Comtech EF Data CDM-625A - Alarms (DB-15 M); PMSI Connector (DB-9 F)

CDM-625A Advanced Satellite Modem MN-CDM625A
Rear Panel Connectors and Pinouts Revision 4
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 ––