MIL-STD-2042-1B(SH)
3.27.2 System spare fiber. A spare fiber that is allocated and not used and that is reserved for use by a specific system.
3.28 System growth fiber. An allocated and not used fiber identified as a growth requirement for a specific system.
3.29 System redundant fiber. An allocated and not used fiber identified by the user system as a required alternately routed fiber.
3.30 System specific cable. An optical fiber cable that connects end user equipments and does not interface with a FOCP (see 3.16).
3.31 Trunk. A set of trunk cables that run along the same cableways between two FOCP boxes (TRBs, FOICBs).
3.32 Trunk cable. An optical fiber cable that runs between two FOICBs. Typically, trunk cables are run in the main cableways and have higher fiber counts per cable than local cables.
3.32.1 Conventional trunk cable. A conventional optical fiber cable that runs between two FOICBs.
3.32.2 BOF trunk cable. A single BOF cable connected between two FOCP TRBs
or between a FOCP TRB and a FOCP FOICB. A BOF trunk cable contains multiple BOF trunk
tubes.
3.33 Tube furcation unit. An assembly attached to the end of a BOF tube in a BOF cable used to separate the fibers and provide a cable structure to facilitate the termination of the optical fibers from that BOF tube.
3.34 Unallocated fiber. A fiber that is not designated for use for any system, but is required as part of the FOCT configuration. Unallocated fibers include FOCP spare fibers and FOCP growth fibers.
3.35 Unused fiber. A fiber that is not designated for use for any system and not required as part of the FOCT configuration. Unused fibers occur within the fiber optic cable topology when the required systems fibers are less than the number of fibers available within a standard cable size.
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