Specifications

SDM-300L3 Satellite Modem Revision 0
Specifications MN/SDM300L3.IOM
15–36
15.13.5 Turbo AUPC
Self monitoring AUPC is provided.
15.14 IBS (Optional with Overhead Card)
Primary Data Rates Supported
G.703
EIA-422
V.35
1544 kbps SD, RD
2048 kbps SD, RD
N x 64 kbps SD, RD (up to 2048 kbps)
N x 64 kbps SD, RD (up to 2048 kbps)
Engineering Service Channel
Earth Station-to-Earth Station
Channel
EIA-232 data synchronous at 1/512 of the primary data
EIA-232 data asynchronous at 1/2000 of the primary data
EIA-232 Specification
Circuit Supported SD, ST, RD, RT, DSR
(RTS, CTS connected by break-out panel)
Amplitude (RD, RT, CTS, ASR)
True: 10V, ± 5V
False: -10V, ± 5V
Amplitude (SD, ST, RTS) True: Minimum +1V
False: Maximum -11V
Impedance
5000, ± 2000Ω < 2500 pF
Faults and Alarms
Satellite Backward Alarm 1 (per IESS-309)
Receive BWA Output Enabled onto terrestrial secondary alarm
15.14.1 IBS Primary Data Interfaces
G.703 Accepts and outputs primary data through the 50-pin connector using G.703. The
data rate must be at T1 or E1 rates only.
EIA-422 Accepts and outputs primary data through the 50-pin connector using EIA-422.
The data rate must be at data rate multiples of 64 kbps up to a maximum of
2048 kbps.
V.35 Accepts and outputs primary data through the 50-pin connector using EIA-422.
The data rate must be at data rate multiples of 64 kbps up to a maximum of
2048 kbps.
15.14.2 IBS Clock and Dejitter
Performs clock and data recovery on the G.703 format. Clock dejitter and data
encoding/decoding is done as with the IDR configuration.
15.14.3 IBS Framing
Multiplexes/demultiplexes the primary data in compliance with the standard IESS-309
overhead ratio of 1/15 (4 overhead bytes per 60 data bytes) and provides the rate
exchanged transmit clock to the modulator portion of the base modem.