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P300H P300 Series Modem Installation and Operating Handbook Page 187
Audio Ports
Pin Number Description
38 Tx Audio Channel 1 in A
39 Tx Audio Channel 1 in B
40 Tx Audio Channel 2 in A
41 Tx Audio Channel 2 in B
34 Rx Audio Channel 1 out A
35 Rx Audio Channel 1 out B
36 Rx Audio Channel 2 out A
37 Rx Audio Channel 2 out B
50 Ground
All ports are 600
, with levels set independently from the front panel of +7dBm to -16dBm. Audio is
encoded as 32kbps ADPCM (or 16kbps ADPCM in some custom modes)
The Audio ports may be used in two applications:
In IBS modes if set to emulate a P1348/P1448 Audio/Data mux card, the ESC ports provide the equivalent
of the two audio ports on the P1348/P1448 (ie can transmit 64kbps=2 audio channels, or 128kbps=2 audio
channels plus 64 kbps data from main data port).
In IDR modes these are used to access the IDR Audio ESC channels. One or both Audio ESC's may be
dropped in favour of 32 or 64kbps access to the channel by the Aux port.