Black Box DESKTOP TELCO Spezifikationen PDF herunterladen (Seite 18)

Black Box Guide to Structured Cabling

Section NameSection Name

Structured Cabling System

5 m (16.4 ft.) maximum

Telecommunications room

Patch cable: 5 m

(16 ft.);

Total patch cable

on both ends:

10 m (32.8 ft.)

Telecommunications

outlet

Telecommunications

outlet

Telecommunications

outlet

Work area

90 m (295 ft.) maximum

Planning horizontal cabling.

The horizontal cabling system encompasses every-

thing between the telecommunications room cross-

connects to the outlets in the work area. It’s specified

in TIA/EIA-568-B.1 and includes:

• Horizontal cabling.

• Telecommunications outlets.

• Telecommunications connectors.

• Cross-connects.

• Patch cords.

• Consolidation point (if any).

Most of the cables in your building will be part of

the horizontal cabling system. These can include your

voice, data, multimedia, security, HVAC, PoE, wireless,

and other systems.

After a building is constructed, the horizontal

cabling system is subject to the most activity in

terms of users, locations, changes in building layouts,

and more. But the horizontal cable is much less

accessible than the backbone cable. To change the

horizontal cabling after installation can be very

expensive, time-consuming, and disruptive. Plan

carefully because the horizontal cabling is extremely

important to the design and effectiveness of your

cabling system.

Horizontal cabling considerations.

Change. Plan for it. Accept the fact that after

your system is up, most of the work will be MACs.

You should be able to relocate users and equipment

without changing the cable or disrupting users. Run

cable to all areas of the building, even if they’re

vacant. When expansion occurs, you’ll be ready.

Maintenance. Set up your system so that it

facilitates on-going maintenance.

Equipment. Satisfy current network requirements,

but consider future equipment changes, too.

Applications. Consider your current applications

while planning for more bandwidth-intensive

applications in the future.

User work areas. Don’t be surprised if your

organization decides to change its floor plan—

frequently. Just be prepared.

Keeping up appearances. To maintain a neat

office, horizontal cabling should never be visible.

There are many installation methods, including raised

access floor, conduit, cable trays, ceiling pathways,

raceways, and perimeter pathways.

Physical layouts. Consider how and where you’re

going to run cable. Do you have enough space to

Horizontal cabling

Work area

5 m (16.4 ft.) maximum

90 m (295 ft.) maximum

Horizontal Cabling Distances

Phone

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