Backbone cabling. Black Box structured cabling, DESKTOP TELCO

Below you will find brief information for structured cabling. This guide will provide an overview of the standards and practices that govern structured cabling systems. For expert advice on your new or upgraded structured cabling system, and for complete services ranging from design and products through installation and maintenance, call Black Box.

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Structured Cabling System

Backbone Topology

Equipment room main cross-connect

Backbone cable

Telecommunications room

To work area via horizontal cable

Backbone cable

Equipment room intermediate cross-connect

Backbone cable

Telecommunications room

To work area via horizontal cable

Physical environment.

– EMI. Install copper away from areas of EMI.

– Physical plant systems. Install away from a building’s physical plant systems, such as electrical wiring, plumbing, and sprinklers.

Do not install backbone cable in elevator shafts.

– Environment. Air spaces should be examined for dampness, which can corrode copper cable.

In addition, take into account all pathway standards and requirements.

– Fire resistance. Pay attention to all fire regulations.

– Security. Make sure your backbone cable and all equipment and telecommunications rooms are inaccessible to unauthorized personnel. a central location called the main cross-connect. Each telecommunications room or equipment room is cabled to the main cross-connect either directly or via an intermediate cross-connect. A benefit of this topology is that it provides damage control. If a cable goes out, only that segment is involved. Others are unaffected.

Here are some backbone cabling recommendations:

• The backbone system shall be installed in a hierarchical star topology.

• From the horizontal cross-connect, there shall be no more than one additional cross-connect to reach the main cross-connect.

• There should be no more than two levels of backbone cross-connects.

• There shall be no bridged taps and splitters.

• Make sure you meet all grounding requirements.

Recognized media.

The cable you choose depends on your application and distance requirements. Fiber and copper cables have different characteristics that may make one more suitable for a particular application over the other. You may even use a combination of the two.

For instance, you can use fiber to connect runs between buildings and for the vertical riser within a building. But you may decide to use copper for the second level backbone connecting the intermediate cross-connects to the horizontal cross-connects.

Recognized cables include:

• 4-pair, 100-ohm twisted-pair cable

(TIA/EIA-568-B.2).

• 50- or 62.5-micron multimode fiber optic cable

(TIA/EIA-568-B.3).

• Single-mode fiber optic cable (TIA/EIA-568-B.3).

Backbone topology.

The recommended topology is a conventional hierarchical star where all the wiring radiates from

Media Type

100-ohm Copper

Multimode Fiber

Single-mode Fiber

Maximum distances.

Backbone cable distances depend on the application as well as the cable used. For allowed distances, see the chart below .

Backbone Cabling Distances

Main Cross-Connect to Main Cross-Connect to

Horizontal Cross-Connect Intermediate Cross-Connect

800 m (2624.7 ft.)

2000 m (6561.7 ft.)

3000 m (9842.5 ft.)

500 m (1640.4 ft.)

1700 m (5577.4 ft.)

2700 m (8858.3 ft.)

Intermediate Cross-Connect to Horizontal Cross-Connect

300 m (984.3 ft.)

20 Black Box Guide to Structured Cabling

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Key features

System supports data, voice, video, and multimedia applications
15-20 years life span
Open standards based
Supports multiple applications
Modular, open-standard systems for easy changes and expansion
High bandwidth for future growth
Accommodates frequent changes

Frequently asked questions

A structured cabling system is the wiring network that carries all your data, voice, multimedia, security, VoIP, PoE, and even wireless connections throughout your building or campus. It includes everything from the data center to the desktop, including cabling, connecting hardware, equipment, telecommunications rooms, cable pathways, work areas, and even the jacks on the wallplate in your office.

A structured cabling system is as important to the success of your organization as the people are who work in it. A well-planned structured cabling system facilitates the continuous flow of information, enables the sharing of resources, promotes smooth operations, accommodates ever-changing technology, offers plenty of room for growth, and evolves with your organization. Plus, it will be around far longer than your current PC, server, and network switches. In essence, a structured cabling system is the lifeblood of your organization. If done right, it will serve you well for years. If not, your organization’s growth and bottom line can suffer.

The importance of structured cabling has increased right alongside the growth of LANs, MANs, and WANs. It started with individuals working on standalone PCs. It didn’t take long to connect those PCs into workgroups and then to connect those workgroups to a server. One server became multiple servers. And the rest is history. Today’s networks are complex systems running on technologies that no one could have imagined just 15 years ago.