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SDM-300A Satellite Modem
A.1.5.1
IDR Specifications
Refer to Table A-15 for IDR specification.
G.703
ESC Audio
ESC Data (Optional)
Audio Encoding
Audio Interface Type
Audio Input Level
Audio Output Level
Filtering
ESC Data Interface Type
ESC Data Rate
ESC Data Circuits Supported
Data Signal Phasing
Octet Clock Pulse
Backward Alarms Supported
Backward Alarm Inputs
Backward Alarm Outputs
Demodulator Fault Relay
Deferred Maintenance Alarm
Note: A 64 kbit/s data channel may be substituted for the two audio channels.
Rev. 4
Table A-15. IDR Specification
Primary Data Rates Supported
1544 kbit/s
2048 kbit/s
Engineering Service Channel
2 channels at 32 kbit/s duplex ADPCM channel
64 kbit/s duplex data (in place of audio channels)
CCITT G.721
600Ω transformer balanced 4-wire
-20 to +10 dBm for 0 dBm, 1 dB steps
-20 to +10 dBm for 0 dBm, 1 dB steps
Internal 300 to 3400 Hz, input and output
EIA-422
8 kbit/s
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 in with every 8th bit, aligns with frame bit d8
Faults and Alarms
4 input, 4 output
1 kΩ pull up to +5V, set below 2V to clear
Form C Relay, NO, NC, C
NO, C contacts available for backward alarm inputs
Open collector, high impedance IF fault, 15V maximum, 20 mA
maximum
Options
A–49
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