MIL-DTL-28781E
3.3.2 Capacitance unbalance.
3.3.2.1 Pair-to-pair capacitance unbalance. The pair-to-pair capacitance unbalance for a 1000-foot
(304.8-meter) length of completed cable measured at 1,000±100 Hz shall not exceed the following:
Less than 16 pairs
100 picofarads (pF) max individual
16 or more pairs
40 pF rms
For lengths of cable other than 1,000 feet (304.8 meters), the value shall be converted to 1000-feet
(304.8 meter) values by dividing the unbalance of the length measured by the square root of the ratio of
the length measured to 1,000 feet. In cables with 52 pairs and less and in each group of multigroup
cables, the unbalances to be considered shall be:
a. Between pairs adjacent in a layer.
b. Between pairs in centers of four pairs or less.
c.
Between pairs in adjacent layers, when the number of pairs in the inner (smaller) layer is six or
less. In this, the center is counted as a layer.
3.3.2.2 Pair-to-shield capacitance unbalance. The pair-to-shield direct capacitance unbalance for a
1,000-foot (304.8-meter) length of completed cable, when measured at 1,000±100 Hz, shall conform to
the following: (a) The conductor-to-shield capacitances of the two conductors of the pair under test shall
balance within 6 percent of the value of the lowest conductor-to-shield capacitance of the pair; and (b)
the maximum deviation of any pair difference shall not exceed the average of the differences of all pairs
of the cable by more than 500 pF. NOTE: "Pair difference" is the difference between the conductor-to-
shield capacitances of the two conductors of the pair.
3.3.3 Continuity. In each length of cable, the conductors shall be free from grounds (contacts
between a conductor and shield), short circuits, and open circuits. The shielding shall be free from open
circuits.
3.4 Cable put-up. Cable shall be put-up on reels in lengths-per-reel as specified in the solicitation
(see 6.2).
3.5 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or
environmentally preferable materials should be used to the maximum extent possible provided that the
material meets or exceeds the operational and maintenance requirements, and promotes economically
advantageous life cycle costs.
3.6 Workmanship. The cable shall be free of kinks, abrasions, and cracked or peeled surfaces. The
cable shall be a uniform and consistent product and shall be free from defects that adversely affect the
serviceability of the product.
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