Clear-Com CS-702 - Manual (Page 15)

C S - 7 0 2 T W O - C H A N N E L M A I N S T A T I O N
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6. Announce Relay Contact Terminals: The announce relay contacts are
available on a 1/4” jack. The contact description is as follows:
Tip--- C --- Common
Ring--- N/C --- Normally Closed Contact
Sleeve--- N/O --- Normally Open Contact
7. Program Input Connector: The program input is an XLR-3F. It is an
electronically balanced (differential) input. Wiring is as follows:
Pin #1 --- Ground
Pin #2 --- -Audio
Pin #3 --- +Audio
8. Program Gain Switch: The program input gain switch is located next to
the program input connector. In the mic position the input will accept a
low-impedance dynamic microphone and gives a gain of 41dB from input
to the Party Line.
In the line position the input presents a balanced high impedance and
gives a -16dB gain from input to Party Line.
Caution: These servicing instructions are for use by qualified service
personnel only. To avoid electric shock, do not perform any
servicing other than that contained in the operating
instructions unless you are qualified to do so.