Identifying A Rollover Cable - Cisco 901 Installation Manual

Appendix B Cable Specifications
Table B-5
Console
Port (DTE)
Signal
RTS
DTR
TxD
GND/RI
GND
RxD
DSR/DCD
CTS
1. You can use the same cabling to connect a console to the auxiliary port.
2. Pin 1 is connected internally to pin 8.

Identifying a Rollover Cable

To identify a rollover cable, compare the modular plugs at the two ends of the cable. When you hold the
plugs 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 you purchased your cable from Cisco Systems, pin 1 is white on one connector, and pin 8 is white on
the other (a rollover cable connects pins 1 and 8, 2 and 7, 3 and 6, and 4 and 5).
Figure B-5
OL-23778-01
Console Port Signaling and Cabling Using a DB-25 Adapter
1
RJ-45-to-RJ-45 Rollover Cable
RJ-45 Pin RJ-45 Pin
2
1 8
2 7
3 6
4 5
5 4
6 3
7 2
2
8 1
Identifying a Rollover Cable
Pin 1
Cisco ASR 901 Series Aggregation Services Router Hardware Installation Guide
RJ-45-to-DB-25
Terminal Adapter
DB-25 Pin
5
6
3
7
7
2
20
4
Pin 1 and pin 8
should be the
same color
Pin 8
Console Port Signals and Pinouts
Console
Device
Signal
CTS
DSR/DCD
RxD
GND
GND/RI
TxD
DTR
RTS
(Figure B-5.)
B-5