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Interface Cable Characteristics
B-5
Interface Cable Characteristics
WAN Port Connecting Cable – V.11/X.21
Support
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.
Pin
Links
3Com end
pin no.
(25-way male)
Signal name
Client end pin
no.
(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