Structured Cabling Systems: A Specifier's Guide

A structured cabling system is a standardised, hierarchical cabling infrastructure — designed to ISO/IEC 11801 — that supports all of a building's telecoms and data services on a common platform. Instead of separate ad-hoc cabling for each application, it uses defined subsystems (backbone, horizontal, work area, telecoms rooms) so the network is organised, testable, and straightforward to manage and expand.

The Subsystems of a Structured Cabling System

ISO/IEC 11801 divides the infrastructure into defined subsystems. Understanding them is the basis of a compliant design:

• Entrance facilities — where external services and inter-building backbones enter the building.
• Equipment / telecoms rooms — housing racks, cabinets, patch panels and active equipment.
• Backbone (riser) cabling — links between telecoms rooms and floors, usually fibre for bandwidth and distance.
• Horizontal cabling — from the floor's telecoms room out to each work-area outlet (the 90m permanent link).
• Work area — the outlet, faceplate and patch cord that connect the end device.

The Standards That Govern It

In Ireland these standards are referenced in public-sector, healthcare (HIQA/HSE) and OGP-framework project specifications. Building on them, a manufactured system like CNET's is engineered so that cable, connectivity and patching perform together to the declared class.

Copper or Fibre — Where Each Belongs

Testing, Certification and the CNET 25-Year Warranty

A structured cabling system is only as good as its test results. Every permanent link should be tested to the relevant ISO/IEC 11801 class with a calibrated field tester, and the results retained as the certification record.

"Structured cabling warranty" — the common questions.
A system warranty is not the same as a product guarantee. It certifies that the whole installed channel meets its performance class and will continue to, provided it was installed as a complete manufacturer's system by a registered installer and validated by submitted test data. It is what lets a client rely on the cabling for the building's life, not just the cable off the drum.

Planning a Compliant System: A Checklist

• Define the performance class up front (Class E / EA) against the building's design life and service needs.
• Design the subsystems — telecoms room locations, backbone routes, horizontal runs within the 90m limit.
• Choose media by layer — fibre backbone, copper horizontal, Cat6A for long/10G runs.
• Specify the full system from one manufacturer to keep the channel — and its warranty — intact.
• Size containment for the chosen cable diameter (Cat6A needs more than Cat6).
• Test every link to its class and retain the certification data for the warranty submission.

CNET Manufactures and Supplies — It Does Not Install

CNET is a cabling-system manufacturer and supplier. Installation is carried out by CNET certified installer partners. If you are specifying a system, CNET provides the components, datasheets and warranty; if you need the cabling installed, ask CNET to connect you with a registered installer.

Frequently Asked Questions

• What is a structured cabling system?

  A standardised, hierarchical cabling infrastructure — designed to ISO/IEC 11801 — that carries all of a building's data, voice and low-voltage services on one designed, tested and warranted platform, organised into defined subsystems rather than ad-hoc per-application cabling.
• What standard governs structured cabling?

  ISO/IEC 11801 internationally (EN 50173 in Europe, TIA/EIA-568 in North America). It defines the performance classes, subsystems and channel requirements a compliant system must meet.
• How long does structured cabling last?

  A well-designed copper/fibre system typically has a 15–25 year design life. A manufacturer system warranty — such as CNET's 25-year warranty — certifies the installed channel's performance for that period when installed as a complete system by a registered installer.
• Should the backbone be copper or fibre?

  Fibre is generally preferred for backbone and riser cabling on bandwidth, distance and electrical-isolation grounds. Copper (Cat6/Cat6A) is used for horizontal runs to the outlet, where PoE and cost favour it.