Comtech EF Data CDM-840 - Manual (Page 49)

CDM-840 Remote Router Revision 2
Rear Panel Connections MN-CDM840
3–9
3.2.3.4 ‘ALARMS’ Interface Connector
Pin 2 of this connector provides an analog signal to aid antenna pointing or for
driving step-track equipment. The analog signal will be zero volts when the unit is
not locked to a carrier. When locked to a carrier the analog signal will be 1 volt for
Es/No values less than or equal to -4.69 dB, or 10 volts for Es/No values greater than
or equal to 20dB as depicted in the following chart:
Table 3-3. ALARMS Connector Pinouts
PIN # SIGNAL FUNCTION NAME
1 GROUND GND
9 EXT CARRIER OFF EXT-OFF
2 ES/NO VOLTAGE (0 TO 10 VOLTS) ES/NO
10 RESERVED +3.3V INPUT CMOS LEVEL N/C
3 NO CONNECTION N/C
11 NO CONNECTION N/C
4 UNIT FAULT UNIT-COM
12 UNIT FAULT (ENERGIZED, NO FAULT) UNIT-NO
5 UNIT FAULT (DE-ENERGIZED, FAULTED) UNIT-NC
13 TX TRAFFIC TX-COM
6 TX TRAFFIC (ENERGIZED, NO FAULT) TX-NO
14 TX TRAFFIC (DE-ENERGIZED, FAULTED) TX-NC
7 RX TRAFFIC RX-COM
15 RX TRAFFIC (ENERGIZED, NO FAULT) RX-NO
8 RX TRAFFIC (DE-ENERGIZED, FAULTED) RX-NC
Connector Type Name Direction
Type ‘D’ 15-pin male ALARMS In/Out