The Six Subsystems of a Structured Cabling System

Last Updated : June 16 2017

The Six Subsystems of a Structured Cabling System

by Nick Timberlake 2017 June 16

If you are into technology and want to learn how some systems like telephony work, then you may start by knowing the six subsystems of a structured cabling system. I promise you, this is going to be interesting! 

Let's get started!

The Six Subsystems of a Structured Cabling System


A structured cabling system is a type of an open network structure used by different systems like telephony, building automation, data access control, etc. This system can provide significant economic operation and flexibility. It is divided into six parts that include the work area component, horizontal and backbone cabling component, equipment component, telecommunication closet rooms component and the entrance facility component. The information below is based on generic telecommunication for customer premises that uses generic infrastructure and a commercial building telecommunication cabling standard that uses Commercial building infrastructure.

Work area

The components of the Work Area are extended from telecommunications outlet or connector end of the horizontal cabling system to its equipment. The parts you'll find used in this section include station equipment, patch cables, and communication outlets. For Station equipment, you may find things like data terminals, computers, telephones, etc., while the patch cable components you will find stuff like PC adapter cables, modular cords, fiber patch cable, etc.

Horizontal cabling section

The horizontal cabling section extends from the telecommunication information outlet of Work Area to telecom closet. The main components you will find in this section include telecommunication outlet, cable termination, cross connection, a one transition point maximum, a wire to Work Area from patch panel and cross connection in telecom rooms.

Backbone cabling section

Backbone cabling section does provide an interconnection between a telecommunication closet, equipment room, etc. This section includes components like a backbone cable (optical fiber cable) mechanical termination and patch cables used for Backbone to backbone cross connection. There are two subsystems defined by this section they include.

- Cabling Subsystem two

In this subsystem, you'll find backbone cabling interconnecting a horizontal cross-connect and intermediate cross-connect.

- Cabling Subsystem three

In this subsystem, you'll find backbone cabling section interconnecting intermediate cross-connect, and the main cross-connect.


Equipment room

The Equipment Room section is a centralized space environmentally controlled for telecommunication equipment. You may find this part more complex than telecom room or a telecommunication enclosure. The section usually houses central cross connects like the C distributor and can contain an intermediate cross-connect and horizontal cross-connect.

Telecommunication Closet room

A telecommunication closet room houses both the horizontal and backbone cable termination to connect hardware that includes any patch cords or jumpers. This part may also contain intermediate cross-connect or main cross-connect for various portions of backbone cabling section. The section can also provide a controlled environment to a connecting hardware, splice enclosure and house telecommunication equipment that serves a portion of the building.

Entrance facilities section

The Entrance facilities section does contain a cable, connecting hardware, network demarcation point, protection device and other equipment that connect to private network or access provider cabling. The section includes connections that are between outside plant and inside building cabling.


The above are six subsystems of a structured cabling system. One thing you should note is that once you create a structured cabling system, it would be instrumental to the high performance of various cable deployments of your business resulting in an efficient communication within your business. If you are thinking of hiring a company to provide you cabling solutions for your business, the more that you need to learn the basics of structured cabling so you are not going to be taken advantage of.

Nick Timberlake
#1 Nick TimberlakeAuthor 18 March, 2014, 12:37 Nick is an avid writer and a sports fanatic. He came from a small town in Australia but now living in Southern California.