Nortel Secure Router 4134 Installation Manual page 111

Figure 36
DCE X.21 serial cable
Table 55
DCE X.21 serial cable description
Pin 1 P1 signal
1 TXD+
14 TXD–
2 TXCE+
15
TXCE–
5
RXD+
18
RXD–
8
RTS+
9 RTS–
11 CTS+
10 CTS–
26 GND
Shield
3 TXC+
4 RXC+
6 DCD+
7
DTR+
12 DSR+
13 LL
16
TXC–
17 RXC–
19 DCD–
20
DTR–
21
MODE2
22
MODE1
Note
Twisted
pair
Twisted
pair
Twisted
pair
Twisted
pair
Twisted
pair
No connect
No connect
No connect
No connect
No connect
No connect
No connect
No connect
No connect
No connect
GND
No connect
Nortel Secure Router 2330/4134
Installation — Hardware Components
NN47263-301 03.01 7 September 2009
Copyright © 2007-2008 Nortel Networks. All Rights Reserved.
DCE X.21 serial cable 111
Direction P2 signal
→
R+
→
R–
→
S+
→
S–
←
T+
←
T–
→
I+
→
I–
←
C+
←
C–
—
GND
Pin 2
4
11
6
13
2
9
5
12
3
10
1
8
Shield