Q-Flex Satellite Modem Installation and Operating Handbook
10-8
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
Ω
, with 7dBm to -16dBm set independently from the front panel.
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
ESCs may be dropped in favour of 32 or 64kbps access to the channel by the Aux port.