Comtech EF Data SDM-300A - Manual (Page 92)

SDM-300A Satellite Modem Revision 6
External Connections MN/SDM300A.IOM
4–14
4.1.6 Alarms Connector and Pinouts (J10)
The alarm connector provides Form C contact closures for alarm reporting. The two Form C
summary fault contacts are Modulator and Demodulator.
The alarm connection is a 9-pin female D connector (J10) located on the rear panel of the modem.
Screw locks are provided for mechanical security on the mating connector. Refer to Table 4-10 for
pinout information.
Table 4-10. Alarms Connector and Pinouts (J10)
Pin # Signal Function Name
1 Alarm 1 is faulted NO
2 COM
3 Alarm 1 is not faulted NC
4 Alarm 2 is faulted NO
5 COM
6 Alarm 2 is not faulted NC
7 Alarm 3 is faulted NO
8 COM
9 Alarm 3 is not faulted NC
• Alarm 1 = Not used
• Alarm 2 = TX
• Alarm 3 = RX
To obtain a system summary alarm, connect all the Form C contacts in parallel.
4.1.7 RF Output Connector (CP1)
CP1 is a BNC connector for the transmit IF signal. The output impedance is 75 Ω (50Ω optional),
and the output power level is -5 to -30 dBm, with +5 to -20 dBm optional. In normal operation, the
output will be a {O}QPSK or BPSK modulated result of the Data I/O connector between 50 and
180 MHz, in 1 Hz steps.
4.1.8 RF Input Connector (CP2)
CP2 is a BNC connector for the receive IF signal. The input impedance is 75 Ω (50Ω optional). For
normal operation, the desired carrier signal level should be between -30 and -55 dBm. Signals
between 50 and 180 MHz are selected and demodulated to produce clock and data at the Data I/O
connector.