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Console and Auxiliary Port Signals and Pinouts
•
RJ-45-to-DB-25 female DTE adapter (labeled "TERMINAL").
•
RJ-45-to-DB-25 male DCE adapter (labeled "MODEM").
For console connections, proceed to the section "Console Port Signals and Pinouts" later in
this appendix; for modem connections, proceed to the section "Auxiliary Port Signals and
Pinouts" later in this appendix.
Identifying a Roll-Over Cable
You can identify a roll-over cable by comparing the two modular 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. (See Figure C-1.) If your cable came from Cisco Systems, pin 1 will be white
on one connector, and pin 8 will be white on the other (a roll-over cable reverses pins 1 and
8, 2 and 7, 3 and 6, and 4 and 5).
Figure C-1
C-2 Router Installation and Configuration Guide
Identifying a Roll-Over Cable
Pin 1 and pin 8
should be the
same color
Pin 1
Pin 8
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Troubleshooting
