MIL-DTL-24643C
4.9.13.1 Specimen. The test specimen shall be a 328-foot (~100-meter) length of cable. Depending on the test
equipment used, such as a network analyzer or hand held link tester, it may be necessary to terminate each end with
an RJ-45 connector. If RJ-45 connectors are used, their losses shall be taken into consideration for the
measurement.
4.9.13.2 Measurement. All measurements shall be in accordance with ANSI/TIA/EIA-568-B.2. Measurements
shall be made as follows:
a. Baseline. Two baseline measurements of electrical characteristics shall be made on the specimen prior to
initiating the stress resistance test. The first set of baseline measurements shall be taken while the cable is still on its
original shipping reel. The second set of baseline measurements shall be taken after the cable is unspooled from its
reel, but prior to performance of the stress tests.
b. Operating tensile load. Electrical characteristic measurements of the specimen shall be recorded in the
stressed condition simulating operating tensile load at 24-hour intervals and in the unstressed condition at the
completion of the operating tensile load test.
c. Long-term minimum bend. Electrical characteristic measurements of the specimen shall be recorded in the
stressed condition simulating long-term minimum bend upon completing the initial wraps on the fixture and after a
24-hour period.
d. Cable compression. Electrical characteristic measurements of the specimen shall be recorded in the
stressed condition simulating cable compression upon completing the initial banding of the cable and after a 24-hour
period.
e. Cable re-spooling. Electrical characteristic measurements of the specimen shall be recorded upon
completion of cable re-spooling.
4.9.13.3 Operating tensile load. This test subjects the cable specimen to tensile and bending forces. The test
specimen shall be installed onto a tensile loading fixture similar to figure 20. The diameter of the sheaves shall be
12.0 inches. A minimum preload of 10 pounds per cable strand shall be placed on the cable. The load shall be
increased to 112 pounds per cable strand and held for 72 hours.
4.9.13.3.1 Measurement. Electrical characteristic measurements shall be made in accordance with 4.9.13.2.b.
4.9.13.4 Long-term minimum bend. This test subjects the cable specimen to multiple bends at the long-term
minimum bend radius of the cable. The test specimen shall be installed onto a bend fixture similar to figure 21. The
outside diameter (OD) of the mandrels in figure 21 shall be 6.75 inches. Twenty-six 90-degree bends shall be
formed in the specimen. Each bend shall occur at approximately a 3-foot interval from the preceding bend and shall
be formed to the long-term bend radius of the cable. The specimen shall be maintained on the fixture for 24 hours.
4.9.13.4.1 Measurement. Electrical characteristic measurements shall be made in accordance with 4.9.13.2.c.
4.9.13.5 Cable compression. This test subjects the cable specimen to multiple compression loads along its
length. This test shall be performed while the specimen is still installed on the bend fixture. Install cable straps at
32-inch intervals in the approximate locations as indicated in figure 22. The straps shall be installed in accordance
with MIL-STD-2003-4, figures 4C21-4C23.
4.9.13.5.1 Measurement. Electrical characteristic measurements shall be made in accordance with 4.9.13.2.d.
4.9.13.6 Cable re-spooling. This test subjects the cable specimen to the twisting stresses which occur during
re-spooling. At the completion of tests 4.9.13.3 through 4.9.13.5.1, the test specimen shall be un-banded and
removed from the bend fixture. Using the reel on which the cable originally came from the manufacturer, coil the
test specimen onto the reel in a smooth and uniform manner. While re-spooling, maintain sufficient tension on the
specimen to permit tight adherence to the reel.
4.9.13.6.1 Measurement. Electrical characteristic measurements shall be made in accordance with 4.9.13.2.e.
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