The portion of premises telecommunications cabling that provides connections between telecommunications closets, equipment rooms, and entrance facilities. The backbone cabling consists of the transmission media (optical fiber cable), main and intermediate cross-connects, and terminations for the horizontal cross-connect, equipment rooms, and entrance facilities. The backbone cabling can further be classified as interbuilding backbone (cabling between buildings), or intrabuilding backbone (cabling within a building).

The portion of the cabling that provides connections between communication closets, equipment rooms and entrance facilities.

The cabling that distributes voice and data services between the equipment room, telecommunications closets, and between buildings. See ' Horizontal Cabling.'

Cable and Connecting Hardware that comprise the main and intermediate cross-connects, as well as cable runs between comms closets, equipment rooms and entrance facilities.

Cabling between floors in a building or between buildings in a campus.

The inter-building and intra-building cable connections between entrance facilities, equipment rooms and telecommunications closets. Backbone cabling consists of the transmission media, main and intermediate cross-connects and terminations at these locations. Learn more about Backbone Cabling...

Cabling that provides interconnections between wiring closets, wiring closets and the POP, and between buildings that are part of the same LAN. See vertical cabling.