Comtech EF Data SNM-1001 - Manual (Page 28)

SNM-1001 Network Control Modem Installation
Rev. 1 2–7
2.3.3 Faults (J7)
The fault connector on the modem is used to provide FORM-C contact closures for the
purpose of fault reporting. There are three FORM-C summary fault contacts:
•
Modulator
•
Demodulator
•
Common equipment
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 of the mating connector. The pinout of the connector is as
follows:
Pin # Name Function
1 NO Common equipment is not faulted
2 COM
3 NC Common equipment is faulted
4 NO Modulator is not faulted
5 COM
6 NC Modulator is faulted
7 NO Demodulator is not faulted
8 COM
9 NC Demodulator is faulted
Note: A connection between the common (COM) and normally open (NO) contacts
indicates no fault.
2.3.4 TX IF Output (CP1)
CP1 is the transmit IF connector. The output impedance is 75
Ω
. The output power level
is -5 to -30 dBm, in 0.1 dB steps.
In normal operation, the output will be a QPSK modulated result of the DATA I/O
connector, between 50 and 180 MHz.