Comtech EF Data CDM-625A Installation And Operation Manual page 665

CDM-625A Advanced Satellite Modem
Appendix P
P.4 IDR
G.703
EIA-422 (Replaces 8K Overhead)
V.35 (Replaces 8K Overhead)
ESC Audio
Audio Encoding
Audio Interface Type
Audio Input Level
Audio Output Level
Audio Filtering
ESC Data Interface Type
ESC Data Rate
ESC Data Circuits Supported
Data Signal Phasing
Octet Timing
Backward Alarms Supported
Backward Alarm Inputs
Backward Alarm Outputs
Primary Data Rates Supported
1544 kbps SD, RD
2048 kbps SD, RD
6312 kbps SD, RD
8448 kbps SD, RD
Engineering Service Channel
2 duplex ADPCM channels
CCITT G.721
600Ω transformer-balanced 4-wire
Nominal Input : 0dBm0 (-3dBm, 600Ω)
Adjustment range: -6 to +8 dB, 2 dB steps
Adjustment range: -6 to +8 dB, 2 dB steps
Internal 300 to 3400 Hz input and output
EIA-422
8 kbps, also 64 kbps if ADPCM audio is not used
SD, ST, RD, RT, Octet in, Octet out
Per EIA-449, data changes on the rising clock transition, is
sampled on the falling clock edge
Octet high with every 8
th
Faults and Alarms
4 input, 4 output
1 kΩ pull up to ground, set high to activate.
Form C Relay, N/O, N/C, Com
P–5
bit, aligns with frame bit d8
Revision 0
MN-CDM625A