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Selecting an Interface Cable 101
Interface Cable Specifications
This section describes the specifications for each interface supported on the Eicon 1530.
If you plan to construct your own VHSI cables, be sure to observe the guidelines given below.
Cable Specifications
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
Interface Standard Compatibility
V.24 CCITT V.24 Signaling
CCITT V.28 Electrical
CCITT X.21bis Electrical and signaling
EIA RS-232-C Electrical and signaling
ISO 2110 Connector type for the DCE side of a V.24 VHSI
Modem Cable
V.35 CCITT V.28 Some signals for electrical
CCITT V.35 Some signals for electrical and signaling
ISO 2593 Connector type for the DCE side of a V.35 VHSI
Modem Cable