MIL-HDBK-2051(SH)
5.3.1.5 Terminations . The type of termination used should be determined from the system drawings or specification. If there are no system requirements, either the MIL-C-83522/16 connector or the MIL-S-24623/4 splice may be used. Link loss budgets should be computed (if the system designer has not already done so) to ensure that the system link loss requirements can be met by the selected termination. The number of each type of termination
should be identified in either the block diagram or as a termination requirements list. This determines which termination modules are required in the interconnection box as well as the size of the interconnection box. This also helps the shipbuilder to more accurately determine the cost of the installation.
5.3.1.6 Service areas and interconnection boxes . The size of an interconnection box is determined by the number and types of interconnections required in a service area. The Navy standard interconnection box allows two different types of interconnection modules, one for connectors and one for splices. The splice module can consist of one or two splice tray holders
(each splice tray holder can house 36 splices), while the connector module can house 48 connections. The largest interconnection box available can house three interconnection modules.
5.3.1.6.1 Interconnection box growth . The interconnection box should have unused interconnection adaptors (splices or connectors) to provide for future growth. The number of unused adapters should be as specified in the ship specification. Generally, the number of unused termination spaces can be any combination of connectors or splices in interconnection boxes with both type terminations.
5.3.1.6.2 Unallocated fiber and unused fiber termination . The types of terminations (if any) required on unallocated fibers and unused fibers should
be as specified in the ship specification. Typically, both unallocated fibers and unused fibers are not terminated. However, these fibers should be
provided with a connector adaptor or splice tray position. These positions may be some of the unused connector adapter or splice tray positions provided for future growth.
5.3.1.6.3 Service area division . If the number of cables and terminations in a service area cannot be accommodated in a single interconnection box then that service area should be divided into separate service areas so that there
is only one interconnection box in each service area. An exception to this is if the service area is a single compartment. If the number of cables and terminations in a service area cannot be accommodated in a single interconnection box then more than one interconnection box can be used.
5.4.1.3 provides guidance on the use of multiple interconnection boxes within a service area.
5.3.1.6.4 Intermediate interconnection boxes . An intermediate interconnection box is an interconnection in which two trunk cables are connected together (see figure 3). The use of intermediate interconnection boxes should be avoided. If only one or two fibers are required between two interconnection boxes and an alternate route that uses an intermediate interconnection box is available, the use of an intermediate interconnection box may be justified (see figure 4). Link loss budgets should be computed to ensure that the link through the intermediate interconnection box meets the system link loss requirements.
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