3Com Router 3000 Series Manual page 23

3Com Router Release Notes for V1.20
Table 13 lists the V.25 DCE cable pinouts.
V.25 DCE Cable Pinouts
Table 13
DB28 Signal
6 GND
7 MODE0
21 GND
19 RXD+
1 TXD+
23 CTS+
13 RTS+
25 DSR+
27 DTR+
15 TXCE+
3 TXC+
17 RXC+
11 DCD+
22 LL
Shielding shell Core-shielding
layer
V.35 DTE Cable
The V.35 DTE cable has a 34PIN (male) connector at the network end. Figure 9
illustrates the V.35 DTE cable.
Figure 9 V.35 DTE Cable
DB28 Male
Enlarged A side
Table 14 lists the V.35 DTE cable pinouts.
V.35 DTE Cable Pinouts
Table 14
DB28 Signal
6 GND
10 MODE_DCE
7 MODE0
8 MODE1
21 GND
1 TXD+
2 TXD-
19 RXD+
Signal direction
<-->
<-->
<-
->
<-
->
<-
->
->
->
<-
->
<-
<-->
Label
Signal direction
<-->
<-->
->
->
<-
23
DB25 (female) Signal
7 Circuit GND
1 Shield GND
2 TXD
3 RXD
4 RTS
5 CTS
20 DTR
6 DSR
17 RXC
15 TXC
24 ETC
8 DCD
18 LTST
Shielding shell Core-shielding
layer
V.35 Male
Enlarged B side
34PIN (male) Signal
A Circuit GND
B Shield GND
P SD+
S SD-
R RD+