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