CDM-600 Satellite Modem Revision 7
Open Network Operations MN/CDM600.IOM
9–4
9.4 IDR
Primary Data Rates Supported
G.703
EIA-422 (Replaces 8K Overhead)
V.35 (Replaces 8K Overhead)
1544 kbps SD, RD
2048 kbps SD, RD
6312 kbps SD, RD
8448 kbps SD, RD
Engineering Service Channel
ESC Audio 2 duplex ADPCM channels
Audio Encoding CCITT G.721
Audio Interface Type 600 transformer-balanced 4-wire
Audio Input Level Nominal Input : 0dBm0 (-3dBm, 600)
Adjustment range: -6 to +8 dB, 2 dB steps
Audio Output Level Adjustment range: -6 to +8 dB, 2 dB steps
Audio Filtering Internal 300 to 3400 Hz input and output
ESC Data Interface Type EIA-422
ESC Data Rate 8 kbps, also 64 kbps if ADPCM audio is not used
ESC Data Circuits
Supported
SD, ST, RD, RT, Octet in, Octet out
Data Signal Phasing Per EIA-449, data changes on the rising clock transition, is
sampled on the falling clock edge
Octet Timing Octet high with every 8th bit, aligns with frame bit d8
Faults and Alarms
Backward Alarms
Supported
4 input, 4 output
Backward Alarm Inputs 1 k pull up to ground, set high to activate.
Backward Alarm Outputs Form C Relay, N/O, N/C, Com