Cisco Catalyst 4500 Series

Console
Port
RJ-45-to-RJ-45
Rollover Cable
RJ-45-to-DB-25
Terminal
Adapter
Console
Device
Signal
RJ-45
Pin
RJ-45
Pin
DB-25 Pin Signal
RTS 1¹ 8 5 CTS
DTR 2 7 6 DSR
TxD 3 6 3 RxD
GND 4 5 7 GND
GND 5 4 7 GND
RxD 6 3 2 TxD
DSR 7 2 20 DTR
CTS 8¹ 1 4 RTS
¹Pin 1 is connected internally to Pin 8.
Modem Adapter
Use the RJ-45-to-RJ-45 rollover cable and the RJ-45-to-DB-25 male DCE adapter (labeled
"Modem") to connect the console port to a modem. Table I-3 lists the pinouts for the asynchronous
serial auxiliary port, the RJ-45-to-RJ-45 rollover cable, and the RJ-45-to-DB-25 male DCE
adapter.
Table I-3: Port Mode 1: Console Port Signaling and Pinouts (Modem Adapter)
Console
Port
RJ-45-to-RJ-45
Rollover Cable
RJ-45-to-DB-25
Modem Adapter
Modem
Signal
RJ-45
Pin
RJ-45
Pin
DB-25 Pin Signal
RTS 1¹ 8 4 RTS
DTR 2 7 20 DTR
TxD 3 6 3 TxD
GND 4 5 7 GND
GND 5 4 7 GND
RxD 6 3 2 RxD
DSR 7 2 8 DCD
CTS 8¹ 1 5 CTS
¹Pin 1 is connected internally to Pin 8.
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Cisco - Connecting a Terminal to the Console Port on Catalyst Switches
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