B-9
Catalyst 2940 Switch Hardware Installation Guide
OL-6157-01
AppendixB Connectors and Cabl es
Cable and Adapter Specifications
Identifying a Rollover Cable
You can identify a rollover cable, also known as a “crossover” cable, by comparing the two modular
cable ends. Hold the cable ends side-by-side, with the tab at the back, right plug, as shown in
Figure B-12.
FigureB-12 Identifying a Rollover Cable
On a rollover cable, 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 t he right plug.
TableB-3 Console Port Signaling and Cabling Using a DB-25 Adapter
Console
Port (DTE)
RJ-45-to-DB-9
Adapter Cable
RJ-45-to-DB-25
Terminal Adapter
Console
Device
Signal RJ-45 Pin DB-9 Pin DB-25 Pin Signal
RTS 1 8 5 CTS
Not
connected
266 DSR
TxD 3 2 3 RxD
GND 4 5 7 GND
GND 5 5 7 GND
RxD 6 3 2 TxD
Not
connected
7420 DTR
CTS 8 7 4 RTS
1Pin 1
2Pin 9
89889
2
1