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SDM-300A Satellite Modem
C.8
Asynchronous Overhead Specification (Optional)
The operator can select EIA-232 or EIA-485 for both the TX and RX asynchronous
overhead data type.
G.703
EIA-422
V.35
EIA-232
Maximum Data Rate
Channel Interface
Connector
Available Baud Rates
Protocol Format
Circuits Supported
Amplitude (RD, CTS)
Amplitude (SD, RTS)
Impedance
Circuits Supported
Amplitude
Target Power Levels
Target E
/N
Level
b
0
Tracking Rate
Local and Remote Carrier Loss Setting
(local has priority)
AUPC Test Modes
Rev. 4
Primary Data Rates Supported
1544 kbit/s SD, RD
2048 kbit/s SD, RD
9.6 kbit/s to 2.048 Mbit/s
9.6 kbit/s to 2.048 Mbit/s
9.6 kbit/s to 120 kbit/s
Asynchronous ESC
1.875% of primary data rate
EIA-232
2-wire EIA-485 half-duplex
4-wire EIA-485 full-duplex
25-pin D on breakout panel (UB-300)
110, 150, 300, 600, 1200, 2400, 4800, 9600, 19200,
38400 bit/s
5, 6, 7, or 8 data bits
Even, odd, or no parity
1 or 2 stop bits
EIA-232 Specification
SD, RD (RTS, CTS connected by break-out panel)
True: 10V, ± 5V
False: -10V, ± 5V
True: Minimum +1V
False: Maximum -11V
5000, ± 2000Ω < 2500 pF
EIA-485 Specification
SD, RD (differential pair)
-7 to +12V from either A or B terminals to ground
Mark (logic 1): A is negative with respect to B
Space (logic 0): A is positive with respect to B
1.5 to 5V differential between A and B terminals
AUPC Specification
-5 to -30 dBm (+5 to -20 dBm for high power option)
3.2 to 16.0 dB in 0.1 dB steps
0.5 to 6.0 dB/min in 0.5 dB/min steps
Maximum - go to highest power output level
Nominal - go to preprogrammed output level
Hold - no action
2047 test pattern for remote BER monitoring
Remote baseband loopback test
Specifications
C–45
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