HORIZONTAL CABLING (CABLING SUBSYSTEM 1)

Horizontal cabling includes horizontal cable, telecommunications outlet/connectors in the work area (WA), mechanical terminations and patch cords or jumpers located in a telecommunications room (TR) or telecommunications enclosure (TE) and may incorporate multi-user telecommunications outlet assemblies (MUTOAs) and consolidation points (CPs). The pathways and spaces to support horizontal cabling shall be designed and installed in accordance with the requirements of TIA-569-B.

Some networks or services require applications-specific electrical components (such as impedance matching devices). These application-specific electrical components shall not be installed as part of the horizontal cabling. When needed, such electrical components shall be placed external to the telecommunications outlet/connector. Keeping application-specific components external to the telecommunications outlet/connector will facilitate the use of the horizontal cabling for varying network and service requirements. 

A minimum of two permanent links shall be provided for each work area. The cabling should beplanned to accommodate future equipment needs, diverse user applications, ongoing maintenance, relocation and service changes. Indeed, horizontal cabling is often less accessible than backbone cabling and adding or changing horizontal cabling may cause disruption to occupants and their work once the building walls and ceilings are closed after the initial installation. The time, effort, and skills required for these subsequent changes are significant and make the choice and design layout of the horizontal cabling very important to the building occupants and to the maintenance of the telecommunications infrastructure. Therefore, it is incumbent on the designer to accommodate user needs and to reduce or eliminate the probability of requiring changes to the horizontal cabling as user requirements evolve.

Each 4-pair cable at the equipment outlet shall be terminated in an eight-position modular jack. The telecommunications outlet/connector for 100-ohm balanced twisted-pair cable shall meet the requirements of ANSI/TIA/EIA-568-B.2.

Optical fibers at the equipment outlet shall be terminated to a duplex optical fiber outlet/connector meeting the requirements of ANSI/TIA-568-C.3