Cisco Systems CATALYST 2940 Manual De Usuario
B-9
Catalyst 2940 Switch Hardware Installation Guide
OL-6157-01
Appendix B Connectors and Cables
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
cable ends. Hold the cable ends side-by-side, with the tab at the back, right plug, as shown in
.
Figure B-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 the right plug.
as the wire connected to the pin on the outside of the right plug.
Table B-3
Console Port Signaling and Cabling Using a DB-25 Adapter
Console
Port (DTE)
Port (DTE)
RJ-45-to-DB-9
Adapter Cable
Adapter Cable
RJ-45-to-DB-25
Terminal Adapter
Terminal Adapter
Console
Device
Device
Signal
RJ-45 Pin
DB-9 Pin
DB-25 Pin
Signal
RTS
1
8
5
CTS
Not
connected
connected
2
6
6
DSR
TxD
3
2
3
RxD
GND
4
5
7
GND
GND
5
5
7
GND
RxD
6
3
2
TxD
Not
connected
connected
7
4
20
DTR
CTS
8
7
4
RTS
1
Pin 1
2
Pin 9
89889
2
1