J2 | Redundancy Connector, Db-9F; J3 | Remote Connector, Db-9M - Comtech EF Data CDM-760 Installation And Operation Manual

Rear Panel Connections
CDM-760 Advanced High-Speed Trunking Modem
3.2.2.2

J2 | REDUNDANCY Connector, DB-9F

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
5 MDM_COM_OUT_ENA
9 12VOLT_OUT
4 ONLINE
8 SER_DATA
3 TX_IF_MUTE_B
7 SER_CLK
2 MDM_COM_IN
6 MDM_COM_OUT
1 GND
3.2.2.3

J3 | REMOTE Connector, DB-9M

The connector pinouts are as follows:
Pin #
1 Ground
6 EIA-485 Receive Data B *
2 EIA-232 Transmit Data
7 EIA-485 Receive Data A *
3 EIA-232 Receive Data
8 EIA-485 Transmit Data B
4 Reserved - do not connect to this pin
9 EIA-485 Transmit Data A
5 Ground
* Use for 2-wire EIA-485 operation
The J2 | REDUNDANCY 9-pin Type 'D' female (DB-9F) connector provides the
1:1 control interface. It provides serial communications to transfer
configuration information from the Primary to the Backup modem, and a
Signal Function
Enable "Mdm_Comm_Out" signal
+12 Volts at 300 ma
Commands modem to be Online/Offline
(Use pull-up on Modem side input)
Fault Serial Data Signal from modem
Capability to mute modem's Tx IF (Low=Mute)
(Use pull-up on Modem side input)
Fault Serial Clock Signal 64KHz
UART comm to modem from controller
(9600 to115.2BUAD)
UART comm. from modem to controller
(9600 to115.2BUAD)
Chassis Ground
The J3 | REMOTE 9-pin Type 'D' male (DB-9M) connector provides the remote
control interface via an M&C computer or terminal device. It is user selectable
for either EIA-232 or EIA-485.
Description Direction (I/O)
–
I
O
I
I
O
–
O
–
3–7
Revision 4
MN-CDM760
Signal Type
LVTTL Output
12V 300 ma
LVTTL Input
LVTTL Output
LVTTL Input
LVTTL Output
LVTTL Input
LVTTL Output
Gnd