500-19-54 Dual Channel Telephone Interface
7.500-19-00 TELEPHONE INTERFACE CARD SET-UP
7.1Introduction
The 700-19-00 interface card acts as a buffer between the hybrid that connects directly to the telephone line and the audio and data circuits of the Commander matrix. Each card interfaces one telephone line to one matrix port. The card is largely digital, but there are three level controls that although factory pre-set, can be varied if necessary
7.2Ring Out
This function that is pre-set by R33 controls the ring level heard at the caller’s earpiece when dialling in.
7.3Panel Ring
This function that is pre-set by R29 controls the ring level at the panel when receiving an incoming call:-
7.4Panel DTMF
This function that is pre-set by R28 controls the level of DTMF on the local panel’s loudspeaker when dialling out from the panel:
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