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)

4.3  Design methodology .  The FOCT design process involves a three phase approach:  conceptual, preliminary and detailed (see figure 2).  As each phase is completed the output from that phase becomes part of the input to the next phase.  Each design phase may be repeated as the ship system and ship design information and requirements are modified.  An optimal configuration with the appropriate documentation necessary to specify and install a FOCT is the final output of the detailed design phase.

4.3.1  Conceptual design .  The conceptual design phase is used to develop an initial FOCP configuration.  The inputs to this design phase are:

a. Ship specification

b. Ship configuration information

c. System specifications

d. Conceptual design guidelines (see 5.2.1)

These inputs can be used to determine the general location of interconnection boxes and the compartments that the interconnection box will service (service areas).  General interconnections between interconnection boxes can be identified, determining the trunk requirements for the FOCP.  A FOCP block diagram can be developed and is used as an input in the preliminary design phase.  If required, this information may also be depicted on an isometric cabling diagram.  Typical outputs of the conceptual design phase are:

a. Service area definition b. Block diagram showing

-  Interconnection box location (general)

-  Interconnection box service area

-  Trunks between interconnection boxes

c. Isometric cabling diagram showing

-  Interconnection box location (general)

-  Trunks between interconnection boxes

4.3.2  Preliminary design .  The preliminary design builds on the conceptual design providing more details on the FOCT configuration.  Inputs used to

develop the preliminary design are:

a. Conceptual design block diagram

b. Conceptual isometric cabling diagram

c. Detailed system requirements

d. Preliminary design guidelines (see 5.3.1)

e. Ship configuration information

f. Ship specification

The system requirements can be reviewed to determine the following FOCT

requirements:

a. Type of fiber

b. Number of fibers required

c. Type of cable for local cables

d. Type of termination to be used

e. Link loss requirements

4.3.2.1   System equipment location  .  The location of system equipments can be determined from the ship configuration drawings.

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