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| Telecommunications rooms provide many different functions for the cabling system and are often treated as a distinct sub-system within the hierarchical cabling system. The primary function of a telecommunications room is the termination of horizontal and backbone cables to compatible connecting hardware. The cross-connection of horizontal and backbone cable terminations using jumpers or patch cords allows flexible connectivity when extending various services to telecommunications outlet/connectors. Connecting hardware, jumpers, and patch cords used for this purpose are collectively referred to as "horizontal cross-connections".

A telecommunications room may also contain the intermediate cross-connect or the main cross-connect for different portions of the backbone cabling system. Sometimes backbone-to-backbone cross-connections in the telecommunications room are used to tie different telecommunications rooms together in a ring, bus, or tree configuration.

A telecommunications room also provides a controlled environment to house telecommunications equipment, connecting hardware, and splice closures serving a portion of the building. The telecommunications room provides for the administration and routing of the equipment cables/cords from the horizontal cross-connect to the telecommunications equipment.

Requirements

- Telecommunications rooms shall be designed and provisioned according to the requirements in ANSI/TIA/EIA-569-A and addenda.

Recommendations

- In some cases, the demarcation point and associated protection apparatus may be located in the telecommunications room.
- A telecommunications room should be located on the same floor as the work areas served.

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