SDM-300L3 Satellite Modem
Revision 1
Connector Pinouts
MN/SDM300L3.IOM
3–13
3.2.6 Alarms
Connector and Pinouts (J10)
The alarm connector provides Form C contact closures for alarm reporting. The two Form C
summary fault contacts are Modulator and Demodulator.
The alarm connection is a 9-pin female D connector (J10) located on the rear panel of the
modem. Screw locks are provided for mechanical security on the mating connector. Refer to
Table 3-9 for pinout information.
Table 3-9. Alarms Connector and Pinouts (J10)
Pin #
Signal Function
Name
1
Alarm 1 is faulted
NO
2
COM
3
Alarm 1 is not faulted
NC
4
Alarm 2 is faulted
NO
5
COM
6
Alarm 2 is not faulted
NC
7
Alarm 3 is faulted
NO
8
COM
9
Alarm 3 is not faulted
NC
•
Alarm 1 = Not used
•
Alarm 2 = TX
•
Alarm 3 = RX
3.2.7
RF Output Connector (CP1)
CP1 is a 50
Ω
Type N connector for the TX IF signal. It operates between 950 to 1750 MHz,
in 100 Hz steps at power levels between 0 and –40 dBm in 0.1 dBm steps.
3.2.8
External Reference (CP2)
CP2 is a BNC connector for an EXT REF. The input impedance is 75
Ω
. For normal
operation, the desired carrier signal level is
≥
0 dB. EXT REF frequencies are EXT 1,
EXT 5, EXT 10, and EXT 20 MHz.
3.2.9
RF Input Connector (CP3)
CP3 is a 75
Ω
, Type F Female connector for an RX IF signal.
Optional: Type N Female connector for an RX IF signal.
