A-15
User Guide for the Catalyst Express 520 Switches
OL-12761-02
Appendix A      Reference
Cable and Adapter Specifications
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 a different color from the wire 
connected to the pin on the inside of the right plug. (See Figure A-12.) 
Figure A-12 Identifying a Crossover Cable
Pin 1
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Pin 1
Pin 1 on one connector and 
pin 1 on the other connector
should be different colors.