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Pin Assignments
D-133163-A2-GB20-10 March 1999
Serial Crossover Cable
Use a serial crossover cable like the one shown in
Figure D-9 (with an adapter like that shown in
Figure D-5) to connect an external modem to the
DSU/CSU’s COM port.
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
Figure D-9. Serial Crossover Cable