Tuesday, November 18, 2008

STRUCTURED CABLING (PASSIVE AND ACTIVE)

STRUCTURED CABLING (COPPER AND FIBER)

Structured cabling is building or campus telecommunications cabling infrastructure that consists of a number of standardized smaller elements (hence structured) called subsystems.

Structured cabling falls into six subsystems:

§ Entrance Facilities are where the building interfaces with the outside world.

§ Equipment Rooms host equipment which serve the users inside the building.

§ Telecommunications Rooms house telecommunication equipment which connect the backbone and the horizontal cabling subsystems.

§ Backbone Cabling connect between the entrance facilities, equipment rooms and telecommunications rooms.

§ Horizontal Cabling connect telecommunications rooms to individual outlets on the floor.

§ Work-Area Components connect end-user equipment to outlets of the horizontal cabling system.

Structured cabling design and installation is governed by a set of standards that specify wiring data centers, offices, and apartment buildings for data or voice communications, using category 5 (CAT 5E) or category 6 cable (CAT 6) and modular sockets. These standards define how to lay the cabling in a star formation, such that all outlets terminate at a central patch panel (which is normally 19 inch rack-mounted), from where it can be determined exactly how these connections will be used. Each outlet can be 'patched' into a data network switch (normally also rack mounted alongside), or patched into a 'telecoms patch panel' which forms a bridge into a private branch exchange (PBX) telephone system, thus making the connection a voice port.

Lines patched as data ports into a network switch require simple straight-through patch cables at the other end to connect a computer. Voice patches to PBXs in most countries require an adapter at the remote end to translate the configuration on 8P8C modular connectors into the local standard telephone wall socket. No adapter is needed in the U.S. as the 6P6C plug used with RJ11 telephone connections is physically compatible with the larger 8P8C (RJ-45) socket and the wiring of the 8P8C is compatible with RJ11. In the UK, an adapter must be present at the remote end as the 6-pin BT socket is physically incompatible with 8P8C.

It is common to color code patch panel cables to identify the type of connection, though structured cabling standards do not require it, except in the demarcation wall field.

Cabling standards demand that all eight connectors in Cat5/5e/6 cable are connected, resisting the temptation to 'double-up' or use one cable for both voice and data.

17 comments:

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  4. How do I determine the number of cables required??Eg:the schematic says 120 data outlets and 30 telephone outlets.What are the factors we must consider to determine the number of rolls of cables required??

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