Structured Cabling

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 five subsystems:
Demarcation Point is the point where the telephone company network ends and connects with the  on-premises wiring at the customer premises.
Equipment/Telecommunication Rooms house equipment and wiring consolidation points that  serve the users inside the building or campus.
Vertical or Riser Cabling connects between the equipment/telecommunication rooms, so named  because the rooms are typically on different floors.
Horizontal Wiring can be IW (inside wiring) or Plenum Cabling and connects telecommunications  rooms to individual outlets or work areas on the floor, usually through the pathways, conduits or  ceiling spaces of each 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 various kinds of cable, most commonly category 5e (CAT-5e), category 6 (CAT-6), and fiber optic cabling and modular connectors. These standards define how to lay the cabling in various topologies in order to meet the needs of the customer, typically using a central patch panel (which is normally 19 inch rack-mounted), from where each modular connection can be used as needed. Each outlet is then patched into a network switch (normally also rack-mounted) for network use or into an IP or PBX (private branch exchange) telephone system patch panel.

Color Coding patch cables is very common 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 conductors in Cat5/5e/6 cable are connected, resisting the temptation to ‘double-up’ or use one cable for both voice and data. IP phone systems, however, can run the telephone and the computer on the same wires.

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