Comtech EF Data SDM-100A - Manual (Page 33)

SDM-100A Satellite Modem Installation
Rev. 0 2–7
2.4.3 Faults (J7)
The Fault connector on the modem is used to interface FORM-C contact closures for the
purpose of fault reporting. There are three FORM-C summary fault contacts:
• Modulator
• Demodulator
• Common equipment
For further discussion on the monitored faults, refer to Chapter 3.
To obtain a system summary fault, connect all FORM-C contacts in parallel.
The fault interface is provided on a 9-pin female D connector. Screw locks are provided
for mechanical security on the mating connector.
Pin # Name Function
1 NO Common Equipment is OK
2 COM
3
NC Common Equipment is FAULTED
4 NO Modulator is OK
5 COM
6
NC Modulator is FAULTED
7 NO Demodulator is OK
8 COM
9
NC Demodulator is FAULTED
Note: A connection between the Common (COM) and Normally Open (NO) contacts
indicates no fault.
2.4.4 TX IF Output (CP1)
This is the transmit IF connector. The output impedance is 75 Ω (50 Ω optional), and the
output power level is -5 to -30 dBm, in 0.1 dB steps.
For normal operation, the output will be a QPSK modulated result of the DATA I/O
connector, between 50 and 180 MHz.