Comtech EF Data SDM-300A - Manual (Page 260)

SDM-300A Satellite Modem Revision 6
Open Network Operations MN/SDM300A.IOM
10–4
10.2.1 IBS Specifications
Table 10-1. IBS Specifications
Parameter Specification
Composite Data Rates Supported N x 64 kbps from 64 kbps to 2048 kbps, with 1/15 overhead
Primary Data Circuits Supported G.703 1.544 Mbps SD, RD
G.703 2.048 Mbps SD, RD
EIA-422/449, V.35
Engineering Service Channel
Earth Station-to-Earth Station
Channel
EIA-232 TD, RD, DSR, RTS
Asynchronously sampled at 1/2000 of the primary channel data rate
Data rate is 1/512 of primary data if an EIA-232 clock is provided
Octet Clock Pulse Data rate ÷ 8
Octet high with every 8th bit
EIA-232 Specification
Circuit Supported RD, TD, DSR, RTS, CTS
Amplitude (RD, RTS) True: 14V ± 11V
False: -14V ± 11V
Amplitude (TD, DSR, CTS) True: 11V ± 2V
False: -11V ± 2V
Impedance 5000 ± 2000Ω < 2500 pF
Baud Rate Max: 1/2000 times the data rate
Faults
Modulator Fault Open collector output, 15V maximum, 20 mA maximum current sink
Fault is open circuit
Demodulator Fault Open collector output, 15V maximum, 20 mA maximum current sink
Fault is open circuit
Backward Alarms Primary and secondary alarms
Backward Alarm Output Form C contacts available