E. Pin Assignments
3160-A2-GB24-10 March 2001 E-15
Serial Crossover Cable

Use a serial crossover cable like the one shown in Figure E-10, Serial Crossover

Cable (with an adapter like that shown in Figure E-10, Serial Crossover Cable) to

connect an external modem to the DSU/CSUs COM port.

Figure E-10. Serial Crossover Cable

Pin 1
Pin 14
Pin 13
Pin 25
Pin 1
Pin 14
Pin 13
Pin 25
P2
Plug
Chassis Ground
TXD
RXD
RTS
CTS
DSR
Signal Ground
CD (RLSD)
DTR
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Pin
497-15180a
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
P1
Chassis Ground
TXD
RXD
RTS
CTS
DSR
Signal Ground
CD (RLSD)
DTR
Pin P2
P1
Plug