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2 j2 | redundancy connector, db-9f, 3 j3 | remote connector, db-9m – Comtech EF Data CDM-760 User Manual

Page 55

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Rear Panel Connections

Revision 2

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