Alarms (Db-15M); Pmsi Connector (Db-9F) - 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 3-12. PMSI (Pre-Mapped Symbol Interface) Connector Pinouts
Unit alarms are provided on this 15-pin Type 'D' male connector.
Table 3-11. Alarm Interface Connector Pinouts
(L>R)
Name
Pin #
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.
(R>L)
Description
Pin #
PMSI MSB – EIA-485 (+)
5
PMSI MSB – EIA-485 (–)
9
PMSI LSB – EIA-485 (+)
4
8 PMSI LSB – EIA-485 (–)
PMSI symbol clock – EIA-485 (+)
3
PMSI symbol clock – EIA-485 (–)
7
2 Spare (No connection)
6 Spare (No connection)
1 Ground
3–15
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
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MN-CDM625A
Revision 4