Black Box DESKTOP TELCO Especificaciones descargar pdf (Pagina 22)

Backbone Cabling Distances

Main Cross-Connect to Main Cross-Connect to Intermediate Cross-Connect

Media Type Horizontal Cross-Connect Intermediate Cross-Connect to Horizontal Cross-Connect

100-ohm Copper 800 m (2624.7 ft.) 500 m (1640.4 ft.) 300 m (984.3 ft.)

Multimode Fiber 2000 m (6561.7 ft.) 1700 m (5577.4 ft.) 300 m (984.3 ft.)

Single-mode Fiber 3000 m (9842.5 ft.) 2700 m (8858.3 ft.) 300 m (984.3 ft.)

Structured Cabling System

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.

Backbone topology.

The recommended topology is a conventional

hierarchical star where all the wiring radiates from

Black Box Guide to Structured Cabling

Backbone cable

Equipment room

intermediate cross-connect

Telecommunications room

To work area via horizontal cable

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).

Maximum distances.

Backbone cable distances depend on the

application as well as the cable used. For allowed

distances, see the chart below .

Equipment room

main cross-connect

Telecommunications room

To work area via horizontal cable

Backbone cable

Backbone Topology

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 47 48

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