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500-19-54 Dual Channel Telephone Interface
Issue 1.2 Trilogy Communications Limited Page 19 of 19
7. 500-19-00 TELEPHONE INTERFACE CARD SET-UP
7.1 Introduction
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
7.2 Ring Out
This function that is pre-set by R33 controls the ring level heard at the caller’s earpiece when
dialling in.
7.3 Panel Ring
This function that is pre-set by R29 controls the ring level at the panel when receiving an
incoming call:-
7.4 Panel 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: