3com 520 User Manual
Interface Cable Characteristics
B-7
WAN Port Connecting Cable – V.35/V.36
Support
The WAN port terminates with a 25-way D-type
female connector. The port can be configured to
support V.36 signalling characteristics at data transfer
rates up to 48 Kbps. 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.
7
Pin
Links
3Com end
pin no.
(25-way male)
Signal name
Client end
pin no.
(34-way MRAC
connector)
2
Transmit Data (TXD 103)
P
3
Receive Data (RXD 104)
R
4
Request To Send (RTS
105)
C
5
Clear To Send (RTS 106)
D
6
Data Set Ready (DSR 107)
E
7
Signal Ground
(102)(Clear To Send)
B
8
Data Carrier Detect (DCD
109)
F
11
Signal Ground
13
Serial Clock Transmit B
(SCTB 114)
AA
14
Transmit Data B (TXDB
103)
S
15
Serial Clock Transmit A
(SCTA 114)
Y
16
Receive Data B (RXDB
104)
T
17
Serial Clock Receive A
(SCRA 115)
V
19
Serial Clock Receive B
(SCRB 115)
X
20
Data Terminal Ready (DTR
108)
H
Pin
Links
3Com end
pin no.
(25-way male)
Signal name
Client end
pin no.
(34-way MRAC
connector)
Rc.bk : RCAPPB.FRM Page 7 Thursday, July 10, 1997 9:53 AM