Comtech EF Data SDM-9000 - Manual (Page 56)

Installation SDM-9000 Satellite Modem
2–14 Rev. 4
2.4.9 AUX 1 (J9)
The Auxiliary 1 (AUX 1) connector provides:
• TTL faults
• External high stability reference
• AGC output voltage
The faults are open collector levels to indicate a modulator or demodulator failure. A
logic 1 indicates the faulted condition. The signals are primarily used in operating a
protection switch.
The external high stability reference clock input is 5, 10, or 20 MHz.
AGC-OUT is the voltage for a receive signal level between -25 and -50 dBm.
The AUX 1 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 #
Ground GND 5, 6, 8
External reference EXT–REF 2
Transmit fault MDTTLFLT 4
Receive fault DMTTLFLT 7
AGC output
(Receive input, IF level) AGC–OUT 1