Specifications

SDM-300L3 Satellite Modem Revision 0
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 50Ω Type N connector for the TX IF signal. In normal operation, the output will
be a QPSK (Optional: OQPSK or 8PSK) or BPSK modulated result of the Data I/O
connector between 950 to 1750 MHz, in 100 Hz steps
3.2.8 External Reference (CP2)
CP2 is a BNC connector for an EXT REF. The input impedance is 75Ω. 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 75Ω, Type F Female connector for an RX IF signal.