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SDM-300A Satellite Modem
2.3.5
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 2-10 for pinout information.
Refer to
alarm, connect all the Form C contacts in parallel.
2.3.6
RF Output Connector (CP1)
CP1 is a BNC connector for the transmit IF signal. The output impedance is 75Ω (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 QPSK (Optional: OQPSK) or BPSK modulated
result of the Data I/O connector between 50 and 180 MHz, in 1 Hz steps.
2.3.7
RF Input Connector (CP2)
CP2 is a BNC connector for the receive IF signal. The input impedance is 75Ω (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.
Rev. 4
Table 2-10. Alarms Connector and Pinouts (J10)
Pin #
Signal Function
1
Alarm 1 is faulted
2
3
Alarm 1 is not faulted
4
Alarm 2 is faulted
5
6
Alarm 2 is not faulted
7
Alarm 3 is faulted
8
9
Alarm 3 is not faulted
•
Alarm 1 = Not used
•
Alarm 2 = TX
•
Alarm 3 = RX
Chapter 5
for a discussion of monitored alarms. To obtain a system summary
Name
NO
COM
NC
NO
COM
NC
NO
COM
NC
Installation
2–19
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