MIL-HDBK-2051 Fiber Optic Shipboard Cable Topology Design GuidanceThis handbook contains suggested design rules for defining a fiber optic cable topology. In addition, this document describes a suggested approach for developing and designing a fiber optic cable topology FOCT for a Naval platform and also identifies the applicable fiber optic component specifications. This handbook is primarily intended for use by the fiber optic cable topology design engineer, but provides useful information to a system design engineer as well.

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MIL-HDBK-2051(SH)

3.  DEFINITIONS

3.1   Acronyms .  The acronyms used in this handbook are defined as follows:

3.2   Definitions .  Definitions for general fiber optics terms used in this handbook are in accordance with EIA/TIA-440.  Definitions for other terms as they are used in this handbook are given in the following paragraphs.

3.2.1  Allocated and used fiber  .  An allocated and used fiber is a fiber that is designated and required for use for a particular system link, and is being used to transmit information.  Allocated and used fibers include fibers used for normal channels, fibers for alternate channels, and fibers for non redundant channels.

3.2.2  Allocated and not used fiber  .  An allocated and not used fiber is a fiber that is designated for use for a particular system, but is not being

used to transmit information.  Allocated and not used fibers include fibers allocated as system spare fibers, system growth fibers, and system redundant fibers.

3.2.3  Alternate channel .  An alternate channel is the allocated and used active backup link for a normal channel.

3.2.4  End user equipment .  End user equipment refers to any cabinet, case, panel, or device that contains components that are either the origin or destination of an optical signal.

3.2.5  Fiber optic cable plant  .  The fiber optic cable plant consists of the fiber optic interconnection boxes, trunk cables and the connectors and splices used to terminate the trunk cables.

3.2.6  Growth fiber .  An unallocated fiber intended for later use in the installation of fiber optic systems after initial ship construction.

3.2.7  Intermediate interconnection box  .  An interconnection box in which two trunk fibers are interconnected.

3.2.8  Local cable .  A local cable is a fiber optic cable that provides a continuous optical path between an interconnection box (or outlet) and an end user equipment or between an interconnection box and an outlet, and is typically not run through the main cableways.

3.2.9  Nonadjacent trunk links  .  Links in a network which do not connect to a common node.

3.2.10   Non redundant channel (NRC)  .  A non redundant channel is any allocated and used active link that has no system required backup link.

3.2.11   Normal channel .  A normal channel is an allocated and used active link between end user equipment which has a designated active backup link.

3.2.12   Outlet.  An outlet is a small termination box used to break out a local cable from an interconnection box to one or more equipments within a compartment.

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