Cisco 2500 Series Installation And Configuration Manual page 68

Cabling
TxD 3
GND 4
GND 5
RxD 6
DSR 7
CTS 81
1
You can use the same cabling to connect a console to the auxiliary port.
2
Pin 1 is connected internally to Pin 8.
Auxiliary Port Signals and Pinouts
Use the thin, flat, RJ-45-to-RJ-45 roll-over cable and RJ-45-to-DB-25 male DCE adapter (labeled
"MODEM") to connect the auxiliary port to a modem.
port to a modem. Table C-3
RJ-45-to-RJ-45 roll-over cable, and the RJ-45-to-DB-25 male DCE adapter (labeled "MODEM").
Figure C-4: Connecting the Auxiliary Port to a Modem
Table C-3: Auxiliary Port Signaling and Cabling Using a DB-25 Adapter
Auxiliary Port
(DTE)
Signal
RTS
DTR
TxD
GND
GND
RxD
DSR
CTS
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6
5
4
3
2
1
lists the pinouts for the asynchronous serial auxiliary port, the
RJ-45-to-RJ-45 Roll-Over Cable RJ-45-to-DB-25 Modem Adapter Modem
RJ-45 Pin RJ-45 Pin
1 8
1
2 7
3 6
4 5
5 4
6 3
7 2
81 1
3
7
7
2
20
4
Figure C-4 shows how to connect the auxiliary
DB-25 Pin
4
20
3
7
7
2
8
5
RxD
GND
GND
TxD
DTR
RTS
Signal
RTS
DTR
TxD
GND
GND
RxD
DCD
CTS