Cisco Systems 3110G, 3110X, 3012 Two Twisted-Pair Cable Pinouts, Identifying a Crossover Cable

Appendix B Connector and Cable Specifications

Cable and Adapter Specifications

Two Twisted-Pair Cable Pinouts

Figure B-6and Figure B-7show the schematics of two twisted-pair cables.

Figure B-6

Switch

3TD+

6 TD–

1RD+

2 RD–

Figure B-7

Switch

3TD+ 6 TD–

1RD+ 2 RD–

Two Twisted-Pair Straight-Through Cable Schematic

Router or PC

3 RD+

6 RD–

1 TD+	H5578
2 TD–

Two Twisted-Pair Crossover Cable Schematic

Switch

3TD+

6TD–

1 RD+	H5579
2 RD–

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-8.)

Figure B-8 Identifying a Crossover Cable

Pin 1 on one connector and pin 8 on the other connector should be the same color.

Pin 1 Pin 8

H10632

Catalyst Switch Module 3110G, 3110X, and 3012 for IBM BladeCenter Hardware Installation Guide

OL-12192-01 B-5