IBM 3708 Planning And Installation page 223

Bulk Cable Requirements
Overall Shield
Outside Jacket
Capacitance
Dielectric Strength
Conductor Requirements
Material
Individual Conductor
Shield
Number of Individual
Shielded Conductors
Insulation
Voltage Rating
Drain Wires
Connector Requirements for 3708 End
Shield must be polyester-backed aluminum. foil with
continuous drain wire. Conductive surface and drain
wire out. 100% coverage with minimum 50%
overlap.
PVC
Total capacitance as measured from any lead to all
other leads and shields tied together must not exceed
40 PF /Ft maximum.
Wire in the finished cable must withstand, without
breakdown at room ambient temperature, a
minimum. test voltage of 300 V 50/60 Hz rms for 1
minute between individual conductors and between
individual conductors and shields.
#24 A WG 7/32 stranded, tinned copper
Polyester-backed aluminum foil outside to ensure
contact with central drain wire
4
Solid polypropylene
30 V at 60 degrees C
Both central and outside, #24 A WG, 7x32 stranded
Connector Housing 25-pin D connector having tin-plated metal housing
with grounding indents
Contacts
Shell
Ferrule
D-2
3708 Planning and Installation
Male pins
Metal with captivated retainer screws long enough to
be grasped and turned with the fingers
Split ring, aluminum