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SDM-300L3 Satellite Modem
Specifications
14.15.1
D&I Primary Data Interfaces
When configured for D&I operation, multiplexing/demultiplexing follows the IBS satellite
frame structure and ESC features, but with the following changes:
•
•
14.15.2
D&I Framing
The IBS satellite framing/deframing is applied only to selected time slots of the data's
G.704 terrestrial structure.
14.16
IDR (Optional with Overhead Card)
Primary Data Rates Supported
G.703
Engineering Service Channel
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
Faults and Alarms
Backward Alarms Supported
Backward Alarm Inputs
Backward Alarm Outputs
Demodulator Fault Relay
Deferred Maintenance Alarm
Accepts and outputs primary data through the 50-pin connector using G.703. The
data rate must be at T1 or E1 rates only.
This includes additional links for Drop Data Out and Insert Data In. Clock
recovery, dejitter, and encoding/decoding are performed as before.
1544 kbps SD, RD
2048 kbps SD, RD
2 duplex ADPCM 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 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 in with every 8th bit, aligns with frame bit d8
4 input, 4 output
1KΩ 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 faulted, 15V maximum, 20 mA
maximum
14–38
Revision 0
MN/SDM300L3.IOM
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