Guides and Explanations

How BERT and FEC testing validates high-speed Ethernet transmission after fibre certification, including 100G and higher-speed optical links, error performance and commissioning.

A practical guide to chromatic dispersion and polarisation mode dispersion testing, when CD/PMD measurements are required and how fibre characterisation complements OTDR and insertion-loss testing.

How to test Data Centre Interconnect fibre links for high-speed Ethernet, CWDM, DWDM and amplified networks, including insertion loss, ORL, OTDR, fibre characterisation, CD/PMD and BERT.

Learn how FTTx, GPON and XGS-PON fibre networks are tested, including insertion loss, optical power, ORL, OTDR, splitters, optical budgets, pre-activation testing and standards-based test methods.

Bi-directional OTDR testing helps engineers interpret splice and event losses by testing the same fibre link from both ends. Learn about gainers, losers, launch and receive fibres, trace interpretation and standards-based fibre testing.

Professional fibre optic testing is more than producing an OTDR trace. This guide explains OTDR testing, insertion-loss measurement, standards-based testing, bi-directional analysis, FTTx and PON testing, data centre interconnect testing, fibre characterisation and why CD/PMD testing matters for high-capacity transmission networks.

Optical LAN uses fibre-based passive optical network architecture to deliver high-capacity enterprise connectivity with fewer active network components. This guide explains how Optical LAN works, where it fits, its benefits, design considerations and applications across healthcare, education, campuses, hospitality and public-sector buildings.

In this blog post, we explain why coordinating civils and cabling can make external network projects easier to plan, build and hand over.

In this blog post, we explain how overhead fibre routes are assessed before installation, from desktop planning and pole inspections to span measurement, clearances, cable selection, access and final reporting.

In this blog post, we explain how cold aisle containment improves data centre airflow management, which problems it can solve, what a complete design must include and why monitoring and commissioning matter.

In this blog post, we explain how to prepare network infrastructure for a data centre relocation, from auditing the existing estate and preparing the new site to testing circuits, controlling the physical move and validating services.

This guide explains how building layout and construction materials affect enterprise Wi-Fi and what businesses can do to create wireless networks that remain fast, resilient and ready for growth.

This guide explains how cable blowing works, why it is less disruptive and where it can bring the greatest value to a modern fibre optic network.

Learn how FDNS can help businesses resolve existing network problems while building an infrastructure foundation that supports future growth.

In this guide, we'll explain what businesses should look for when selecting a telecoms infrastructure contractor, the questions you should ask before appointing one, and why experience, planning and long-term support are just as important as technical expertise.

In this article, we'll explore what makes multi-site telecoms infrastructure projects successful, the common challenges businesses face and the practical steps that help ensure every location is delivered to the same high standard.

In this article, we'll explore the warning signs that indicate it's time to upgrade your telecommunications infrastructure, the business benefits of doing so and why professional testing should always form part of the process.

In this article, we'll explain how to prepare your site before a fibre optic installation, the common challenges that arise when preparation is overlooked, and the practical steps that help projects run more efficiently.

This article explores why network site surveys remain one of the smartest investments businesses can make when planning telecommunications infrastructure projects.

This article explores why cyber resilience in telecoms has become so important, the challenges facing network operators, and the strategies being adopted to strengthen the security and resilience of modern telecommunications infrastructure.