Console
Device
RJ-45-to-DB-25
Modem Adapter
Adapter
RJ-45-to-RJ-45 Rollover Cable
Console Port
GND
7
4
5
GND
TxD
2
3
6
RxD
DTR
8
2
7
DSR
RTS
5
1
8
20
CTS
19 Pin 1 is connected internally to Pin 8.
20 Pin 1 is connected internally to Pin 8.
Identifying a Rollover Cable
You can identify a rollover cable by comparing the two ends of the cable. Holding the cables 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. If your cable was purchased from Cisco, pin
1 will be white on one connector, and pin 8 will be white on the other. (A rollover cable reverses pins 1 and
8, 2 and 7, 3 and 6, and 4 and 5.)
Figure 41: Identifying a Rollover Cable
Cable Pinouts
The following tables and figures describe the pinouts and schematics for cables that the switch supports.
Table 33: 10 BASE-T and 100 BASE-T Crossover Cable Pinout (MDI-X)
Side 2 Pin (Signal)
Side 1 Pin (Signal)
3 (TD+)
1 (RD+)
6 (TD
–
)
2 (RD
–
)
Cisco Catalyst 6807-XL Switch Hardware Installation Guide
92
OL-30656-01
Transceivers, Module Connectors, and Cable Specifications
Identifying a Rollover Cable
