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Console and Auxiliary Port Signals and Pinouts
To determine whether a UTP cable is a crossover cable or a straight-through cable, hold the two RJ-45
connectors next to each other so you can see the colored wires inside the ends.
Examine the sequence of colored wires to determine the type of cable, as follows:
•
•
Console and Auxiliary Port Signals and Pinouts
The Cisco 7401ASR router does not support Data Carrier Detect (DCD).
console port signals.
Table A-9
Pin
1
2
3
4
6
7
8
Table A-10
Table A-10 Auxiliary Port Signals
Pin
1
2
3
4
5
6
2
7
8
1. RING is not supported on Cisco-supplied adapters. To use this pin, you must create a customized
2. Pin 7 can be used as a DCD input for connection to a modem. The RJ-45-to-DB-25F adapter maps
Cisco 7401ASR Installation and Configuration Guide
A-8
Straight-through—The colored wires are in the same sequence at both ends of the cable.
Crossover—The first (far left) colored wire at one end of the cable is the third colored wire at the
other end of the cable.
Console Port Signals
Signal
Direction
CTS
Out
DSR
Out
RXD
Out
GND
—
—
—
TXD
In
DTR
In
RTS
In
lists the RJ-45 auxiliary port signals.
Signal
Direction
RTS
Out
DTR
Out
TXD
Out
1
RING
In
GND
—
RXD
In
DSR/DCD
In
(RLSD)
CTS
In
cable.
DCD to this pin when used with a straight-through cable.
Description
Clear To Send (tracks RTS)
Data Set Ready (always on)
Receive Data
Signal Ground
Not connected
Transmit Data
Data Terminal Ready
Ready To Send
Description
Ready To Send
Data Terminal Ready
Transmit Data
Ring Indication
Signal Ground
Receive Data
Data Set Ready / Data Carrier Detect
(Receive Line Signal Detect)
Clear To Send (tracks RTS)
Appendix A
Specifications
Table A-9
lists the RJ-45
OL-5419-01 B0
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Troubleshooting
