3com 520 User Manual

 

 

 

 

 

The WAN port terminates with a 25-way D-type 

 

female connector. The port can be configured to 

 

support V.11 signalling characteristics at data transfer 

 

rates up to 2.048 Mbps. The WAN port connecting 

 

cable is not supplied with the unit. The following 

 

signalling characteristics should be observed when 

 

purchasing or fabricating a suitable cable.

 

 

 

 

 

(25-way male)

 

 

 

 

(15-way male 

 

D-type connector)

 

2

 

Transmit Data A (TXDA)

 

2

 

3

 

Receive Data (RXDA)

 

4

 

7

 

Signal Ground (Receive 

 

Data)

 

8

 

12

 

Signal Ground

 

13

 

Indicate B (INDB)

 

12

 

14

 

Transmit Data B (TXDB)

 

9

 

15

 

Indicate A (INDA)

 

5

 

16

 

Receive Data B (RXDB)

 

11

 

17

 

Clock A (CLKA)

 

6

 

19

 

Clock B (CLKB)

 

13

 

23

 

Control B (CTRLB)

 

10

 

24

 

Control A (CTRLA)

 

3

Rc.bk : RCAPPB.FRM  Page 5  Thursday, July 10, 1997  9:53 AM