sure which is right for you?

At Neos Networks, we specialise in delivering high capacity, low latency connectivity across our B2B-only nationwide network built for Critical National Infrastructure. Discover our UK-wide network.

If you’re looking for Dark Fibre, our experts work with you to map the optimal route, overcome challenges and plan for growth. Whether you need a flexible, short-term lease or a 25-year IRU, we design the best solution for you and your budget.

If you prefer managed Optical Wavelengths up to 400Gbps+, we specialise in serving hard-to-reach areas with our extensive nationwide network and a wide range of third-party tails.

Want to discuss your options? Get in touch.

Dark Fibre vs Lit Fibre: FAQs

  • Is Dark Fibre faster than Lit Fibre?

    No, not necessarily. Both Dark Fibre and Lit Fibre, including Optical Wavelengths, use the same fibre infrastructure and can deliver very high speeds. However, with Dark Fibre the maximum speed depends on the optical equipment you deploy, while Lit Fibre is delivered at predefined service speeds set by the provider.

  • Does Dark Fibre deliver lower latency than Lit Fibre?

    Both Dark Fibre and Lit Fibre run over the same fibre infrastructure, so both can deliver very low latency when routes are well designed. But with Dark Fibre you have more control to optimise routing and optical equipment for specific latency requirements, rather than relying on provider‑defined service parameters.

  • Is Dark Fibre more secure than Lit Fibre?

    Neither Dark Fibre nor Lit Fibre is inherently more secure. Security depends on how your network is designed and operated. With Dark Fibre, you control the optical and network equipment yourself, allowing you to implement bespoke encryption and security controls. With Lit Fibre, security is defined and managed by the provider as part of the service.

  • Are Dark Fibre and Lit Fibre services available across the UK?

    Dark Fibre and managed optical services are available across the UK, but coverage varies widely by provider. At Neos Networks, we operate one of the UK’s largest B2B‑only fibre networks, supported by a wide range of third‑party tails to extend reach where required.

    Discover our network reach

  • How long does it take to deliver Dark Fibre and Lit Fibre?

    Delivery times vary depending on location. If the route is on‑net, Dark Fibre delivery typically takes around 30 to 90 days. New builds that require civil works or permits usually take 90 to 180 days, while more complex projects involving wayleave agreements or major construction can take longer.

    Lit Fibre services can often be delivered more quickly where infrastructure is already in place. For example, with Neos Networks rapid activation, up to 100Gbps Optical Wavelengths can be deployed in selected UK data centres and exchanges in as little as 10 business days.

  • Can you migrate from Lit Fibre to Dark Fibre?

    Not usually. With most providers, moving from a managed Lit Fibre service to Dark Fibre requires a new fibre agreement and network design. However, with Neos Networks Optical Wavelengths, Spectrum can act as a stepping stone, giving you greater control over optical capacity before committing to a full Dark Fibre deployment.

    Learn more about Optical Wavelengths and Spectrum

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Optical network vs Ethernet

Optical networking and Ethernet can both deliver high capacity, low latency connectivity. Which is right for your organisation?

Neos Networks | 2 April 2026

Optical Wavelengths

Get ultrafast, low latency optical connectivity

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Defining optical and Ethernet networks

Optical networks

Optical networks send data as pulses of light through fibre optic cables. Unlike traditional networks based on copper cables, fibre supports much higher bandwidths and enables transmission over extremely long distances.

Optical networking also uses Wavelength Division Multiplexing, most commonly Dense Wavelength Division Multiplexing (DWDM). With DWDM, multiple data streams can travel simultaneously on different wavelengths over the same fibre, massively boosting capacity.

As a result, optical networking today underpins global digital infrastructure, from enterprise and metro links to backbone networks and data centre interconnects (DCI).

In this comparison, “optical networks” refers to high capacity, wavelength-based optical services such as Neos Networks Optical Wavelengths.

Ethernet

Ethernet is a wired networking technology that connects devices to networks for fast, reliable data transfer. Originally designed to connect local area networks (LANs) using copper cables, Ethernet has since evolved to support carrier-grade, high-bandwidth services over fibre.

Today, Ethernet is a vital element of business networks, from LANs to wide area and metro networks, linking offices, campuses and data centres.

In this comparison, Ethernet refers to managed Ethernet services, such as Neos Networks Business Ethernet.

Both optical and Ethernet services can provide high capacity connectivity. How do they differ, and which is the better fit for your business?

Optical networks vs Ethernet: key differences

Here’s a breakdown of how Optical Wavelengths differ from Business Ethernet services:

Optical Wavelengths Business Ethernet
Transmission Data carried as light on dedicated wavelengths over fibre Data carried as Ethernet frames across a provider network and delivered over fibre/copper on a standard Ethernet interface
Cables Fibre optic only Copper or fibre, depending on service and speed; fibre for higher capacity services
Network layer Operates at the Physical Layer (Layer 1), providing a dedicated point‑to‑point optical channel Operates at the Data Link Layer (Layer 2), using Ethernet framing and switching
Capacity High capacity, scalable in increments: 10/100/400Gbps+; DWDM enables multiple wavelengths per fibre Scalable bandwidth from 10Mbps to 100Gbps+
Distance Longer distance links (metro, regional, national, backbone, DCI) Local LAN and regional WAN connectivity; longer reach is delivered via the provider’s wider network
Latency Low or ultra-low on dedicated optical paths Low but can vary due to switching and buffering
Resilience High, depending on network design and diverse routing to achieve bespoke resilience levels High, depending on network design; typically run over an MPLS network with self-healing automatic path selection
Management Delivered as a dedicated optical connection; the provider manages the optical line system and endpoints Often delivered as a fully managed service, with monitoring, SLAs and bandwidth control
Uses Point‑to‑point for high capacity, long-distance connectivity, including DCI, backhaul and backbone networks Point‑to‑point, point-to-multipoint, or any-to-any connections for LANs, WANs and metro networks; Ethernet NNIs interconnect carrier or large enterprise networks

 

How scalable are optical and Ethernet networks?

Optical networks are highly scalable because DWDM lets you add multiple high capacity wavelengths on a single fibre. So it’s easy to boost capacity without installing new fibre. For example, Neos Networks Optical Wavelengths can operate at 10Gbps, 100Gbps or 400Gbps+. Adding or upgrading wavelengths at Layer 1 gives you substantial room to grow.

Ethernet is also easy to scale across LANs, WANs and metro networks, letting you increase capacity with demand. Neos Networks Business Ethernet services offer scalable bandwidth from 10Mbps to 100Gbps. Smaller bandwidth upgrades can often be delivered through configuration changes on the provider’s network. For larger upgrades, you may need new CPE if your existing hardware can’t support higher speeds.

In short, optical scaling is about adding or upgrading wavelengths at Layer 1; Ethernet scaling is about raising bandwidth within a managed Layer 2 service. Both scale well, but optical can reach far higher capacities.

Which delivers lower latency, optical or Ethernet services?

Optical wavelength services generally deliver lower latency than Ethernet on the same physical route. A wavelength follows a fixed end‑to‑end optical path, and optical components such as ROADMs and amplifiers add very little delay. So correctly engineered wavelength services can deliver very low, predictable latency.

In contrast, Carrier Ethernet crosses your provider’s switched Layer 2 network. Each switch hop introduces processing and queuing delay, especially under load. Even so, well‑engineered Carrier Ethernet can deliver consistently low latency over both metro and longer distance routes.

For both services, distance is the biggest factor impacting latency. Fibre propagation delay (the time it takes for a light signal to travel through fibre from A to B) is around 5 microseconds per kilometre, so that’s the physical lower limit.

If you need the lowest possible latency, a dedicated optical wavelength is usually the right choice. At Neos Networks, we configure services across our nationwide network with minimal hops to ensure low latency.

How reliable are optical and Ethernet networks?

Optical services are highly reliable for point‑to‑point, high capacity workloads because they use dedicated optical paths over fibre, which is immune to electromagnetic interference (EMI). DWDM line systems can be engineered with route diversity and optical protection. So a wavelength can fail over to an alternative path, maintaining predictable performance for mission‑critical use cases.

Ethernet services can also be highly reliable, depending on your provider’s end-to-end design. For example, Neos Networks Business Ethernet includes MPLS fast re-route and path protection on its core network. At the edge, you can add resilience and diversity options, such as Openreach’s RO2, which delivers dual Ethernet services on physically separate routes to eliminate single points of failure.

At lower speeds, Ethernet may be handed off over copper, which is more susceptible to EMI. But overall service reliability is determined by the provider’s core network and end-to-end resilience strategy.

For both optical and Ethernet services, good providers include stringent uptime and fault repair SLAs to keep you connected.

Are optical networks more secure than Ethernet?

Both optical and high capacity Ethernet services over fibre are highly secure when correctly configured. Fibre carries light, not electrical signals, so it’s harder to tap than traditional copper wires.

And both services provide robust traffic separation. Optical Wavelengths provide the highest isolation at the Physical Layer (Layer 1), giving you a dedicated wavelength – a private optical channel. Business Ethernet uses logical separation at Layer 2 with services such as EPL, EVPL and VPLS on a shared platform.

However, neither optical nor Ethernet services are completely immune to attacks. For sensitive traffic in regulated industries, adding end-to-end encryption is recommended for compliance.

How much do optical and Ethernet services cost?

Optical wavelength services are typically more expensive than Ethernet because you get a dedicated optical channel (wavelength) with fixed, high capacity bandwidth. Costs depend on the capacity (10/100/400Gbps+), circuit distance, and resilience and diversity requirements.

Business Ethernet is generally more cost-effective because it uses shared network infrastructure. Pricing varies by access type (fibre vs copper), bandwidth (10Mbps-100Gbps+), and resilience options such as RO2.

In short, consider optical services if you have specific bandwidth or latency requirements that justify the higher cost. Choose Ethernet for a balance of cost and performance for general enterprise applications such as WAN, SaaS and cloud access.

Ultimately, which is the better fit for your organisation depends on several factors.

Optical vs Ethernet service: which is right for your business?

Here are some key considerations to bear in mind when deciding between Optical Wavelengths or Business Ethernet connectivity:

  1. Use case: What are you trying to connect: two high‑capacity sites, multiple sites, data centres or external networks via NNIs?
  2. Capacity: Do your workloads need fixed 10/100/400Gbps+ bandwidth, or is flexible bandwidth up to 100Gbps enough?
  3. Latency: Do you need the lowest possible latency on a specific route, for example, for real-time applications?
  4. Distance: How far apart are your sites, and does the route length affect your latency or design requirements?
  5. Scaling plans: How much capacity do you expect to need as your organisation and network demands evolve?
  6. Cost constraints: For the network performance you require, do optical or Ethernet services better fit your budget?

Consider Optical Wavelengths if you:

✓ Need dedicated, point‑to‑point connectivity between high capacity sites or data centres.
✓ Want fixed, uncontended bandwidth at 10Gbps, 100Gbps, 400Gbps or higher.
✓ Require predictable low or ultra-low latency on a dedicated, fixed route.
✓ Operate sites that are far apart and need consistent performance over long‑distance fibre routes.
✓ Expect rapid growth and want the ability to scale by adding or upgrading wavelengths at Layer 1.
✓ Can justify the premium for dedicated optical capacity to meet specific critical performance requirements.

Optical Wavelengths

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Consider Business Ethernet if you:

✓ Need to connect multiple offices, branches or campuses across LANs, WANs or metro networks.
✓ Want flexible bandwidth options up to 100Gbps, rather than fixed higher capacity wavelengths.
✓ Require low latency that can vary slightly but supports most common enterprise applications.
✓ Want a local or metro network delivered over a provider’s core, rather than dedicated long‑distance optical paths.
✓ Want a service that can scale quickly as your bandwidth demands increase.
✓ Find high capacity Ethernet gives you the best balance of performance and cost for your budget.

Business Ethernet

Get high capacity, low latency Ethernet

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Not sure which is right for you?

At Neos Networks, we offer a range of high capacity, low latency Optical Wavelength and Business Ethernet services across our UK-wide network. If you want to discuss the best options for your business, get in touch.

Optical network vs Ethernet: FAQs

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What is Dark Fibre and what are its benefits?

Dark Fibre is unused fibre optic cables you can “light” to create your own network. Is it right for your business?

Neos Networks | 5 March 2026

Build your high capacity network aross the UK with Dark Fibre

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What is Dark Fibre?

Dark Fibre, also known as “unlit fibre”, is fibre optic cable that is installed but not in use. It’s called “dark” because it has no light signal passing through it. Network owners lease these unused fibres to organisations so they can build their own private network.

With provider-managed optical services (also known as “lit fibre”), the network operator supplies and manages the optical equipment for you. You get a “plug-and-play” service with a set bandwidth and performance. With Dark Fibre, you lease only the fibre. You install your own equipment at each end and control how the link operates. And you choose the technology, bandwidth and performance level your organisation needs.

So Dark Fibre gives you maximum control and flexibility to design a high capacity network with almost limitless scalability.

Learn more about Dark Fibre vs Lit Fibre

How does Dark Fibre work?

Dark Fibre is unused fibre optic cabling with no data transmission equipment attached. So it’s a physical path, not a service.

Fibre cables contain multiple strands. You lease a specific strand or multiple strands between two fixed network points, such as offices, data centres or network nodes.

Fibre optic cable

Fibre optic cable showing multiple coloured strands that can leased as dark fibre

 

You then install the optical equipment needed to “light” the fibre. That equipment generates the light signals that carry your data.

As it’s your dedicated line, you choose the protocol, data rate, modulation and equipment configuration. Capacity, latency, encryption and overall performance all depend on the equipment you deploy, not provider presets. And with technologies like Dense Wavelength Division Multiplexing (DWDM), you can increase the capacity by running multiple wavelengths on the same strand.

In other words, the provider manages the physical layer: fibre cables, ducts and the physical route. You handle network monitoring, troubleshooting, upgrades and optical power levels.

What are the benefits of Dark Fibre?

The main advantage of Dark Fibre is that you have complete control over your network. Here are the key benefits.

Customisation

Choose your own networking equipment, protocols and specifications to suit your business needs. For example, you can use DWDM to increase the number of channels per fibre.

Scalability

As Dark Fibre is unused optical fibre, it offers almost limitless capacity. You can scale up your bandwidth as your business grows by simply updating the optical hardware.

Low latency

You have exclusive access to your fibre strand, so you’re not competing with others for bandwidth. By choosing the right equipment and network design, you can create low or ultra-low latency connections.

Security

Dark Fibre gives you a private physical connection that isn’t shared with other organisations. You can add your own encryption to meet specific operational or regulatory requirements.

Reliability

You design the network, so you can build in resilience with diverse paths or redundant equipment. And when faults occur, you can diagnose and resolve them immediately without waiting for a provider to troubleshoot.

Cost efficiency

Dark Fibre requires more upfront investment than fully managed optical services. But it can be more cost-effective if you have heavy, long-term data demands because you control usage and upgrades.

However, Dark Fibre has its challenges, and you’ll need to weigh them carefully before taking the plunge.

Dark Fibre challenges

Here’s what to bear in mind if you’re considering Dark Fibre:

  • Upfront capital cost: You need to buy and install all the active optical equipment, such as high capacity transceivers and DWDM systems. Are you ready for this high initial capex?
  • Specialist skills: Running a Dark Fibre network requires significant expertise to select install hardware and manage the network. Do you have the right expertise in-house?
  • Operational responsibility: With Dark Fibre, you operate the entire active layer, including network monitoring, maintenance, troubleshooting and hardware upgrades. Do you have the necessary resources?
  • Route availability: If Dark Fibre isn’t available on an existing route, you’ll need to build, which adds time and cost. Is Dark Fibre available for your planned routes?
  • Resilience strategy: You’ll need to design and implement your own resilience measures, such as diverse routing, failover mechanisms and redundant hardware.

So Dark Fibre gives you unrivalled control, which is ideal for certain use cases. But it’s not the right solution for everyone.

Who is Dark Fibre suitable for?

Dark Fibre can work well if you need secure, high capacity, low latency connectivity and want full control over network performance and design.

Here are some examples of how Dark Fibre is used today.

Industry/sector Example use case
Hyperscalers and cloud providers High capacity data centre interconnects (DCI) to transfer large volumes of traffic across core networks and cloud regions
Network service providers ISPs using Dark Fibre for new access, backhaul or metro routes, and carriers expanding reach or adding specialised optical services
Government and public sector NHS trusts handling large volumes of clinical images and patient data, and government bodies delivering public services
Financial services Banks and trading firms requiring low latency links for real-time trading and private, deterministic site-to-site connectivity
Large enterprises High capacity links between sites, supporting data replication, private cloud, AI and IoT
Broadcast and media Real-time transfer of uncompressed 4K content between studios, production facilities and data centres
Research and education Research centres running data-heavy workloads and universities transferring data between labs and high-performance computing clusters

 

How much does Dark Fibre cost in the UK?

The total cost of Dark Fibre varies widely depending on the provider, location, route availability and the optical equipment you need for your network.

First, leasing strands on-net, where fibre already exists, is far cheaper than commissioning off-net build work. And if you need to build off-net, costs may vary significantly between urban, suburban and rural areas because civil works and permissions are major cost drivers.

Second, you need to buy your own optical equipment, such as transceivers, DWDM systems, amplifiers and related hardware. High capacity DWDM can significantly increase your upfront capex.

Third, you need to factor in the staff costs of deploying and running the network. With Dark Fibre, you manage network monitoring, maintenance, troubleshooting and upgrades, which all adds to ongoing operational costs.

Fourth, Dark Fibre attracts business rates, also known as “fibre tax”, but only once the fibre is lit. These annual charges, levied by local authorities per connection, add to your ongoing network costs.

Finally, the contract type matters. An IRU (Indefeasible Right of Use) is a long‑term right to use specific fibre pairs, bought upfront as a one‑off capital purchase. That means higher initial capex but lower annualised costs. In contrast, an annual lease cuts the upfront spend but can cost more across the term due to recurring annual charges.

Given these factors, is Dark Fibre worth the investment for your organisation?

Is Dark Fibre worth it?

Dark Fibre can make financial sense if you need total control over your network, your bandwidth and your budget.

Consider Dark Fibre if you:

 ✓ Expect significant long-term bandwidth growth: Scaling Dark Fibre via equipment upgrades can be more cost-efficient than buying increasingly high capacity lit services.
 ✓ Need predictable low latency: You get full control to minimise latency for real-time applications like data centre interconnects, financial trading, AI and IIoT.
✓ Have in-house optical expertise: Without the skills to deploy and maintain your network, the operational burden can outweigh the benefits.
✓ Need a private, isolated network: You can apply your own encryption to meet security and compliance needs in regulated industries such as healthcare and finance.
✓ Can make maximum use of the fibre: The more capacity you use, the lower the cost per bit over time.
✓ Have key sites already on-net: If most of your routes are off-net, the build costs could be significantly higher.

 

To assess the business case for Dark Fibre, you’ll need to:

  • Estimate long-term bandwidth and latency requirements.
  • Evaluate your internal capability to run the network.
  • Consider any industry-specific privacy and security measures for compliance.
  • Check whether key sites are on-net with your chosen provider.

If you think you’ve got a case for Dark Fibre, the next step is availability. Where can you get it?

Where is Dark Fibre available in the UK?

Dark Fibre is generally available across national backbone and regional backhaul networks, but coverage depends on where there are spare fibre strands.

Spare fibre exists across the UK. The London area, Manchester and other major urban corridors have the largest Dark Fibre footprints because they have long-established fibre networks and high capacity demand.

However, availability varies by provider. Some operators have large national networks with many routes on-net. Others rely mainly on third-party tails or new build work to extend their reach.

At Neos Networks, we operate one of the UK’s largest, business-only fibre networks, with extensive national, regional and metro Dark Fibre routes.

Dark Fibre solutions for your business

If you’re looking for a UK Dark Fibre solution, we can help. With our UK-wide network and wide range of third-party tails, we specialise in serving hard-to-reach areas. Download our network map to check our nationwide reach.

Our experts work with you to map the optimal route, overcome challenges and plan for growth. Whether you need a flexible, short-term lease or a 25-year IRU, we design the best solution for you and your budget.

Build your high capacity network aross the UK with Dark Fibre

Learn more

Want to talk to one of our Dark Fibre experts? Get in touch. We’ll be happy to make Dark Fibre work for your organisation.

Dark Fibre: FAQs

  • Who owns Dark Fibre?

    Dark Fibre can be owned by telecom providers, ISPs or large enterprises that have built their own fibre infrastructure. Typically, network operators own the fibre and lease unused strands to businesses so they can build and run private optical networks.

  • How does Dark Fibre differ from lit fibre services?

    Dark Fibre is unused fibre optic cable that you lease or buy and then light with your own equipment to create a private network. In contrast, lit fibre refers to fibre optic cable carrying a managed service such as Optical Wavelengths or Business Ethernet, with the network provider responsible for operating and maintaining the service.

    Learn more about Dark Fibre vs Lit Fibre

  • Is Dark Fibre the same as a leased line?

    No. Unlike Dark Fibre, a leased line is a managed service, often delivered as Dedicated Internet Access (DIA), where the provider supplies the equipment, defines the bandwidth and manages the connection end to end. At Neos Networks, we offer both “wires only” and managed DIA services with scalable bandwidth from 10Mbps to 10Gbps.

  • Can Dark Fibre connect multiple sites, or only single point‑to‑point routes?

    Dark Fibre is typically delivered as point‑to‑point links between locations. However, you can combine these links to build more complex topologies. Because you design and manage the network, you can create ring, mesh or hub‑and‑spoke architectures to connect multiple sites.

  • How fast is Dark Fibre?

    Speeds on Dark Fibre are only limited by the equipment you deploy and the capability of the fibre. In practice, this can range from around 1Gbps to hundreds of gigabits or even terabit-scale capacity, depending on your network design.

  • What are the advantages of using Dark Fibre?

    Dark Fibre gives you full control over how your network is designed, operated and scaled. You define routing, capacity and security. It also provides effectively unlimited capacity, so you can increase bandwidth over time without changing the underlying infrastructure.

  • What challenges does a Dark Fibre rollout present?

    Dark Fibre gives you more control, but that comes with greater responsibility. You’ll need the right expertise and equipment in place, and deployment timelines can vary depending on route complexity, civil works and wayleave agreements. Dark Fibre also involves greater upfront investment and some additional ongoing costs, such as business rates (fibre tax).

  • Who typically uses Dark Fibre?

    Dark Fibre is most commonly used by hyperscalers, network operators, wholesale providers and large enterprises that need full control over their connectivity. However, it can suit organisations of any size with specialist networking, compliance or performance requirements.

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DIA vs Ethernet

Dedicated Internet Access (DIA) and Ethernet both offer enterprise-grade, high capacity connectivity. Which is right for your business?

Neos Networks | 25 February 2026

Dedicated Internet Access (DIA)

Private, high-speed internet for your business

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What is DIA?

Dedicated Internet Access (DIA) is a private, uncontended internet connection between your premises and your internet service provider (ISP). Unlike business broadband, which is a shared service, DIA gives you bandwidth reserved for your organisation alone. That means your network performance stays consistent, even during peak periods.

Learn more about DIA vs business broadband

With symmetrical upload and download speeds, DIA provides reliable connectivity for real-time cloud, VoIP and SaaS applications. For example, Neos Networks Dedicated Internet Access (DIA) offers upload/download speeds you can scale from 10Mbps to 10Gbps.

What is Ethernet?

Ethernet is a wired networking technology that connects devices to local area networks (LANs) for fast, reliable data transfer. But in this context, we’re talking about high capacity connectivity services like Neos Networks Business Ethernet.

Business Ethernet services give you private, fixed-bandwidth connectivity between your sites or between sites and data centres or cloud services. Options include point-to-point, point-to-multipoint or any-to-any connectivity. And for network service providers and large enterprises, Ethernet network-to-network interfaces (NNIs) allow you to connect to other networks and extend your reach.

Like DIA, Ethernet services are uncontended, with guaranteed bandwidth and symmetrical upload/download speed. In fact, DIA is often delivered over an Ethernet access network.

The main difference is that DIA is just a private connection to the internet. In contrast, Business Ethernet provides high-bandwidth site-to-site, site-to-cloud or network-to-network connectivity without routing traffic across the public internet.

DIA vs Ethernet: key differences

Here’s a summary of how DIA services differ from Business Ethernet:

Dedicated Internet Access (DIA) Ethernet
Purpose Private, uncontended connection to the public internet Private Layer 2 connectivity between sites and data centres or cloud endpoints, as well as NNIs
Delivery Often delivered over Ethernet access; connects to the internet via your ISP’s network End‑to‑end private connectivity with no internet breakout unless you design it in
Bandwidth Guaranteed, typically 10Mbps-10Gbps, with symmetrical upload/download speeds Guaranteed, typically 10Mbps-100Gbps, with symmetrical upload/download speeds
Scalability Capacity limited to 10Gbps on the DIA bearer and the available access technology Highly scalable, with bearer options up to 100Gbps and flexible topologies for multi-site expansion
Uses Consistent, high-speed internet access for real-time cloud, SaaS and VoIP services High capacity site‑to‑site, site‑to‑cloud or network-to-network private connections
Topology Single connection per site to the ISP Point‑to‑point, point‑to‑multipoint, hub‑and‑spoke or any‑to‑any
Resilience SLA‑backed uptime and fix times; avoids the “best efforts” support model used by shared broadband services Private network with SLA‑backed availability and performance
Security Traffic crosses the public‑internet, so relies on firewalls, DDoS protection and other security measures Traffic stays off the public internet, reducing exposure and risk
Cost A dedicated line, so higher than business broadband; cost depends on provider, bandwidth and location Typically similar to DIA; cost depends on provider, bandwidth, distance and topology; often cheaper than DIA for higher bandwidths

 

Which is faster: DIA or Ethernet?

DIA offers bandwidths from 10Mbps to 10Gbps. Ethernet can go much higher: most managed Business Ethernet services can scale to 100Gbps, depending on the provider. Higher Ethernet rates exist but are mainly used in specialist carrier and data centre environments.

Both DIA and Ethernet give you dedicated bandwidth reserved for your business, so you get the full rate you purchase. And both offer symmetrical upload/download speeds.

However, end-to-end performance differs. Ethernet provides private Layer 2 connectivity between two endpoints (site-to-site or network-to-network). Traffic remains within the provider’s network unless you add an internet connection. By contrast, DIA is a direct connection to the public internet, so real-world throughput can be affected by internet routing and congestion.

Similarly, Ethernet usually delivers more consistently low latency and jitter because traffic stays on the provider’s private network. DIA latency is often stable on the access network, but it can vary depending on internet traffic.

In short, DIA is great for high-speed internet access up to 10Gbps, though actual speeds may vary slightly beyond your circuit. Ethernet is better when you need a private network with higher capacities and more consistently low latency.

How resilient are DIA and Ethernet?

Both DIA and Ethernet are highly resilient. Unlike the “best efforts” support offered by shared business broadband services, both typically include SLAs for uptime and fault repair times.

Trusted providers offer a resilient core network for both DIA and Ethernet. For example, Neos Networks DIA is supported by a meshed MPLS backbone with multiple upstream transit and peering partners to ensure service continuity. Ethernet by default stays on the provider’s controlled core network.

Beyond the core, DIA resilience may vary with the access tail. For example, FTTP/FTTC-based tails support lower bandwidths and depend on shared access infrastructure. However, if delivered over full fibre Ethernet tails, DIA can support last-mile resilience and diversity options, such as RO2.

Ethernet also supports diverse fibre routes, separacy and RO2 dual‑path engineering by design. In addition, Ethernet offers flexible topologies (point-to-point, point-to-multipoint, etc), so building in resilience at scale is easier, especially for multisite networks.

So DIA offers good resilience per site and reliable internet access for cloud and SaaS traffic. Ethernet is better for consistently resilient site-to-site connectivity across multiple locations.

How secure are DIA and Ethernet?

Both DIA and Ethernet offer stronger security than business broadband because they run over dedicated connections rather than shared public paths. But they differ in their exposure to attacks and risk.

DIA is a private circuit but connects to the public internet, so protection ultimately depends on your security stack: firewalls, traffic filtering and DDoS protection. That's why at Neos Networks we offer tiered DDoS Mitigation for DIA to suit your risk profile.

With Ethernet, traffic stays on the provider’s private domain (unless you design an internet breakout), reducing the external attack surface and exposure to threats. Security can be further hardened by using virtual local area networks (VLANs) to isolate sensitive traffic.

So DIA delivers secure internet access, as long as you have the right security controls in place. Ethernet offers stronger inherent isolation, giving you more controlled end-to-end security across every connected site.

How much do DIA and Ethernet cost?

As DIA and Ethernet use the same underlying fibre infrastructure, they often cost roughly the same at standard bandwidths. In the UK, prices typically start from a few hundred pounds a month, depending on the provider, bandwidth and configuration.

If new fibre is needed to reach your premises, both services may incur Excess Construction Charges (ECCs). And for certain Ethernet configurations, such as point-to-point (P2P) links, costs can rise significantly with the distance between two sites. That can make Ethernet more expensive than DIA for equivalent bandwidths.

In short, DIA and Ethernet costs vary widely based on bandwidth, distance, location and topology. You’ll need to weigh which option best fits your needs and budget.

Should you choose DIA or Ethernet for multi-site organisations?

Dedicated Internet Access can be a good fit for smaller multi-site organisations if most of your business traffic goes to SaaS, cloud services or the public internet. With DIA, you get guaranteed, symmetrical upload and download bandwidth up to 10Gbps and avoid routing everything back through a central HQ or data centre.

However, if you’re a larger organisation and most of your traffic flows between your sites or data centres, Business Ethernet may be the better choice. It gives you predictable low latency, higher capacity options up to 100Gbps and a private Layer 2 environment to build secure any-to-any connectivity, such as VPLS, to protect highly sensitive data.

A third option is hybrid: use Ethernet for your core network and DIA for your branch offices. If you want maximum flexibility, SD‑WAN can help route traffic intelligently across DIA, Ethernet and other access types while providing efficient direct access to cloud services.

DIA vs Ethernet: which is right for your business?

So, whether Dedicated Internet Access or Business Ethernet is right for your organisation depends on several factors, including:

  1. Organisation size: Are you a small business with one or two sites or a large, multi-site organisation?
  2. Traffic flows: Does your traffic mainly go to the internet and cloud services or between your sites?
  3. Bandwidth needs: Is 10Gbps enough, or do you need to scale to 100Gbps+?
  4. Performance demands: Can your applications tolerate internet variations in latency and jitter?
  5. Data sensitivity: Do you handle highly sensitive data that needs to stay off the public internet?
  6. Resilience needs: Do you need simple access-level resilience or end-to-end diversity across multiple sites?
  7. Scaling plans: Will you grow by adding per-site DIA links, or do you need a more flexible, multi-site topology?
  8. Cost constraints: For the network architecture, performance and scalability you require, does DIA or Ethernet better fit your budget?

Choose DIA if you:

✓ Are a smaller organisation one or a few sites that need direct access to the internet
✓ Rely mainly on SaaS, cloud or internet services
✓ Need reliable, uncontended, symmetrical bandwidth up to 10Gbps
✓ Want high performance but can tolerate some variability in latency and jitter
✓ Can secure your data across the public internet with firewalls, filtering and DDoS protection
✓ Can meet your resilience needs with SLA‑backed uptime and optional diverse access tails when available
✓ Want fast deployment and a simple way to add sites to your network

Learn more about Dedicated Internet Access

Download brochure

 

Choose Business Ethernet if you:

✓ Are a medium or large organisation that needs private connectivity across multiple sites
✓ Rely on high capacity site‑to‑site or data centre links
✓ Need reliable, symmetrical bandwidth from 10Gbps up to 100Gbps and beyond
✓ Require consistently low latency and jitter for critical applications
✓ Manage highly sensitive or regulated data that must stay off the public internet
✓ Need coordinated resilience across sites, including guaranteed diverse routing such as RO2
✓ Want a flexible, scalable multi‑site topology you can expand as you grow

Learn more about high capacity Business Ethernet

Download brochure

 

Not sure which is right for you?

At Neos Networks, we offer a range of high capacity, low latency business connectivity across our UK-wide network, including DIA, Business Ethernet, SD-WAN, Optical Wavelengths and Dark Fibre. If you want to discuss the best connectivity options for your business, talk to one of our experts.

We’ll be happy to make connectivity work for you.

DIA vs Ethernet: FAQs

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What is optical networking?

Optical networking underpins today's digital infrastructure, from enterprise networks to the global internet. Is optical connectivity right for your business?

Neos Networks | 11 February 2026

Get ultrafast, low latency Optical Wavelengths

Learn more

 

What is optical networking?

Optical networking is a data-transfer technology that uses pulses of light to transmit data. Instead of electrical signals travelling over copper wires, data is carried as optical signals through fibre optic cables. This delivers far higher bandwidth than traditional copper-wire networks and allows data to be transmitted over extremely long distances.

Light travelling in a fibre optic cable: the light reflects at the core/cladding interface, a process known as total internal reflection

How optical networking works: diagram showing a light ray in a fibre optic cable reflected at the interface between the glass core and the cladding (total internal reflection) back into and along the cable

 

Optical fibre underpins modern IT networks, from high-bandwidth enterprise links to backbone networks, data centre interconnects (DCI) and 5G mobile backhaul. Starting at 10Gbps for standard enterprise needs, optical networks scale up to 100Gbps or 400Gbps for DCI and backbone networks, with hyperscalers now transitioning to 800Gbps and 1.6Tbps.

From local enterprise and metro networks to national and international links, optical networking forms the backbone of today’s internet and telecoms infrastructure.

How do optical networks work?

In simple terms, network equipment converts electrical data into optical signals, which are sent as pulses of light through fibre cables. At the far end, receivers convert the optical signal back into an electrical signal for processing.

To increase capacity, optical networks use Wavelength Division Multiplexing (WDM), most commonly Dense Wavelength Division Multiplexing (DWDM). DWDM allows multiple data streams to travel simultaneously over a single fibre, each carried on a different optical wavelength (colour of light). At one end, a multiplexer combines these wavelengths. At the receiving end, a demultiplexer separates them into individual data streams.

Over long distances, light signals gradually lose power and can become unreadable. To prevent this, optical amplifiers are widely used to amplify many DWDM channels simultaneously, extending reach between regeneration points.

To steer the signal, reconfigurable optical add‑drop multiplexers (ROADMs) can direct any wavelength to any output port. This means you can remotely add or drop signals, or allow them to pass through, at different sites. So you can create a flexible, mesh-based optical network without manually reconfiguring intermediate nodes.

For longer distances and higher capacities, optical networks rely on coherent optics combined with digital signal processing (DSP). By encoding and recovering more information from each wavelength, these technologies maximise both the reach and efficiency of DWDM networks.

Finally, Optical Transport Network (OTN) is commonly used at the transport layer. Standardised by ITU-T G.709, OTN “wraps” different types of traffic (IP, Ethernet, etc) into a managed frame, improving resilience and efficiency for long-distance transport.

Let’s look at some of the key components optical networks rely on.

Optical networking components

Optical fibre cables

An optical fibre cable is constructed from bundles of individual optical fibres. Each one has a core, typically made of glass, through which the light travels. Wrapped around the core is glass or plastic cladding, which prevents the light from escaping. Outer coatings protect the cable from physical damage.

Cross-section of a fibre optic cable

Cross-section of a fibre optic cable, the basic medium of optical networks, showing the glass core, cladding and various outer coatings

 

Most modern networks use single-mode fibre, which supports extremely high-bandwidth, long-distance transmission with low attenuation (signal loss). For short-distance connections, such as within a data centre building, thicker multi-mode cables are used.

Transmitters and receivers (transceivers)

Transmitters use a laser or LED light source to convert the electrical signals into light pulses to send data. At the receiving end, a photodiode receiver converts the signals back into electrical signals. Today, the standard solution is to use transceivers, a compact network device combining both functions: sending and receiving data.

Multiplexers and demultiplexers

To expand network capacity, multiplexers (also known as muxes) combine multiple optical signals onto a single fibre. At the destination, demultiplexers (demuxes) separate them again. A vital component in DWDM and CWDM networks, they enable a dramatic increase in the capacity of existing fibre infrastructure without laying additional cables.

ROADMs

In modern DWDM networks, advanced multiplexers called ROADMs dynamically manage multiple wavelengths to enable flexible routing and rapid reconfiguration. Within a ROADM, wavelength selective switches (WSS) can switch incoming optical signals to different output ports based on their wavelength. This allows you to reconfigure optical paths as needed remotely.

ROADM WSS basic function

Functional diagram showing how a ROADM wavelength selective switch (WSS) separates incoming signals into individual wavelengths and reroutes them to multiple output fibres

 

Optical amplifiers

As wavelengths degrade over long distances, amplifiers can be used to boost the optical signal without converting it back into electrical form. The most commonly used are erbium‑doped fibre amplifiers (EDFAs), which are typically placed every 70-100km on the network. Together with coherent transceivers and ROADMs, amplification enables multi‑span links from hundreds to thousands of kilometres.

Optical fibre vs copper networks

By using light rather than electrical signals, fibre networks provide higher bandwidth and lower latency over longer distances than traditional copper-based networks. Here’s a summary of how they differ.

Optical fibre vs copper networks

Optical fibre Copper
Transmission Light signals Electrical signals
Bandwidth Commonly 10/40/100/400Gbps per link, with aggregate capacity scaling to multiple terabits per second Typically up to 10Gbps over twisted-pair (Cat6A) cabling; higher using very short direct-attach copper (DAC) cabling
Distance Up to 70-100km per span on single-mode fibre without amplification; hundreds to thousands of kilometres with multi-span amplification Up to around 100m at rated speeds for twisted-pair Ethernet; DAC links are limited to a few metres
Interference Immune to electromagnetic interference (EMI) and radio frequency interference Susceptible to EMI and radio frequency interference
Latency Consistently low latency over long distances due to optical amplification and fewer active regenerations Increases over long distances because electrical signals need more frequent regeneration
Security No electromagnetic signals, so interception is significantly more difficult Electromagnetic signals can potentially be intercepted, so tapping is easier
Uses High capacity, long‑distance connectivity such as access, metro and backbone networks, data centre interconnect and mobile backhaul Short‑distance connectivity such as Ethernet LANs, legacy access networks and device connections

 

Benefits of optical networks

Optical fibre networks offer several advantages for your business, particularly compared to traditional copper-based networks. Benefits include:

  • High capacity: Delivers bandwidths from 10Gbps up to 400/800Gbps, with cutting-edge coherent optics now enabling 1.6Tbps per wavelength.
  • Low latency: Consistently low or ultra-low latency supports real-time applications like cloud services, AI, 5G and IoT.
  • Easy scalability: Quickly scale capacity by adding new wavelengths through DWDM.
  • Enhanced security: Light transmission is harder to intercept than electrical signals, improving data confidentiality.
  • Long-term cost: Wavelength-based scaling and reduced maintenance can deliver lower long-term operational costs

Despite the advantages, choosing the right optical architecture for your organisation can be challenging. Let’s consider the different types of optical networks.

Types of optical networks

Optical fibre networks can be broadly classified by their scale and the technologies they use. Among the most common are:

  • Long-haul backbone networks: From nationwide links to international subsea cables, long-haul optical networks form the backbone of global communications. Typically operated by wholesale carriers and hyperscalers, they use DWDM, coherent optics and amplification to maintain high bandwidths over very long distances.
  • Metro networks: Metro networks interconnect points of presence (PoPs) in cities or large urban regions, aggregating traffic between long-haul and access layers. Increasingly DWDM-based, metro networks often use Metro Ethernet and cover distances around 10-100km or more.
  • Data centre interconnect (DCI): DCI links connect data centres, from short cross‑campus connections to wider metro or regional routes. Optimised for high bandwidth, low latency and reliability, they often use DWDM and high-speed Ethernet (100-800Gbps). Data centre operators may opt for Dark Fibre for maximum control or managed optical wavelengths for simpler scaling.
  • Access networks: Also known as the last mile, access networks connect end users or subscribers to their service provider’s core network. They may be active optical networks (AONs), which use powered equipment and deliver dedicated point-to-point links. In the UK, examples include Openreach EAD and OSA tails for Ethernet and Optical Wavelengths. In contrast, passive optical networks (PONs) provide point-to-multipoint links to multiple subscribers, such as fibre-to-the-premises business broadband.

The above network layers aren’t mutually exclusive. Organisations often use more than one. If you’re considering high capacity optical connectivity, you’ll need to choose the right service model for your business.

Providers typically offer a range of options, depending on how much control you want over your network:

  • Wavelength services: A fully managed optical service, like our Optical Wavelengths, where the provider delivers a single wavelength with a fixed capacity (e.g. 10Gbps, 100Gbps or 400Gbps). You don’t manage any optical equipment – just plug in and go.
  • Spectrum services: You lease a block of optical spectrum (e.g. 75GHz) and can light it with your own transponders (or use the provider’s equipment). This gives you more control than a wavelength service with less complexity than managing an entire fibre. It can be a cost-effective stepping stone to Dark Fibre.
  • Managed Optical Fibre Networks (MOFN): Either you or the provider owns and manages the DWDM line system and transponders, depending on the setup. However, the provider typically manages the service, network operations and maintenance.
  • Dark Fibre: You lease the entire fibre strand and manage everything end to end, including the optical equipment and signal transmission. It gives you maximum control with almost limitless scalability.

When choosing your model, you’ll need to consider your current and long-term use cases.

Optical networking use cases

Optical connectivity plays a critical role in various sectors. Here are some examples of real-world applications:

Industry/sector Example uses
Data centre interconnect (DCI) Linking data centres for real-time data replication, disaster recovery and fast scaling for cloud, AI and high-performance computing (HPC)
Enterprise WAN Connecting dispersed business sites and data centres with high-bandwidth, low latency links
Wholesale telecoms Delivering regional and national backhaul for mobile operators, ISPs and altnets
AI and cloud services Providing high-bandwidth connectivity for AI training, inference and hybrid or multi-cloud environments
Long-haul backbone networks Supporting hyperscale cloud services and global enterprise applications
Financial services Providing ultra-low latency links for real-time market data, trading and synchronous data replication
Media and broadcast Delivering high-bandwidth, ultra-low latency links for live broadcasts and uncompressed video transport
Manufacturing and IIoT Providing high‑bandwidth, low‑latency connectivity for sensor data, analytics and plant automation

 

Whatever your use case, you’ll want a network you can scale as your data demands evolve.

How scalable are optical networks?

Modern optical networks are highly scalable in both capacity and reach.

To increase bandwidth, you can add more wavelengths or use the optical spectrum more efficiently. Flexible-grid DWDM lets you pack in wavelengths more densely. Coherent optical technology boosts the data rate per wavelength. And coherent pluggable modules, such as 400ZR, make it easy to boost capacity without installing new fibre.

Similarly, you can extend network reach with optical amplification and digital signal processing (DSP). EDFA and Raman amplifiers boost signals across regional and long‑haul routes, including subsea cables. Coherent DSP compensates for signal degradation, enabling high-speed data transfer over hundreds or thousands of kilometres. And with ROADMs, you can expand your network flexibly without manually reconfiguring individual nodes.

For example, our managed Optical Wavelengths services allow you to easily scale up to 400Gbps (or higher on request) across our high capacity, UK-wide fibre network. If you need more control and maximum scalability, Dark Fibre gives you almost limitless capacity and flexibility.

Optical networking solutions

At Neos Networks, we design optical networks to meet your unique business and scale as you grow. With scalable bandwidth from 10Gbps to 400Gbps across the UK, you can connect your organisation nationwide to meet the growing data demands of AI, 5G and IoT.

If you want to discuss if optical connectivity is right for your organisation, get in touch. Or download our Optical Wavelengths brochure to find out more.

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Optical networking: FAQs

  • How do optical networks support AI workloads and high-performance computing (HPC)?

    Optical networks provide the high capacity, low latency transport needed to keep distributed GPU clusters synchronised for AI and HPC workloads. Consistent, predictable performance keeps data moving smoothly between nodes, which is essential for large-scale training and real-time inference.

  • What’s the difference between DWDM and CWDM?

    DWDM packs many tightly spaced wavelengths onto a fibre, delivering high capacity over long distances with optical amplification. CWDM uses wider wavelength spacing and supports fewer channels over shorter distances – a simpler, lower-cost option for metro and enterprise networks.

  • What’s the difference between single-mode fibre (SMF) and multi-mode fibre (MMF)?

    The main difference between SMF and MMF is the core diameter and how they transmit light. SMF has a very small core (around 9µm) and carries a single light path, so it supports long-distance transmission with minimal dispersion. In contrast, MMF has a larger core (typically 50µm or 62.5µm) and supports multiple light paths. As a result, dispersion increases, limiting MMF to short-distance links such as local area networks and building-to-building connections.

  • What are coherent pluggable modules?

    Coherent pluggable modules are optical transceivers that integrate high-speed optics and digital signal processing (DSP) into a single, compact unit to transmit data over long distances. Because they plug directly into compatible switches and routers, you can scale from 100Gbps to 400Gbps or higher by upgrading modules, provided the host equipment supports it. This removes the need for bulky external hardware, reducing power use and saving rack space as you scale.

  • How secure are optical networks?

    Optical networks are inherently secure because data is transmitted as light within sealed fibre cables, requiring physical access to intercept. Additional measures such as secure network design and encryption further protect sensitive data.

  • What makes an optical network resilient?

    Resilience in optical networks comes from features like diverse fibre routes, automatic failover and redundant hardware, so traffic can be rerouted quickly if a fault occurs. Careful network design ensures no single point of failure, helping maintain service continuity even during outages.

What is 400G optical networking?

Learn how 400G optical connectivity can help you meet the rapidly growing data demands of AI, 5G and IoT. Does your business need 400G?

Neos Networks | 30 January 2026

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What is 400G?

400G is optical networking technology that can transfer data at speeds of up to 400 gigabits per second on a single optical wavelength. It provides high-capacity bandwidth to support data-hungry use cases such as data centre interconnects, AI, 5G and IoT.

The terms 400G, 400Gbps and 400GE/400Gbe are sometimes used interchangeably, but they’re not the same:

  • 400G refers to optical transport that delivers 400Gbps capacity on one wavelength.
  • 400Gbps is the data transfer rate of these networks – 400 billion bits every second.
  • 400GE or 400GbE (400Gb Ethernet) is an Ethernet standard set by IEEE 802.3bs and used to connect switches, routers and servers at 400Gbps.

How does 400G work?

400G uses advanced modulation techniques to increase the amount of data carried over optical fibre. The technology you use depends on the distance and application:

  • For short to medium reach, PAM4 modules are common. PAM4 uses four amplitude levels to double the bits per symbol. This supports 400G over distances ranging from hundreds of metres to several kilometres, depending on the optics and fibre type.
  • For metro and long‑haul transport, 400G uses coherent optical Coherent transceivers apply formats such as QPSK or QAM and digital signal processing (DSP) to maintain clear signals over long distances.

As a result, 400G wavelengths can carry one 400GbE service or multiple lower-rate channels, depending on how they're deployed.

400G optical wavelengths

400G optical wavelength carrying either 4 x 100GbE or 400GbE

 

What standards define 400G?

No single standard defines 400G end to end. Instead, it’s based on a set of Ethernet, coherent optical and transport standards that work together. Here are some common standards in use today – a far from exhaustive list.

IEEE 802.3bs defines 400 Gigabit Ethernet (400GbE). It’s the client interface used on routers and switches to deliver 400Gbps services.

For coherent optical connectivity, OIF 400ZR specifies how to carry 400GbE traffic over DWDM fibre for data centre interconnects up to around 120km using amplified links. Building on that, OpenZR+ extends the range for longer metro and regional distances, supporting flexible bandwidths (commonly 100/200/400Gbps) up to several hundred kilometres or more.

To carry these signals reliably across networks, ITU-T G.709 (OTN) defines how client traffic like 400GbE is packaged, combined and monitored end to end, ensuring carrier-grade performance.

Together, these standards make 400G practical, scalable and interoperable across diverse network environments.

What challenges does 400G solve?

Emerging technologies like AI, 5G and IoT are fuelling unprecedented data growth. Coherent optical wavelengths, scalable from 100Gbps to 1.6Tbps, let you scale to meet this ever-growing demand.

Because 400G delivers more capacity per wavelength, you can simplify network design and cut costs. For example, one 400Gbps port costs less per bit than four 100Gbps ports and consumes considerably less power – one of several benefits of 400G.

What are the benefits of 400G wavelengths?

Deploying 400G wavelengths has several potential advantages for your network, including

  • High capacity: Bandwidth up to 400Gbps is ideal for core networks supporting 4K video streaming, AI, 5G and IoT.
  • Efficiency: Compared to aggregating multiple 100G links, 400G coherent optics reduce capex and use fewer router ports.
  • Energy saving: Consolidating traffic reduces power use and cooling needs, cutting your energy bills.
  • Scalability: 400G ZR and ZR+ coherent pluggable optics support flexible data rates (100/200/400G) and make it easy to extend DCI and metro networks.
  • Simplicity: With fewer ports, interfaces and fibre links for a given capacity, 400G reduces network complexity.

With managed 400G services, your provider operates and monitors the optical layer end to end. So you can scale up to 400G as you grow without the complexity or cost of managing the transport layer.

Who are 400G optical networks suitable for?

Global data demand is rising relentlessly, but not every business needs 400G today. It’s suitable for organisations that need to transmit huge volumes of data with low latency and high reliability.

Here are some industries and sectors that can benefit from 400G right now.

400G optical networks – typical applications

Industry/sector Example use case
Telecoms providers Core networks, 5G backhaul and edge networking to support increasingly digital lifestyles
Hyperscalers and AI data centres Data centre interconnect (DCI), cloud computing, and AI inference and training
Media companies Live 4K video streaming and content distribution
Financial services High-frequency trading and real-time transaction processing
Manufacturing Real-time control of industrial operations via the Industrial Internet of Things (IIoT)
Healthcare organisations Sharing medical images, patient records and research data

 

400G optical solutions for your business

If you think 400Gbps optical connectivity might work for you, we can help. At Neos Networks, we design our optical networking solutions to meet your unique business needs now and in the future.

Extend your reach using our high capacity, low latency UK-wide network built for Critical National Infrastructure. With Neos Networks Optical Wavelengths, you get:

  • Flexibility: Optical services scalable from 10Gbps to 100Gbps or 400Gbps, with options for multiple services between your sites
  • Nationwide availability: Connect from up to 400+ exchanges and 90+ data centres across the UK
  • Reliability: Robust, ultra-high bandwidth data transfer using the latest ROADM and DWDM technology with stringent uptime SLAs
  • Route diversity: On-net and off-net routing tailored to your business for maximum resilience
  • Low latency: Network engineered with the shortest hops for low or ultra-low latency

To find out more and discuss which optical solutions are right for you, get in touch. We’ll be happy to make optical connectivity work for your business.

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400G optical networks: FAQs

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VPLS networks explained

VPLS is a type of virtual private network that securely links multiple sites in a single domain. Could it benefit your business?

Neos Networks | 12 January 2026

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What is VPLS?

VPLS (Virtual Private LAN Service) is a virtual private network (VPN) that links multiple sites into a single Ethernet-based domain. It connects dispersed local area networks (LANs) into one secure, high-speed wide area network (WAN), so your remote offices act as if they share the same local network.

VPLS provides any-to-any connectivity: each site connects directly to every other site. For example, here’s Neos Networks VPLS, which leverages our high capacity, UK-wide core network:

Neos Networks VPLS

Neos Networks EPL, an Ethernet point-to-point service, showing a dedicated Ethernet link between two customer premises via the Neos Networks backbone and third-party access networks.

 

How does VPLS work?

VPLS emulates the functionality of a traditional Ethernet LAN, making distant locations behave as if they’re on the same LAN. It typically runs over your provider’s MPLS backbone, which ensures predictable paths and low latency.

The service learns MAC addresses and works like a large virtual switch, forwarding traffic to the correct destination. Every site can talk to every other one on the network without routing through a central hub, reducing latency and improving resilience.

What’s the difference between VPLS and MPLS?

The key difference between VPLS and MPLS is that MPLS is the underlying transport technology, while VPLS is a service built on top of it to extend LAN functionality:

  • MPLS operates between Layer 2 and Layer 3 of the OSI model. It uses labels to route IP packets and supports advanced Quality of Service (QoS) and traffic engineering.
  • VPLS works at Layer 2. It acts like a giant Ethernet switch across all your sites, forwarding traffic to the right destination.

MPLS Layer 3 VPNs typically use point-to-point (P2P) or hub-and-spoke design, and they don’t forward Ethernet broadcast or multicast traffic by default.

By contrast, VPLS uses pseudowires (virtual connections) to create an any-to-any network, forwarding Ethernet traffic like a LAN – ideal for business applications such as voice and video.

In short, MPLS can work well if you need granular IP routing, traffic engineering and advanced QoS across a WAN. VPLS is better if you simply want to extend your Ethernet LAN seamlessly across your sites without moving to a Layer 3 architecture.

But what if you need to combine Ethernet with other connection types?

VPLS vs SD-WAN

Both VPLS and SD-WAN connect multiple sites, but SD-WAN gives you more flexibility:

  • VPLS extends your Ethernet LAN across your sites, typically using MPLS as the transport. It works at Layer 2 and relies on predefined MPLS paths for predictable performance.
  • SD-WAN creates a software-defined overlay at Layer 3 that sits on top of any underlay – MPLS, internet or 4G/5G. It routes traffic dynamically across multiple connection types, giving you centralised control, real-time visibility and direct access to cloud services.

So if you need fast, low latency LAN-like performance for critical applications, VPLS may be right for you. If you need more flexible, hybrid connectivity with easy cloud integration, SD-WAN may be the better choice.

Learn more about SD-WAN

Is VPLS secure for my business?

VPLS is secure because it runs over your provider’s private core network, not the public internet. Customer traffic is logically separated using MPLS labels, so each organisation’s data stays isolated.

VPLS also limits external visibility. Your Layer 2 traffic is carried across the provider’s network, but your internal IP addressing and routing decisions remain within your own network.

However, VPLS doesn’t encrypt traffic by default. If traffic were compromised inside a provider’s core network, the data packets could theoretically be read.

So if you’re in a regulated sector like healthcare, finance or the public sector, you should add encryption. MACsec or IPsec overlays are commonly used to meet compliance and data-protection regulations.

Overall, VPLS provides a secure network for most business use cases. But security ultimately depends on your provider’s infrastructure. Choose a provider you can trust with a resilient, B2B-only backbone and proven track record.

What are the advantages of VPLS?

VPLS offers several benefits if you need to link multiple sites across a wide area network:

  Feature What it means for your business
✓ LAN-like Ethernet connectivity over a WAN Extends your LAN across sites, so remote locations feel as if they’re on one local network.
✓ Any-to-any connectivity Connects every site directly to every other without backhauling traffic.
✓ High performance Delivers reliable, low latency connectivity over a resilient MPLS backbone.
✓ Control Keeps routing and IP addressing within your network, reducing reliance on your provider.
✓ Scalability Makes it easy to add new sites without deploying complex point‑to‑point links.
✓ Simplicity Relies on familiar Ethernet technology, making it easy for your IT team to manage.
✓ Cost Runs over established Ethernet and MPLS infrastructure, often more cost-effective than legacy WAN services.

 

Common VPLS limitations

VPLS is secure, but it doesn’t have native encryption. If you’re in a highly regulated industry, you may need to add external encryption to meet compliance requirements.

You can easily add new sites to your network using a full mesh of pseudowires – virtual point-to-point connections. But the design can become complex as the number of sites grows.

VPLS also transmits all broadcast (one-to-all), unknown unicast (one-to-one when the destination isn’t known), and multicast (one-to-many) traffic across the entire mesh. In larger deployments, this can use unnecessary bandwidth and increase the risk of traffic flooding.

So VPLS can be a great choice for small or medium-sized networks that need LAN-like performance across multiple sites. It’s less suited to very large, complex or cloud-first network architectures.

VPLS use cases

A VPLS network can be ideal for several enterprise applications, including:

  • Connecting multisite businesses: VPLS links all your offices into one Ethernet domain, so teams share resources as if they’re on the same LAN.
  • Data centre interconnects: It delivers high capacity, low latency connectivity for syncing workloads, storage and backup.
  • Financial services: Low latency and consistent performance support trading platforms and real-time data feeds.
  • Healthcare: Hospitals and clinics can share large imaging files across sites without relying on the public internet.
  • Retail: You can run centralised point-of-sale systems and inventory management across multiple branches with consistent performance.
  • Manufacturing: Factories can connect production systems and IoT devices to headquarters for real-time monitoring and control.

But whatever your sector, your VPLS network will only perform as well as your provider’s underlying infrastructure.

How to choose a VPLS provider

From initial design to long-term growth, you need a provider that can deliver the performance, scale and reliability your organisation depends on. Here are some questions to consider when weighing your options.

Network reach

Can they connect all your sites, including remote locations? Do they offer a choice of access tails?

Performance guarantees

Do they offer SLAs that support your business‑critical applications? Do they spell out the uptime and fix times you can expect?

Resilience and reliability

Do they run a resilient core network with built-in redundancy? Do they offer diverse routing and failover options across your network?

Security options

How is your traffic separated on their infrastructure? Do they support encryption methods like MACsec and IPsec?

Service flexibility

Can you upgrade bandwidth and add sites quickly? Can they integrate with MPLS, SD‑WAN or cloud services as your needs evolve?

Operational support

Do they offer proactive monitoring and fast fault resolution? Do they have 24/7, UK-based customer service and engineering teams?

Commercial transparency

Are the costs clear, with predictable pricing for access, bandwidth and contract changes? Do the contract terms give you the flexibility your organisation needs?

Track record

Do they have experience delivering complex VPLS deployments for businesses like yours? Providers may promise the earth, but can they deliver?

Ultimately, do you trust them to deliver what they promise, when they promise it?

VPLS solutions

If you’re looking for a VPLS provider you can trust to deliver, Neos Networks can help. Enterprise and public sector organisations trust us to connect Critical National Infrastructure across the UK.

To explore our high capacity, low latency Business Ethernet services – including VPLS for multisite connectivity – download our brochure.

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Not sure whether VPLS, SD-WAN or another service is right for your organisation? Get in touch. We’ll help you build a future-ready network you can scale as you grow.

VPLS: FAQs

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EPL vs EVPL networks

EPL and EVPL both provide a secure, high capacity Ethernet connection between your sites. Which is right for your business?

Neos Networks | 24 December 2025

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What is Ethernet Private Line (EPL)?

Ethernet Private Line (EPL) is a point-to-point (P2P) connection between two locations. It provides high capacity, low latency connectivity with guaranteed bandwidth. And because it’s a dedicated line for your business, it’s inherently secure.

For example, Neos Networks EPL connects your sites using a pair of dedicated User Network Interfaces (UNIs) and our high capacity fibre network.

Neos Networks EPL: point-to-point Ethernet

Neos Networks EPL, an Ethernet point-to-point service, showing a dedicated Ethernet link between two customer premises via the Neos Networks backbone and third-party access networks.

 

What are the benefits of EPL?

EPL gives you guaranteed performance for critical site-to-site connectivity, including:

  • A dedicated connection: private P2P connectivity between two locations
  • Scalability: high capacity scalable from 10Mbps to 10Gbps+
  • Security: the connection doesn’t cross the internet, so it’s inherently secure
  • Reliability: no traffic congestion from other users ensures consistent performance
  • Low latency: no other users contend for bandwidth, so latency remains stable

In short, EPL is a high capacity P2P connection that’s ideal for mission-critical links between two sites.

EPL use cases

EPL’s reliable, P2P connectivity is ideal for critical business operations, such as:

  • Linking headquarters to branch offices for video, voice and real-time data exchange
  • Connecting data centres for data replication, backup and disaster recovery
  • High-bandwidth, latency-sensitive applications in sectors like finance and the media
  • Secure data transfer for regulated sectors like healthcare, finance and government
  • Connecting directly to major cloud service providers to ensure performance and security

What is Ethernet Virtual Private Line (EVPL)?

Like EPL, Ethernet Virtual Private Line (EVPL) offers a dedicated connection that doesn’t cross the public internet. However, EVPL supports multiple Ethernet Virtual Connections (EVCs) on a single UNI, so you can create point-to-multipoint (P2MP) links.

For example, Neos Networks EVPL allows you to securely connect a central hub to several other premises via our high capacity network.

Neos Networks EVPL: point-to-multipoint Ethernet

Neos Networks EVPL, showing a dedicated Ethernet link between one customer hub and multiple customer premises via the Neos Networks backbone and third-party access networks

 

What are the benefits of EVPL?

EVPL gives you a secure, high capacity connection like EPL, but with added flexibility. P2MP functionality means you can add sites as your business grows. It’s a cost-effective way to link several locations to a central hub – a “hub-and-spoke” model – without installing multiple dedicated lines.

EVPL use cases

EVPL can work well for organisations that need secure, scalable connectivity across multiple sites. Typical scenarios include:

  • Linking a head office to several regional branches
  • Running real-time services such as voice, video and collaboration tools across locations
  • Giving multiple sites direct, high-speed access to cloud platforms
  • Expanding your network easily without installing separate dedicated circuits

EPL vs EVPL networks

Both EPL and EVPL give you secure, high capacity connectivity you can scale up to 10Gbps or more. They combine the simplicity of private connections with the flexibility and scalability of MPLS technology.

The key difference is that EPL is point-to-point (P2P), while EVPL is point-to-multipoint (P2MP). Here’s a summary of how they differ:

EPL EVPL
Topology P2P – connects two sites directly P2MP – connects a central hub to multiple branches (hub and spoke)
EVC/UNI configuration One Ethernet Virtual Connection (EVC) per physical port (UNI) Multiple EVCs can share a single UNI
Scalability Limited: each new site needs a new dedicated line High: easily add new sites via virtual circuits without new physical lines
Bandwidth Typically up to 10Gbps+ on a dedicated line Up to 10Gbps+ on a dedicated line but shared across multiple virtual circuits
Performance Fully dedicated path for consistent performance and the lowest latency Shared bandwidth across EVCs: performance can vary slightly depending on traffic allocation
Cost Higher for networks with many branches as each one needs a dedicated line More cost-effective for multisite networks as it uses virtual circuits

 

EPL vs EVPL: which is right for your business?

If you need a simple, secure link between two sites with guaranteed bandwidth and the lowest latency, EPL could be a good choice. Choose EVPL if you want a more cost-effective solution for multiple locations – a hub-and-spoke network you can scale easily.

EPL and EVPL are both E-Line Ethernet services, as defined by the Mplify Alliance. There are various other Business Ethernet options, such as VPLS (E-LAN) for any-to-any connections or NNI (E-Access), a high capacity connection to external networks.

At Neos Networks, we offer a range of high capacity, low latency Ethernet services across our UK-wide network. If you’d like to discuss which Ethernet service is best for your organisation, get in touch. Or download the brochure to find out more.

Get high-bandwidth Business Ethernet

Download brochure

EPL vs EVPL: FAQs

  • What is the core difference between EPL and EVPL?

    EPL connects two sites with a dedicated point-to-point (P2P) link. EVPL can be P2P, but it also supports service multiplexing. This enables point-to-multipoint (P2MP) connectivity, so you can link one site to several others in a hub-and-spoke network.

  • What is service multiplexing in EVPL?

    Service multiplexing lets you run multiple Ethernet Virtual Connections (EVCs) over a single physical port (UNI) using VLAN tags to separate traffic. This means you can connect several sites or services without installing extra circuits, giving you greater flexibility and cost efficiency.

  • Which is more cost-effective, EPL or EVPL?

    EVPL is usually more cost-effective if you need to connect three or more sites. It uses service multiplexing with VLAN tags to run multiple virtual circuits over a single physical port, so you avoid installing dedicated lines for each location.

  • Are EPL and EVPL both secure?

    Yes, both EPL and EVPL are secure because they don’t cross the public internet, reducing exposure to cyber threats. EPL is slightly more isolated because it provides a dedicated physical path, while EVPL uses logical separation via VLAN tagging on a single physical port.

  • Are EPL and EVPL both scalable?

    Yes, you can easily scale bandwidth for both services from 10Mbps to 10Gbps or more. For network growth, EVPL offers greater flexibility because you can add multiple sites without installing new physical circuits.

  • Can EPL and EVPL support cloud connectivity?

    Yes, both services can connect directly to major cloud providers for secure, high-performance access. EPL is ideal if you need a dedicated, low-latency link to cloud services for a single location. EVPL works well when multiple sites need direct cloud access through a hub-and-spoke design.

  • How does EPL and EVPL differ from SD-WAN?

    EPL and EVPL are both private Ethernet services that give you dedicated, high capacity connectivity. In contrast, SD-WAN creates a software-defined overlay that routes traffic dynamically across multiple connection types, including MPLS, internet and 4G/5G, giving you flexibility, visibility and centralised control.

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