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CDM-750 Advanced High-Speed Trunking Modem
Rear Panel Connections
3.2.2
Utility Connector Group
3.2.2.1
J1 | ALARM Connector, DB-15M
The connector pinouts are as follows:
Pin # Name
1 GND
9
EXT-OFF
2 AGC (NOT AVAILABLE)
10
N/C
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 15‐pin Type 'D' male (DB‐15M) J1 | ALARM connector provides the unit
alarms interface.
Signal Function
Ground
Ext Carrier Off, active low.
Capability to mute modem's Tx IF (Low=Mute) (Has internal pull-up in the
Modem). Compatible with LVTTL or relay pull down.
AGC Voltage (Rx signal level, 0 to 10 volts, monotonic)
No Connection
Rx Q Channel (Constellation monitor)
Rx I Channel (Constellation monitor)
Unit Fault
Unit Fault (Energized, No Fault)
Unit Fault (De-energized, Faulted)
Tx Traffic
Tx Traffic (Energized, No Fault)
Tx Traffic (De-energized, Faulted)
RX Traffic
Rx Traffic (Energized, No Fault)
Rx Traffic (De-energized, Faulted)
3–8
Revision 2
MN-CDM750
Direction (I/O)
Gnd
I
O
–
O
O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
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