MIL-DTL-13777/5D
TABLE II. Design data Continued.
DESIGN DATA
Type designation
S521235
Figure number
17
Total wires
26 Twisted Pairs
Number of conductors & AWG #
52/#20
Insulation
Minimum average thickness
0.015"
Spark test voltage
3000
Inspection test voltage
1500
Cabling
Layer 1
(a) Number of wires
6 (3 twisted pairs)
(b) AWG #
#20
Layer 2
(a) Number of wires
18 (9 twisted pairs)
(b) AWG #
#20
Layer 3
Filler
(a) Number of wires
28 (14 twisted pairs)
(b) AWG #
#20
(c) Maximum lay
10.0"
Sheath
Number of layers
2
Total thickness minimum
0.117"
Minimum OD cable
1.210"
Maximum OD cable
1.280"
1/ Two twisted quads and 15 singles.
2/ Three shielded, twisted pairs. Maximum twist lay of 3.5" for quads and 3.0" for pairs.
3/ Letter "S" designates shielded construction.
4/ Four shielded, twisted pairs with maximum twist lay of 3.0 inches and 5 shielded singles.
5/ Shielded pairs AWG #18 with 3.00" maximum lay twist
6/ Two shielded, twisted pairs and one shielded single.
7/ Shielded, twisted triple.
8/ 8 Prs. Twisted/shielded, 6 shielded., 15 unshielded.
9/ 8 Prs. Twisted/shielded.
10/ 6 Singles shielded., 15 unshielded.
11/ One shielded, twisted triple and 7 shielded singles.
12/ Three shielded, twisted pairs and four shielded singles.
13/ Unshielded, twisted quad.
* Cold Bend Torque 30 ft/lbs.
14/ Two (2) Coaxials
(a) Inner conductor:
#27 AWG stranded, 7 strands each
#35 AWG annealed (copper clad) steel wire,
dc resistance/1000 ft at 20°C 180 ohms max.
(b) Core:
Extruded polyethylene per L-P-590, Type II,
Grade 7 diameter 0.097" ± 0.004"
(c) Outer conductor:
Single braid, #38 AWG tinned copper wire, maximum diameter 0.118"
(d) Outer insulation:
Extruded polyamide, minimum average thickness 0.005", max OD 0.136". Color code one
(1) each black and white, striped.
(e) Electrical tests:
Capacitance
20.5± 2 uuf/ft.
Attenuation (maximum)
13 db/100 ft. @ 400 mc
Impedance
73 ± 5 ohms.
Insulation resistance between outer conductors per 1000 ft using
a potential of 200 V. dc min.
10 megohms min.
15/ Forty (40) single conductors
(a) Conductor
#20 AWG
16/ 2 Twisted triplets 2 coaxial Sh.
17/ 15 Prs. Tw. & Sh., 4 Quads. Tw & Sh.; All #16
18/ 4 Quads & 3 pairs.
19/ 12 pairs. 2 fillers.
12
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