Alarms (Db-15M); Pmsi Connector, Db-9F; Table 3-12. Alarm Interface Connector Pinouts; Table 3-13. Pmsi (Pre-Mapped Symbol Interface) Connector Pinouts - Comtech EF Data CDM-625A Installation And Operation Manual

CDM-625A Advanced Satellite Modem
Rear Panel Connectors and Pinouts
3.2.3.2

Alarms (DB-15M)

3.2.3.3

PMSI Connector, DB-9F

Table 3-13. PMSI (Pre-Mapped Symbol Interface) Connector Pinouts

Unit alarms are provided on this 15-pin Type 'D' male connector.

Table 3-12. Alarm Interface Connector Pinouts

Pin #
Name
(L-R)
1 GND
9 EXT-OFF
2 AGC
10 N/A
3 RX-Q
11 RX-I
4 UNIT-COM
12 UNIT-NO
5 UNIT-NC
13 TX-COM
6 TX-NO
14 TX-NC
7 RX-COM
15 RX-NO
8 RX-NC
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.
Pin #
Description
(R-L)
1 Ground
6 Spare (No connection)
2 Spare (No connection)
PMSI symbol clock – RS485 -
7
PMSI symbol clock – RS485 +
3
PMSI LSB – RS485 -
8
PMSI LSB – RS485 +
4
PMSI MSB – RS485 -
9
PMSI MSB – RS485 +
5
3–13
Signal Function
Ground
EXT Carrier OFF
AGC Voltage (Rx signal level, 0 to 10 Volts)
Spare (No connection)
Rx Q Channel (Constellation Monitor)
RX I Channel (Constellation Monitor)
Unit Fault
Unit Fault (Energized, No Fault)
Unit Fault (De-energized, No Fault)
Tx Traffic
Tx Traffic (Energized, No Fault)
Tx Traffic (De-energized, No Fault)
Rx Traffic
Rx Traffic (Energized, No Fault)
Rx Traffic (De-energized, No Fault)
Direction
In/Out
In/Out
In/Out
In/Out
In/Out
In/Out
Revision 0
MN-CDM625A
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