MIL-PRF-85045/19A
Concentricity:
> 0.65.
Jacket material: The overall jacket shall be composed of a low halogen, low
smoke, low toxicity polymer material.
Mass per unit length:
< 640.0 kg/km.
Short term minimum bend diameter: Eight times the cable outer diameter.
(The
short term minimum bend diameter is to be used in all environmental and
mechanical tests which specify a cable minimum bend diameter.)
Long term minimum bend diameter: Sixteen times the cable outer diameter.
Minimum continuous length: The minimum continuous length of all cables shall be
not less than 0.5 km (546.81 yards). If lengths less than 0.5 km are specified
in the purchase order, Quality Conformance Inspection shall be performed on test
specimens not less than 0.5 km in length from which the purchase order lengths
are cut.
PERFORMANCE REQUIREMENTS:
Optical properties:
Maximum attenuation rate:
4.5 dB/km at 850 ± 20 nm, 2.0 dB/km at 1300 ± 20 nm
for type MM fiber.
1.0 dB/km at 1310 ± 20 nm and 1550 ± 20 nm for type SM
fiber.
Bandwidth:
Fiber with a minimum bandwidth of 500 Mhz-km at 1300 nm shall be used
(multimode cables only).
Bandwidth is not specified at 850 nm.
Change in optical transmittance: Measurements to be made at 1300 ± 20 nm. A
minimum of eight fibers shall be monitored for change in optical transmittance.
A minimum of 2 fibers shall be monitored in the inner ring of OFCCs. A minimum
of 2 fibers shall be monitored in the middle ring of OFCCs. A minimum of 4
fibers shall be monitored in the outer ring of OFCCs. The fibers monitored in
each ring shall be randomly selected, but different fibers shall be monitored in
each test sample. For shock testing only four fibers are required to be
monitored (one in the inner ring, one in the middle ring and two in the outer
ring of the OFCCs).
Crosstalk:
Applicable.
Mechanical properties:
Tensile loading and elongation:
Applicable, tensile loading > 3300 N.
Operating tensile loading:
Applicable.
Cyclic flexing: 500 cycles at +25OC ± 2OC and 100 cycles at -28OC ± 2OC. Change
in optical transmittance measurements are to be made every 100 cycles for the 500
cycle exposure and every 25 cycles for the 100 cycle exposure. Each change in
optical transmittance measurement shall be performed with the test specimen in
the same position in the test cycle. The cycling may be halted to perform the
change in optical transmittance measurement.
Crush:
Applicable.
Cable twist bending: 500 cycles at +25OC ± 2OC and 100 cycles at -28OC ± 2OC.
Change in optical transmittance measurements are to be made every 100 cycles for
the 500 cycle exposure and every 25 cycles for the 100 cycle exposure. Each
change in optical transmittance measurement shall be performed with the test
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