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B-5
Catalyst 3550 Multilayer Switch Hardware Installation Guide
OL-6155-01
Appendix B Connector and Cable Specifications
Cable and Adapter Specifications
Rollover Cable and Adapter Pinouts
This section describes how to identify a rollover cable (used to connect to the console port) and also
describes the adapter pinouts.
Identifying a Rollover Cable
To identify a rollover cable, compare the two modular ends of the cable. Hold the cable ends
side-by-side, with the tab at the back. The wire connected to the pin on the outside of the left plug should
be the same color as the wire connected to the pin on the outside of the right plug. (See Figure B-10.)
Figure B-10 Identifying a Rollover Cable
Adapter Pinouts
Table B-2 lists the pinouts for the console port, the RJ-45-to-DB-9 adapter cable, and the console device.
Pin 1
H10632
Pin 8
Pin 1 on one connector and
pin 8 on the other connector
should be the same color.
Table B-2 Console Port Signaling Using a DB-9 Adapter
Switch Console
Port (DTE)
RJ-45-to-DB-9
Terminal Adapter
Console
Device
Signal DB-9 Pin Signal
RTS 8 CTS
DTR 6 DSR
TxD 2 RxD
GND 5 GND
GND 5 GND
RxD 3 TxD
DSR 4 DTR
CTS 7 RTS