MIL-STD-2042-1 Fiber Optic Cable Topology Installation Standard Methods For Naval Ships Cables Part 1 Of 7 PartsThis standard provides detailed methods for fiber optic cable selection, handling, marking, and repair.

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MIL-STD-2042-1B(SH)

4. GENERAL REQUIREMENTS

4.1 Cables. Fiber optic cables for Naval shipboard application shall be in accordance with MIL-PRF-85045.

4.1.1 Cable selection. Cables selected shall be those referenced in ship specifications, ship installation drawings, contract drawings, or other approved drawings as specified in the contract or by the cognizant Government activity. Substitute cables shall not be used without authorized approval (see 3.6). In those instances where the installing activity (see 3.19) is responsible for determining the correct type and size cable for a specific application, the fiber optic cables shall be selected in accordance with MIL-PRF-85045. Fibers shall be in accordance with

MIL-PRF-49291, either type SM (single mode) or type MM (multimode) as required by the

system.

4.1.2 Spare optical fibers. The number of spare optical fibers shall be in accordance with the ship specification and system drawings. Spare fibers are

provided in both trunk cables and local cables that penetrate bulkheads or decks (see

3.20 and 3.32).

4.1.3 Cable storage and handling.

4.1.3.1 Cable storage. Cables shall be stored in a dry place protected from the weather and limited to a temperature range of not less than -40 degrees Celsius (oC) [-40 degrees Fahrenheit (oF)] nor greater than +70oC (+158oF). It is recommended that cables be limited to a maximum temperature +30oC (+86oF). A cable that has been in storage for less than one year may be installed if a visual inspection of the

cable shows no mechanical damage that would impair the watertight integrity of the cable's outer sheath or the integrity of the interior components. A conventional optical fiber cable that has been in storage for one year or longer may be installed if it passes the visual inspection (see Method 6A1 in Part 6 of this standard practice), and if the optical attenuation (see Method 6B1 in Part 6 of this standard practice) is less than the value specified. A BOF cable that has been in storage for one year or longer may be installed if it passes the visual inspection (see Method

6A1 in Part 6 of this standard practice), and if a ball bearing with a minimum outer diameter of 4.5 mm will pass through each BOF tube within the cable. Cables shall be stored on reels with minimum diameters of 24 times the cable outside diameter, or coiled so that the bend diameter shall be not less than 24 times the cable outside diameter. BOF cables shall not be stored where they may be exposed to direct sunlight, or on reels placed on their sides. Bare ends of stored cables shall be sealed against moisture using heat shrink end caps as specified herein (see 5.1). Terminated cables shall be sealed against moisture using connector dust covers (for multiple terminus connectors), plastic caps or heat shrink end caps as specified herein (see 5.1).

4.1.3.2 Cable handling. During handling, the conventional optical fiber cable and the BOF cable shall be protected from crushing, kinks, twists, and bends that violate the minimum short term bend diameter of the cable (see 3.21). The minimum short-term bend diameter of conventional optical fiber cable is eight times the cable outside diameter. The minimum short-term bend diameters of BOF cable are 0.13 m (5 in) for single tube BOF cable, 0.46 m (18 in) for seven-tube BOF cable and 1.0 m (39 in) for nineteen-tube BOF cable. It is recommended that cables not be handled in ambient temperatures at or below 36oF (2oC) (see Part 4 of this standard practice).

4.1.4 Cables entering interconnection boxes or other equipment. Cables shall enter interconnection boxes or other equipment in accordance with the methods in Part

2 of this standard practice.

4.1.5 Cable penetrations. The passing of cables through decks and bulkheads shall be in accordance with the methods in Part 3 of this standard practice.

4.1.6 Cable installation and protection. Cables shall be installed in the cableways and protected in accordance with Part 4 of this standard practice.