Comtech EF Data CDM-625 - Alarms (DB-15 M); PMSI Connector, DB-9 F; Table 3-12. Alarm Interface Connector Pinouts

CDM-625 Advanced Satellite Modem Revision 13
Rear Panel Connectors and Pinouts MN-CDM625
3–13
3.2.3.2 Alarms (DB-15M)
Unit alarms are provided on this 15-pin Type ‘D’ male connector.
Table 3-12. Alarm Interface Connector Pinouts
Pin #
(L-R)
Name Signal Function
1 GND Ground
9 EXT-OFF EXT Carrier OFF
2
AGC
AGC Voltage (Rx signal level, 0 to 10 Volts)
10
N/A
Spare (No connection)
3 RX-Q Rx Q Channel (Constellation Monitor)
11
RX-I
RX I Channel (Constellation Monitor)
4
UNIT-COM
Unit Fault
12
UNIT-NO
Unit Fault (Energized, No Fault)
5 UNIT-NC Unit Fault (De-energized, No Fault)
13
TX-COM
Tx Traffic
6
TX-NO
Tx Traffic (Energized, No Fault)
14
TX-NC
Tx Traffic (De-energized, No Fault)
7
RX-COM
Rx Traffic
15
RX-NO
Rx Traffic (Energized, No Fault)
8
RX-NC
Rx Traffic (De-energized, No Fault)
3.2.3.3 PMSI Connector, DB-9F
The PMSI (Pre-Mapped Symbol interface) is a 9-pin Type ‘D’ female
connector. The PMSI is an EIA-485 multidrop bus system, used in tandem
with Carrier-in-Carrier (CnC), where one device transmits, and all other
devices on the multidrop bus are configured to receive.
Table 3-13. PMSI (Pre-Mapped Symbol Interface) Connector Pinouts
Pin #
(R-L)
Description Direction
1
Ground
–
6
Spare (No connection)
–
2
Spare (No connection)
–
7
PMSI symbol clock – RS485 -
In/Out
3
PMSI symbol clock – RS485 +
In/Out
8
PMSI LSB – RS485 -
In/Out
4
PMSI LSB – RS485 +
In/Out
9
PMSI MSB – RS485 -
In/Out
5
PMSI MSB – RS485 +
In/Out