Comtech EF Data SDM-300L3 - Manual (Page 340)

SDM-300L3 Satellite Modem Revision 0
Specifications MN/SDM300L3.IOM
14–34
14.13 Asynchronous Overhead Specification (Optional)
The operator can select EIA-232 or EIA-485 for both the transmit and receive
asynchronous overhead data type.
Primary Data Rates Supported
G.703
EIA-422
V.35
EIA-232
1544 kbps SD, RD
2048 kbps SD, RD
9.6 kbps to 2.048 Mbps
9.6 kbps to 2.048 Mbps
9.6 kbps to 120 kbps
Asynchronous ESC
Maximum Data Rate
1.875% of primary data rate
Channel Interface EIA-232
2-wire EIA-485 half-duplex / 4-wire EIA-485 full-duplex
Connector 25-pin D on breakout panel (UB-300)
Available Baud Rates 110, 150, 300, 600, 1200, 2400, 4800, 9600, 19200, 38400 bit/s
Protocol Format 5, 6, 7, or 8 data bits
Even, odd, or no parity
1 or 2 stop bits
EIA-232 Specification
Circuits Supported
SD, RD (RTS, CTS connected by break-out panel)
Amplitude (RD, CTS) 0 / Space / ON (True): 10V, ± 5V
1 / Mark / OFF (False): -10V, ± 5V
Amplitude (SD, RTS) 0 / Space / ON (True): Minimum +1V
1 / Mark / OFF (False): Maximum -11V
Impedance 5000, ± 2000 Ω < 2500 pF
EIA-485 Specification
Circuits Supported
SD, RD (differential pair)
Amplitude -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
Target Power Levels
-5 to -30 dBm (+5 to -20 dBm for high power option)
Target Eb/N0 Level 3.2 to 16.0 dB in 0.1 dB steps
Tracking Rate 0.5 to 6.0 dB/min in 0.5 dB/min steps
Local and Remote Carrier Loss Setting
(local has priority) Maximum - go to highest power output level
Nominal - go to preprogrammed output level
Hold - no action
AUPC Test Modes 2047 test pattern for remote BER monitoring
Remote baseband loopback test