Rear Panel Connections Revision 4
CDM-760 Advanced High-Speed Trunking Modem MN-CDM760
3–7
3.2.2.2 J2 | REDUNDANCY Connector, DB-9F
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
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 Signal Function Signal Type
5 MDM_COM_OUT_ENA Enable “Mdm_Comm_Out” signal LVTTL Output
9 12VOLT_OUT +12 Volts at 300 ma 12V 300 ma
4 ONLINE
Commands modem to be Online/Offline
(Use pull-up on Modem side input)
LVTTL Input
8 SER_DATA Fault Serial Data Signal from modem LVTTL Output
3 TX_IF_MUTE_B
Capability to mute modem’s Tx IF (Low=Mute)
(Use pull-up on Modem side input)
LVTTL Input
7 SER_CLK Fault Serial Clock Signal 64KHz LVTTL Output
2 MDM_COM_IN
UART comm to modem from controller
(9600 to115.2BUAD)
LVTTL Input
6 MDM_COM_OUT
UART comm. from modem to controller
(9600 to115.2BUAD)
LVTTL Output
1 GND Chassis Ground Gnd
3.2.2.3 J3 | REMOTE Connector, DB-9M
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.
The connector pinouts are as follows:
Pin # Description Direction (I/O)
1 Ground –
6 EIA-485 Receive Data B * I
2 EIA-232 Transmit Data O
7 EIA-485 Receive Data A * I
3 EIA-232 Receive Data I
8 EIA-485 Transmit Data B O
4 Reserved - do not connect to this pin –
9 EIA-485 Transmit Data A O
5 Ground –
* Use for 2-wire EIA-485 operation
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