MIL-STD-2042-4B(SH)
4. GENERAL REQUIREMENTS
4.1 Location of optical fiber cable runs. Optical fiber cable shall be located to avoid physical interference with electric cables and equipment and to minimize risk of battle damage. Cable runs shall be located so that optical fiber cables will not be disturbed by disassembly or removal of machinery, including the removal of bolted or welded equipment removal plates. Optical fiber cables may be run in cableways with electric power and signal cables. However, optical fiber cables should not be installed in cableways with armored cables unless no feasible alternative routing exists. If optical fiber cables must be installed in the same cableways as armored cables, additional precautions must be taken during installation to prevent mechanical damage (see 4.2). Optical fiber cable shall not
be run through bilge areas unless such routing is necessary to provide survivability through redundant signal paths. In such cases, suitable cable protection shall be provided (see 4.1.7). Where the installing activity (see 3.14) is responsible for the design of the fiber optic topology cableways, it shall be as specified herein.
4.1.1 Main fore and aft cable runs.
4.1.1.1 Surface ships. Main fore and aft cable runs shall be routed as follows. Main fore and aft cable runs shall be located port and starboard and high and low in the ship. The lower cableways shall be through the machinery spaces and corresponding platform decks, while the upper cableways shall be under the main deck. This location of cableways is designed to provide a quadrangular pattern to allow maximum athwartship and vertical separation of cables for systems requiring alternate signal paths for reliability and survivability. The athwartship separation shall be achieved by locating the cable runs not greater than 1.8 m (6 ft) from the most outboard structure (2.4 m (8 ft) from curved structure) on the respective sides of the ship. The vertical separation shall be achieved by separating the cable runs by not less than two decks. Where two deck separation is not possible due to ship geometry, a minimum of one deck separation shall be provided. The longitudinal separation distance between vertical or athwartship cable runs shall be not less than 19.7 m (65 ft) in the hull and 12.1 m (40 ft) in the superstructure.
4.1.1.2 Submarines. Main fore and aft cable runs shall be located near the inner surface of the pressure hull in a quadrangular pattern to allow maximum athwartship and vertical separation of cables for systems requiring alternate signal paths for reliability and survivability.
4.1.2 Vertical cable runs. Vertical cable runs shall be organized on the
basis of the fore and aft or athwartship separation of main cable runs and equipment
served.
4.1.3 Optical fiber local cable runs. Optical fiber local cable runs shall be routed from the end user equipment (see 3.10) to the interconnection box that services that equipment. Systems that have redundant local cables shall have these local cables routed to separate interconnection boxes, wherever practical, unless otherwise specified in the drawings. These separate interconnection boxes shall be separated in the athwartship direction to the maximum extent possible and vertically by not less than two decks or by a horizontal distance of 19.7 m (65 ft) in the hull or 12.2 m (40 ft) in the superstructure. Redundant local cable runs shall be survivably separated as described in 4.1.1 except when they are within 18.2 m (60
ft) of the equipment.
4.1.4 Cable runs with special requirements.
4.1.4.1 Control from more than one location. Where equipment is controlled from more than one location, the cables from each location shall be routed in separate cableways.
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