Cisco Systems ASR 901 10G manual Identifying a Rollover Cable, Console RJ-45-to-DB-25 Port DTE

Appendix B Cable Specifications

Console Port Signals and Pinouts

Table B-4	Console Port Signaling and Cabling Using a DB-9 Adapter
				RJ-45-to-DB-9
				Terminal Adapter
Console				(Connected to Rollover	Console
Port (DTE)		RJ-45-to-RJ-45 Rollover Cable		Cable)	Device
Signal		RJ-45 Pin	RJ-45 Pin	DB-9 Pin	Signal
DSR/DCD		7	2	4	DTR
CTS		81	1	7	RTS

1. Pin 1 is connected internally to pin 8.

Table B-5lists the pinouts for the asynchronous serial console port, the RJ-45-to-RJ-45 rollover cable, and the RJ-45-to-DB-25 female DTE adapter (labeled TERMINAL).

Table B-5	Console Port Signaling and Cabling Using a DB-25 Adapter
Console				RJ-45-to-DB-25	Console
Port (DTE)		RJ-45-to-RJ-45 Rollover Cable		Terminal Adapter	Device
Signal		RJ-45 Pin	RJ-45 Pin	DB-25 Pin	Signal
RTS		11	8	5	CTS
DTR		2	7	6	DSR/DCD
TxD		3	6	3	RxD
GND/RI		4	5	7	GND
GND		5	4	7	GND/RI
RxD		6	3	2	TxD
DSR/DCD		7	2	20	DTR
CTS		82	1	4	RTS

1. 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 (Figure B-5.) 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).

Cisco ASR 901 10G Series Aggregation Services Router Hardware Installation Guide

OL-28105-02 B-5