MIL-STD-2042-2B(SH)
TABLE 2F1-I. Equipment and materials (continued).
Description |
Quantity |
Scissors |
1 |
Fiber, BOF single fibers or fibers from a BOF bundle |
As required |
Furcation Unit (per A-A-59729 or fabricated per Method 2E1 of this standard) |
As required |
Straight tube coupler (AA59731-U-8 or AA59731-U-8E) |
As required |
Tee tube coupler (AA59731-T-8 or AA59731-T-8E) |
As required |
BOF tubing (8.0 mm OD) |
As required |
Wipes (NAVSEA DWG 6872811-18 or equal) |
As required |
Colored tubing or tape |
As required |
NOTE: Previously used BOF tube couplers may not adequately seal to BOF
tubes. When installing BOF cabling, always use new BOF tube couplers.
NOTE: Before mating BOF tubes to BOF tube couplers, clean the end of each
BOF tube with a wipe dampened with alcohol and blow dry as necessary.
3.2.2 Tube preparation. The BOF tubes shall be prepared as described below, unless otherwise approved by the Naval Surface Warfare Center (see 1.1.1), before installation of the BOF furcation unit.
NOTE: Refer to the connection chart or other approved drawing to determine where to use straight tube couplers and where to use tee tube couplers.
Step 1 - Insert the individual fibers or bundle into the tube coupler. Slide the tube coupler over the fibers to the BOF tube. Slide the tube coupler onto the BOF tube and firmly seat the tube within the tube coupler.
Step 2 - Using the scissors, trim back the individual fibers or fiber bundle that exit the tube coupler to approximately 66 cm (26.0 in) longer than the required length.
NOTE: The exact length of the BOF fiber or fiber bundle depends upon the equipment and the fiber routing. This length may be determined by measuring the distance required to route the fiber from the end of the BOF tube to the furthermost connection point in the equipment plus approximately 130 mm (5 in).
Step 3 - For tubes containing BOF bundles only:
NOTE: For eighteen fiber bundles, fibers of the same color are contained in each 6-fiber subunit. During the installation of the furcation unit, it is necessary to know the 6-fiber subunit that each fiber comes from. One method to uniquely mark the fibers of each 6-fiber subunit is to make the fibers of each subunit a slightly different length.
a. Optional step for 18-fiber bundles: Using the scissors, cut off approximately 100 mm (4 in) of the fibers of one 6-fiber subunit. Then cut off approximately 200 mm (8 in) of the fibers in a different 6-fiber subunit.
b. Mark the bundle jacket approximately 25 mm (1.0 in) from the tube coupler.
2F1-2 METHOD 2F1
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