Technology – Cabling For Computer LAN Networks
What is structured cabling?
Modern computer LAN (local area network) wiring has the concept of structured cabling.
Based on aforementioned reasons, structured wiring standard has been developed to help define a computer wiring system that stays within the maximum wiring distance for various LAN topologies. For example, the horizontal cable wiring length is 100 meters for 100BaseT networks.
What do we do to observe the 100 meters wiring standard?
These telecom rooms are then interconnected to provide the total network connectivity for the building.
On each floor, a telecom room concentrates all workstation cables for that floor. Each workstation has a wall mounted jack. The network cable is terminated at that jack and runs directly to the telecom room. The cable may run in wire trays or conduit, or be draped over supports such as a drop ceiling. For larger floors, more than one telecom room may be needed.
Horizontal Cabling
The punchdown terminations or patch panels could be rack mounted (19” or 23” racks), cabinet mounted or wall mounted.
In the telecom room, network equipment such as a hub or switch is connected to each station cable, which electrically terminates the cable run.
Vertical Cabling (Backbone Cabling)
Telecom rooms on each floor are then connected together by backbone cabling (also called vertical cabling for floor to floor connections). These backbone cablings typically are done from floor to floor to floor.
Another advantage of fiber is that fibers can run much longer distance than copper cable, which makes them especially attractive for backbone cabling.
The difference between backbone cabling and horizontal cabling
Since backbone cabling typically passes through from floor to floor, the cables used for backbone cabling have very different requirement than the horizontal cablings.
Physical securing. Physical securing for vertical riser cables is also different than horizontal cables. So is the cable strength, since vertical riser cables need to have enough strength to support its own weight.
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August 16th, 2010 at 8:43 pm