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)

(1) All FOCT trunk links for the normal LAN should be colocated and shielded to the maximum extent possible utilizing the ship structure and armoring for protection. Likewise, all of the FOCT trunk links for the alternate LAN should be colocated and shielded to the maximum extent possible utilizing the ship structure and armoring for protection.

(2) The FOCT trunk links for the normal LAN should be survivably separated from the FOCT trunk links for the alternate LAN.

5.3.1.11 Special requirements . Special requirements for FOCT links can be determined from the system specifications and the ship specification. Special requirements include length, loss, and routing restrictions beyond those of typical FOCT links.

5.3.2 FOCT block diagram and isometric cabling diagram . A preliminary design block diagram and isometric cabling diagram of the FOCT should be produced. The drawings should include:

a. Interconnection box service areas

b. Interconnection box locations (identify compartment)

c. Trunk paths between interconnection boxes (separation requirements

noted)

d. Cable sizes and type for each trunk path

e. Number of single mode and multimode fibers in each trunk path

f. Number of fibers of each functional type in each trunk path

g. Termination type for each fiber to be terminated

h. Interconnection box sizes (1, 2 or 3 module)

i. Type of termination modules in each interconnection box

j. Notes on special performance requirements for any links

5.4 Detailed design . The detailed design phase is the final phase in the cable plant design process. It should be done at the same time as the ship's detailed design. The FOCT preliminary block diagram, the system specifications, and the ship specification provide the inputs to this phase. The output of this phase should be all of the documentation necessary to install the FOCT.

5.4.1 Detailed design process .

5.4.1.1 Trunk cable routing . In the design, particular care must be taken when selecting trunk paths between interconnection boxes. Where redundant and respective NRC fibers or alternate and respective normal fibers are in cables installed in the fore and aft direction, they should be survivably separated

in accordance with section 072 of the ship specification. Redundant and NRC fibers should come together only at the interconnection box that they service. Similarly, normal and alternate fibers should come together only at the end user equipment they support.

5.4.1.2 Local cable routing . Local cables should be routed from the end user equipment to the interconnection box for the service area containing the end user equipment. Systems which have normal and alternate channels should have the respective local cables routed to separate interconnection boxes. Local cables for normal and alternate channels should be survivably separated from each other once they are further than sixty feet from the end user equipment.