Nortel 4134 安装指导
82
Appendix Serial cable descriptions
Figure 25
DTE X.21 serial cable
DTE X.21 serial cable
Table 40
DTE X.21 serial cable description
DTE X.21 serial cable description
P1 pin
P1 signal
Note
Direction
P2 signal
P2 pin
1
14
14
TXD+
TXD–
TXD–
Twisted
pair
pair
→
→
T+
T–
T–
2
9
9
4
17
17
RXC+
RXC–
RXC–
Twisted
pair
pair
←
←
S+
S–
S–
6
13
13
5
18
18
RXD+
RXD–
RXD–
Twisted
pair
pair
←
←
R+
R–
R–
4
11
11
8
9
9
RTS+
RTS–
RTS–
Twisted
pair
pair
→
→
C+
C–
C–
3
10
10
11
10
10
CTS+
CTS–
CTS–
Twisted
pair
pair
←
←
I+
I–
I–
5
12
12
26
Shield
Shield
GND
—
GND
1
8
Shield
8
Shield
2
TXCE+
No connect
3
TXC+
No connect
6
DCD+
No connect
7
DTR+
No connect
12
DSR+
No connect
13
LL
No connect
15
TXCE–
No connect
16
TXC–
No connect
19
DCD–
No connect
20
DTR–
No connect
21
MODE2
GND
Nortel Secure Router 4134
Installation — Hardware Components
NN47263-301
01.02
Standard
10.0
7 August 2007
Copyright © 2007, Nortel Networks
.