MIL-HDBK-2051(SH)
4. GENERAL
4.1 Fiber optic cable topology (FOCT) concept . The concept of the FOCT is that of a shared resource. It is an integrated fiber optic cabling system installed during ship construction (or major overhaul) that supports all
shipboard intercompartment fiber optic interconnect requirements. This includes growth, expansion and reconfiguration throughout the life of the ship. A fiber optic cable plant (FOCP) is laid in the ship interconnecting key locations. End user equipments connect into this FOCP rather than laying individual cables between the equipments. The FOCP is configured so that
point-to-point links or networks are easily accommodated. The FOCP and FOCT are most efficient when there are many different systems requiring fiber optic interconnects located throughout the ship.
4.1.1 FOCT characteristics . The FOCT consists of fibers and cables, splices, connectors and interconnection boxes. Because fibers and cables are light-weight and small, unused fibers may be installed during ship construction to provide available fibers when fiber optic systems are installed after the ship has been delivered to the Navy. Additionally, redundant fibers may be installed so that links that are lost due to battle damage can be restored by reconfiguring around the damaged cable section.
4.1.2 Cable. An end user equipment accesses the FOCP by running a cable from the equipment to an interconnection box. This cable is called a local cable. Interconnection boxes are connected together with cables called trunk cables. The local cables are interconnected with the trunk cables to provide a complete link between end user equipments (see figure 1). The set of complete links defines the FOCT for a particular platform.
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