Technical Specifications

C-3

RS-232-D pin assignments

The asynchronous RS-232-D port on the ISDN modem, labeled RS232, is a standard DB-25 female connector. The ISDN modem asynchronous port pin assignments, shown in the following table, conform to standard definitions for data communications equipment (DCE).

Pin #

Pin Name

Signal Direction

 

 

 

 

 

 

1

Shield Ground (GND)

 

 

 

2

Send Data (SD)

To ISDN modem

 

 

 

3

Receive Data (RD)

From ISDN modem

 

 

 

4

Request to Send (RTS)

To ISDN modem

 

 

 

5

Clear to Send (CTS)

From ISDN modem

 

 

 

6

Data Set Ready (DSR)

From ISDN modem

 

 

 

7

Signal Ground (GND)

 

 

 

8

Carrier Detect (DCD)

From ISDN modem

 

 

 

18

Local Loopback

From ISDN modem

 

 

 

20

Data Terminal Ready (DTR)

To ISDN modem

 

 

 

21

Remote Loopback

To ISDN modem

 

 

 

22

Ring Indicator (R)

From ISDN modem

 

 

 

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