MIL-PRF-24623C
3.5.7 Axial compressive loading (for cable splice only). When tested in accordance
with 4.7.2.7, a post test visual examination of the splice shall reveal no indication
of cracking, splitting, tearing or buckling of the splice.
3.5.8 Crush (for cable splice only). When tested in accordance with 4.7.2.8, a
visual examination of the splice enclosure shall reveal no cracking, splitting, or
other effect to permit environmental penetration. Splice enclosure deformation shall
not be considered as splice failure. The splice shall meet the requirements of 3.6.2
during and after the test.
3.5.9 Impact. When tested in accordance with 4.7.2.9 and 4.7.2.9.1, the impact
resistive property of the splice shall be determined by post test visual examination
of the splice enclosure. This examination shall reveal no cracking, splitting or
other defect to permit environmental penetration. Splice enclosure deformation shall
not be considered as splice failure. Splice shall meet the requirement of 3.6.2 after
impact test.
3.5.10 Vibration. When tested in accordance with 4.7.2.10, the splices shall
exhibit no visual evidence of loosening of parts, relative motion between splice and
cable parts, nor any other damage which can produce physical distortion or wear and
may result in fatigue of the mechanical parts or failure of the splice operation. The
splice shall meet the requirements of 3.6.4 during the test.
3.5.11 Mechanical shock. When tested in accordance with 4.7.2.11, the splices shall
not be damaged and there shall be no loosening of parts. The splice shall meet the
requirements of 3.6.4 during the test and 3.6.2 after the test.
3.5.12 Fiber pull out force. When tested in accordance with 4.7.2.12, the minimum
fiber to fiber splice pullout strength shall be 14.0 N (3.1 pounds). The splice shall
meet the optical requirements specified in 3.6.2 during and after the test.
3.5.13 Cable pull out force. The minimum cable to cable splice closure pullout
strength shall be 73.5 kg for splices attaching to the strength members of the cable
or 9 kg for splices attaching directly to fiber cable components (see 4.7.2.13). The
splices shall show no evidence of cable jacket damage, cable clamp failure, cable to
splice seal damage, distortion from bending of splice parts or cable disengagement
from the clamp. The splice shall meet the requirements of 3.6.2 during and after the
test.
3.6 Optical requirements. Splices shall meet the optical requirements as specified
herein. Unless otherwise specified, the center wavelength for all measurements shall
be 1300 +/- 20 nm.
3.6.1 Insertion loss. The initial insertion loss for tunable splices shall not
exceed 0.6 dB (untuned) and 0.2 dB (tuned). The initial insertion loss for fixed
splices shall be 0.6 dB. Unless otherwise specified (see 3.1), the insertion loss
shall not exceed 0.9 dB at any time during testing for the splice (see 4.7.3.1).
3.6.2 Change in optical transmittance. When measured in accordance with 4.7.3.2,
the change in optical transmittance during or after any specified environmental or
mechanical requirement shall be not greater than 0.30 dB.
3.6.3 Return loss. When measured in accordance with 4.7.3.3, return loss (see
6.4.15) shall not be greater than -30 dB.
3.6.4 Discontinuity. When measured in accordance with 4.7.3.4, no discontinuity
(see 6.4.10) shall occur. A discontinuity is considered to be a reduction of signal
strength of 0.30 dB or more for a duration of 50 microseconds or more.
3.6.5 Crosstalk. When tested in accordance with 4.7.3.5, the signal power level, or
the sum of the power levels in the passive output channel or channels, shall be below
the output signal level of the active channel by not less than 50 dB.
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