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SDM-300A Satellite Modem
A.1.5.3
IBS Specification s
Refer to Table A-17 for IBS specifications.
Parameter
Composite Data Rates Supported
Primary Data Circuits Supported
Earth Station-to-Earth Station
Channel
Octet Clock Pulse
Circuit Supported
Amplitude (RD, RTS)
Amplitude (TD, DSR, CTS)
Impedance
Baud Rate
Modulator Fault
Demodulator Fault
Backward Alarms
Backward Alarm Output
Rev. 4
Table A-17. IBS Specifications
N x 64 kbit/s from 64 kbit/s to 2048 kbit/s, with 1/15 overhead
G.703 1.544 Mbit/s SD, RD
G.703 2.048 Mbit/s SD, RD
EIA-422/449, V.35
Engineering Service 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
Data rate ÷ 8
Octet high with every 8th bit
EIA-232 Specification
RD, TD, DSR, RTS, CTS
True: 14V ± 11V
False: -14V ± 11V
True: 11V ± 2V
False: -11V ± 2V
5000 ± 2000Ω < 2500 pF
Max: 1/2000 times the data rate
Faults
Open collector output, 15V maximum, 20 mA maximum current sink
Fault is open circuit
Open collector output, 15V maximum, 20 mA maximum current sink
Fault is open circuit
Primary and secondary alarms
Form C contacts available
Specification
Options
A–53
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