Utility, Connector, Group – Comtech EF Data CDM-760 User Manual
Page 54
Rear Panel Connections
Revision 2
CDM-760 Advanced High-Speed Trunking Modem
MN-CDM760
3–6
3.2.2 Utility Connector Group
3.2.2.1 J1 | ALARM Connector, DB-15M
The J1 | ALARM 15-pin Type ‘D’ male (DB-15M) connector provides the unit
alarms interface.
The connector pinouts are as follows:
Pin # Name
Signal Function
Direction (I/O)
1 GND
Ground
Gnd
9
EXT-OFF
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.
I
2 AGC (NOT AVAILABLE) AGC Voltage (Rx signal level, 0 to 10 volts, monotonic)
O
10
N/C
No Connection
–
3 RX-Q
Rx Q Channel (Constellation monitor)
O
11
RX-I
Rx I Channel (Constellation monitor)
O
4 UNIT-COM
Unit Fault
I/O
12
UNIT-NO
Unit Fault (Energized, No Fault)
I/O
5 UNIT-NC
Unit Fault (De-energized, Faulted)
I/O
13
TX-COM
Tx Traffic
I/O
6 TX-NO
Tx Traffic (Energized, No Fault)
I/O
14
TX-NC
Tx Traffic (De-energized, Faulted)
I/O
7 RX-COM
RX Traffic
I/O
15
RX-NO
Rx Traffic (Energized, No Fault)
I/O
8 RX-NC
Rx Traffic (De-energized, Faulted)
I/O