Utility Connections; J1 | Alarm Connector, Db-15M; J2 | Redundancy Connector, Db-9F - Comtech EF Data CDM-750 Installation And Operation Manual

CDM-750 Advanced High-Speed Trunking Modem
Rear Panel Connectors and Pinouts
3.3

Utility Connections

3.3.1

J1 | ALARM Connector, DB-15M

The connector pinouts are as follows:
Pin # Name
8 RX-NC
15 RX-NO
7 RX-COM
14 TX-NC
6 TX-NO
13 TX-COM
5 UNIT-NC
12 UNIT-NO
4 UNIT-COM
11 RX-I
3 RX-Q
10 N/C
2 AGC (N/A*)
9 EXT-OFF
1 GND
* N/A = Not available
3.3.2

J2 | REDUNDANCY Connector, DB-9F

The J2 | REDUNDANCY connector provides the 1:1 control interface via a 9-pin
Type 'D' female connector. The connector provides serial communications to
transfer configuration information from the Prime to the Backup modem, and a
Fault/Clock signal to signal the switch when a fault occurs. It is intended only for connection to a
CRS-170A or CRS-180 1:1 Redundancy Switch.
The connector pinouts are as follows:
Pin # Name
1 GND
2 MDM_COM_IN
3 TX_IF_MUTE_B
4 ONLINE
5 MDM_COM_OUT_ENA
6 MDM_COM_OUT
7 SER_CLK
8 SER_DATA
9 12VOLT_OUT
The J1 | ALARM connector provides the unit alarms interface via a 15-pin
Type 'D' male connector.
Rx Traffic (De-energized, Faulted)
Rx Traffic (Energized, No Fault)
RX Traffic
Tx Traffic (De-energized, Faulted)
Tx Traffic (Energized, No Fault)
Tx Traffic
Unit Fault (De-energized, Faulted)
Unit Fault (Energized, No Fault)
Unit Fault
Rx I Channel (Constellation monitor)
Rx Q Channel (Constellation monitor)
No Connection
AGC Voltage (Rx signal level, 0 to 10 volts, monotonic)
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.
Ground
Signal Function
Chassis Ground
UART comm to modem from controller
(9600 to115.2BUAD)
Capability to mute modem's Tx IF (Low=Mute) (Use pull-up on Modem
side input)
Commands modem to be Online/Offline
(Use pull-up on Modem side input)
Enable "Mdm_Comm_Out" signal
UART comm. from modem to controller
(9600 to115.2BUAD)
Fault Serial Clock Signal 64KHz
Fault Serial Data Signal from modem
+12 Volts at 300 ma
Signal Function
3–4
Revision 1
MN-CDM750
Direction
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
O
O
–
O
I
Gnd
Type
Gnd
LVTTL Input
LVTTL Input
LVTTL Input
LVTTL Output
LVTTL Output
LVTTL Output
LVTTL Output
12V 300 ma