Comtech EF Data SDM-9000 - Manual (Page 50)

Installation SDM-9000 Satellite Modem
2–8 Rev. 4
2.4.7 Fault (J7)
The fault connector is used to provide Form C contact closures for fault reporting. The
three Form C summary fault contacts are:
• Transmit faults
• Receive faults
• Common equipment faults
Refer to Chapter 4 for a discussion of faults monitored. To obtain a system summary
fault, connect all the Form C contacts in parallel
The fault interface connection is a 9-pin female D connector located on the rear panel of
the modem. Screw locks are provided for mechanical security on the mating connector.
Signal Function Name Pin #
Common equipment is OK NO 1
Common COM 2
Common equipment is faulted NC 3
Transmit is OK NO 4
Common COM 5
Transmit is faulted NC 6
Receive is OK NO 7
Common COM 8
Receive is faulted NC 9
Note: A connection between the common (COM) and normally open (NO) contacts
indicates no fault.