Dte Cable - 3Com Router 3000 Series Manual

3Com Router Release Notes for V1.20
V.35 DCE Cable Pinouts (continued)
Table 15
DB28 Signal
15 TXCE+
16 TXCE-
3 TXC+
4 TXC-
17 RXC+
18 RXC-
11 DCD+
22 LL
Shielding shell Core-shielding
layer
X.21 DTE Cable
The X.21 DTE cable has a DB15 (male) connector at the network end. Figure 11
illustrates the X.21 DTE cable.
Figure 11 X.21 DTE Cable
Table 16 lists X.21 DTE cable pinouts.
Table 16 X.21 DTE Cable Pinouts
DB28 Signal
6 GND
10 MODE_DCE
9 MODE2
21 GND
13 RTS+
14 RTS-
23 CTS+
24 CTS -
19 RXD+
20 RXD-
1 TXD+
2 TXD -
17 RXC+
18 RXC -
Shielding shell Core-shieldin
g layer
Signal direction
->
->
->
->
<-
?
->
<-
<-->
Signal direction
<-->
<-->
->
->
<-
<-
<-
<-
->
->
?
<-
<-->
25
34PIN (female) Signal
V SCR+
X SCR-
Y SCT+
AA SCT-
U SCTE+
W SCTE-
F RLSD
J LL
Core-shielding Shielding shell
layer
DB15 (male) Signal
8 Circuit GND
1 Shield GND
3 Control+
10 Control -
5 Indication+
12 Indication -
4 Receiver+
11 Receiver+
2 Transmit+
9 Transmit-
6 Timing+
13 Timing -
Core-shielding Shielding shell
layer