MIL-STD-2042-2B(SH)
4. GENERAL REQUIREMENTS
4.1 Fiber optic equipment installation. Interconnection boxes in accordance with MIL-I-24728 and tube routing boxes in accordance with MIL-I-24728 or MIL-E-
24142 shall be installed as specified herein. These methods may be extended to other fiber optic equipment when specified by the ship specification or the system drawings.
4.1.1 Interconnection box and tube routing box selection. The interconnection boxes and tube routing boxes selected shall be those identified in the ship specifications and drawings. Substitute boxes shall not be used without authorized approval (see 3.6). In those instances where the installing activity (see 3.18) is responsible for interconnection box selection, the box type shall be selected from MIL-I-24728 or as approved by the Naval Surface Warfare Center (see 1.1.1). The box shall be sized to provide sufficient capacity to accept the total number of fibers entering the box (including growth fibers) as specified by the ship specification
and system drawings. For boxes with BOF cabling, interconnection boxes shall have capacity for fiber that may be installed in unused BOF trunk tubes. In those instances where the installing activity is responsible for tube routing box selection, the box type shall be selected from either MIL-E-24142, MIL-I-24728, or as approved by the Naval Surface Warfare Center (see 1.1.1). Tube routing boxes shall be sized to provide sufficient capacity to accept the total number of BOF tubes entering the box.
4.1.2 Location. Boxes shall be located in accordance with the system drawings. In those instances where the installing activity is responsible for selecting box location, the following requirements apply:
a. In instances where a box interfaces directly with only one end user equipment, the box shall be located as close as possible to that equipment without interfering with any other systems or violating any other requirements specified herein. If a box interfaces directly with two or more end user equipments, the box shall be so located as to keep the majority of local cable (see 3.19) runs as short as possible. For end
user equipment with local cables that are required to be survivably separated, the boxes that connect these local cables to trunk cables shall be located in different compartments, except for the case where the interconnection box and the equipment are in the same compartment. In
this situation, both cables may be run from the equipment to the same box.
b. Boxes shall be located in spaces protected from the weather whenever possible. Boxes shall not be installed in voids or inaccessible spaces. If mounting the box within gun or missile blast areas cannot be avoided, it shall be located clear of maximum deflection or whip of bulkheads and deck plating.
c. Unless otherwise approved by NAVSEA, box location shall provide ready access and entry for maintenance. No part of the box should be at a height greater than 7 feet above the deck, with the preferred maximum height being 5 feet. There shall be a minimum of 2 feet of clearance in front of the box.
4.1.3 Interconnection box mounting. Interconnection boxes shall be mounted in accordance with methods specified in 5.1.
4.1.3.1 Bonding, grounding, and shielding. Boxes that contain active fiber optic components, such as switches or transceivers, shall be bonded, grounded, and shielded in accordance with MIL-STD-1310. Bonding, grounding, and shielding inside the box shall be in accordance with MIL-STD-1310 and MIL-STD-461.
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