Selecting an Interface Cable
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Wire Gauge, Grounding, and Pairing
• Use 28 AWG 7-strand wire with 0.020-0.028 insulation.
• The chassis must be grounded both by a drain wire and by the braid; both must be
connected to the connector case and shell at each end of the cable. The braid must
be connected through its full circumference.
• Wires identified under the heading ‘Twisted Pairs’ must be paired. If you do not install
twisted pairs correctly, the cable will not work.
Type of Connectors
The VHSI port accepts a high density 36-pin male cable connector. The types of
connectors used on the interface-specific end of the cable are as follows:
• V.35: Type M
• V.24: DB25
• V.36/RS-449: DB37
• EIA-530: DB25
• X.21:DB-15
