Crossover Cable And Adapter Pinouts; Identifying A Crossover Cable; Adapter Pinouts - Cisco Catalyst 3750 Hardware Installation Manual
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Also See for Catalyst 3750:
- Command reference manual (1154 pages) ,
- Software configuration manual (926 pages) ,
- Hardware installation manual (231 pages)
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Cable and Adapter Specifications
Crossover Cable and Adapter Pinouts
This section describes how to identify a crossover cable and also describes the adapter pinouts.
Identifying a Crossover Cable
To identify a crossover cable, compare the two modular ends of the cable. Hold the cable ends
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 B-13
Pin 1
You can use the mdix auto interface configuration command in the CLI to enable the automatic
Note
medium-dependent interface crossover (auto-MDIX) feature. When the auto-MDIX feature is enabled,
the switch detects the required cable type for copper Ethernet connections and configures the interfaces
accordingly. Therefore, you can use either a crossover or a straight-through cable for connections to a
copper 10/100, 10/100/1000, or 1000BASE-T SFP module port on the switch, regardless of the type of
device on the other end of the connection.
The auto-MDIX feature is enabled by default on switches running Cisco IOS Release 12.2(18)SE or
later. For releases between Cisco IOS Release 12.1(14)EA1 and 12.2(18)SE, the auto-MDIX feature is
disabled by default. For configuration information for this feature, see the switch software configuration
guide or the switch command reference.
Adapter Pinouts
Table B-2
Table B-2
Switch Console
Port (DTE)
Signal
RTS
DTR
TxD
Catalyst 3750 Switch Hardware Installation Guide
B-8
Identifying a Crossover Cable
Pin 1 on one connector and
pin 8 on the other connector
should be the same color.
lists the pinouts for the console port, the RJ-45-to-DB-9 adapter cable, and the console device.
Console Port Signaling Using a DB-9 Adapter
RJ-45-to-DB-9
Terminal Adapter
DB-9 Pin
8
6
2
Appendix B
Pin 8
Console
Device
Signal
CTS
DSR
RxD
Connector and Cable Specifications
Figure
B-13.)
OL-6336-06
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