Comtech EF Data SDM-300A - Manual (Page 91)

SDM-300A Satellite Modem Revision 6
External Connections MN/SDM300A.IOM
4–13
4.1.5 Auxiliary 1 Connector and Pinouts (J9)
The auxiliary 1 (AUX 1) connector provides:
• MOD and DEMOD (TTL) faults
• Satellite
clock
• Satellite I&Q
• Automatic Gain Control (AGC) output voltage
The faults are open collector levels that indicate a modulator or demodulator failure. A logic “1”
indicates the faulted condition. AGC_OUT is a programmable voltage, 0 to 10V, for a receive
signal level between -25 and -60 dBm. AUX 1 connection is a 9-pin female D connector (J9)
located on the rear panel of the modem. Screw locks are provided for mechanical security on the
mating connector. Refer to Table 4-9 for pinout information.
Table 4-9. AUX 1 Connector and Pinouts (J9)
Pin # Signal Function Name
1 Satellite Clock - SAT_CLK-
2 No Connection NC
3 Satellite Clock + SAT_CLK+
4 MODULATOR TTL Fault MDFLTTTL
5 Ground GRN
6 RX Q Channel Eye RX_Q
7 DEMODULATOR TTL Fault DFLTTTL
8 RX I Channel Eye RX_I
9 Agc Output AGC