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P300H P300 Series Modem Installation and Operating Handbook Page 136
The modes selected by these two menu's are as follows:
NORMAL:96K The normal IDR overhead is used
1XAUDIO:64K The overhead is reduced to 64kbps, the 32kbps defined for Audio ESC channel
2 is not transmitted. The 32kbps for [FAS + Back Alarms + 8K sync ESC channel],
and Audio ESC channel 1 are still transmitted.
NO AUDIO:32K The overhead is reduced to 32kbps, both 32kbps channels defined for ESC audio
are not transmitted. The 32kbps for [FAS + Back Alarms + 8K sync ESC channel]
alone is transmitted.
16k Modes
96K Both Audio ESC channels operate in 16kbps ADPCM mode allowing both audio
ESC's to fit into 32kbps. The 32kbps for [FAS + Back Alarms + 8K sync ESC
channel] is transmitted first, followed by 32kbps defined for Audio ESC 1, now
containing both Audio ESCs 1 & 2 using 16kbps ADPCM. These are followed
by the 32kbps for Audio ESC channel 2 which is unused and may be defined
for use by the Aux port providing either a spare 32kbps for external BER testing,
or for the use of the internal BER Tester (in both cases for possible traffic quality
monitoring).
64K Both Audio ESC channels operate in 16kbps ADPCM mode allowing both Audio
ESC's to fit into the 32kbps allocated to audio ESC channel 1. The overhead is
64kbps comprising 32kbps for [FAS + Back Alarms + 8K sync ESC channel] plus
32kbps containing the two 16kbps ADPCM audio channels. The final 32kbps
defined for Audio ESC channel 2 is not transmitted.