MIL-STD-2042-2B(SH)
Step 1 - Verify that the procedures of Method 2G1 or Method 2H1 of this standard practice have been completed for all BOF cables entering the interconnection box.
Step 2 - Open the equipment cover and visually examine the BOF tubes for cuts or kinks before continuing.
Step 3 - CAUTION: Do not exceed a bend diameter of 13 cm (5 in) for the BOF
tubes. BOF tubes may collapse at diameters less than 13 cm (5 in).
Choose a BOF cable and route BOF tube number one to the nearest side of the box. Route the BOF tube along the side and mark the tube approximately 200 mm (8 in) from the far corner of the box. Successively route and mark each BOF tube within the BOF cable (staggering each tube approximately 44 mm (1.7 in) shorter than the previous tube is recommended). Using the tube cutter, cut each tube at the mark. Visually verify that the end of the tube is cut
perpendicular to the tube length. Clean the end of each BOF tube with a wipe dampened with alcohol and blow dry as necessary.
NOTE: Small BOF tube bend diameters may not allow 12 and 18-fiber BOF bundles to be blown through the tube bend. Maximize BOF tube bend diameters to the greatest extent practicable.
NOTE: BOF tube bend diameters less than 18 in will negatively impact the blowing distances achievable for 12 and 18-fiber BOF bundles.
NOTE: BOF tubes may be extended outside of the interconnection box (to enlarge the tube bend diameter) during fiber installation to improve blowing performance.
Step 4 - CAUTION: Do not overheat the BOF tubes. Prolonged exposure of the BOF tubes to temperatures above 160oC (320oF) may damage them. Discontinue heating of the sleeve and allow the BOF tubes to cool before reheating if the tubes show any signs of bubbling or swelling.
Slide the heat shrink tubing with the tube identification onto each BOF tube of the BOF cable approximately 100 mm (4 in) from the tube end. Holding the heat gun approximately 100 mm (4 in) away from each BOF tube, shrink the shrink tubing.
Step 5 - Form the BOF tubes into a flat group and route the group along the side of the box as follows (see figure 2I2-1):
a. Snap the BOF tubes into a 7-tube clip or lace the tubes flat to a small plastic or metal bar. Place the longest BOF tube to the rear of the box with each successively shorter tube placed to the front of the previous tube (if the BOF tube lengths are staggered).
b. Route the group of BOF tubes along the side of the box securing the group to the box mounting brackets using self-clinching straps.
Step 6 - Repeat steps 3, 4 and 5 for each BOF cable entering the interconnection box.
NOTE: The tubes of each successive BOF cable should be shortened approximately 50 mm (2 in) compared to the previous BOF cable routed on the same side of the box.
NOTE: Spacers may be used to separate tube groups to facilitate access. Step 7 - Observe the connection chart or other approved drawing. Identify BOF
tubes that will not have fibers installed and end seal them in
accordance with Method 2J1 of this standard.
2I2-2 METHOD 2I2
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