2 alarms (db-15m), 3 pmsi connector (db-9f) – Comtech EF Data CDM-625A User Manual
Page 99
CDM-625A Advanced Satellite Modem
MN-CDM625A
Rear Panel Connectors and Pinouts
Revision 3
3–15
3.2.3.2 Alarms (DB-15M)
Unit alarms are provided on this 15-pin Type ‘D’ male connector.
Table 3-11. Alarm Interface Connector Pinouts
(L>R)
Pin #
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 3-12. PMSI (Pre-Mapped Symbol Interface) Connector Pinouts
(R>L)
Pin # Description
Direction
5 PMSI MSB – EIA-485 (+)
In/Out
9
PMSI MSB – EIA-485 (–)
In/Out
4 PMSI LSB – EIA-485 (+)
In/Out
8
PMSI LSB – EIA-485 (–)
In/Out
3 PMSI symbol clock – EIA-485 (+)
In/Out
7
PMSI symbol clock – EIA-485 (–)
In/Out
2 Spare (No connection)
––
6
Spare (No connection)
––
1 Ground
––