Black Box DESKTOP TELCO Spezifikationen PDF herunterladen (Seite 21)

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Structured Cabling System

Planning backbone cabling.

Backbone cabling provides the main information

conduit connecting all your horizontal cabling within

a building and between buildings. It’s the inter-

connection between telecommunication rooms,

equipment rooms, and entrance facilities. In large

organizations, you can connect multiple LANs with

a high-speed backbone to create large service areas.

Backbone cabling is specified in TIA/EIA-568-B.1

and includes:

• Cabling

• Intermediate and main cross-connects

• Mechanical terminations

• Patch cords or jumpers for backbone-

to-backbone connections

Another type of backbone is called a collapsed

backbone. This is usually a short backbone that has a

central router or switch interconnecting all the LAN

segments in a given building.

The main requirement of any backbone is that

it be able to support your current needs as well as

future applications. When planning your backbone,

take these factors into consideration.

Performance and applications. Plan on far more

bandwidth than you think you’ll ever need.

Site size and user population. Current size and

future growth requirements must be considered.

Plan your backbone to accommodate the maximum

number of connections anticipated in all telecommun-

ications rooms, equipment rooms, and entrance

facilities. You may want to consider installing extra,

unused copper or ”dark” fiber cable for future needs.

Distance. The distance you run your backbone will

most likely determine the type(s) of cable you use.

Redundancy and diverse path routing. Consider

diverse path routing for mission-critical systems. This

consists of running redundant backbones in separate

pathways far from each other. The redundant cables

should never be run in the same conduit. Although

they terminate at the same place, they will follow

different routes to get there, such as on different

sides of a building.

Useful life. Be aware of the minimum length

of time the backbone cabling is expected to serve.

Replacing backbone cable is inconvenient and

expensive.

Entrance facility

Work area

2000 m (6561.7 ft.)

campus backbone

Backbone Cabling Distances

Backbone cabling

Building 2

Entrance facility

Building 1

Telecommunications room

90 m (295.3 ft.)

horizontal cabling

300 m (984.3 ft.) building

backbone cabling

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 47 48

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