Paradise Datacom P300 Series Installation & Operating Handbook page 138

Change, Tx/Rx, Service, Custom, IDR, Overhead Menu
If are selected the following further prompt appears
Change, Tx/Rx, Service, Custom, IDR, O/H 16k Menu
The modes selected by these two menu's are as follows:
The normal IDR overhead is used
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.
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
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).
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.
P300H P300 Series Modem Installation and Operating Handbook
IDR o/h: [?] 1=Normal:96k 2=1xAudio:64k
3=No Audio:32k 4=16k ADPCM modes
IDR o/h: [?] 1=96k:2x16k-Audio+32k-BER
2=64k:2x16k-Audio only
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