This page provides pin out information for a crossover cable for the following:
Connecting two machines (only) via Ethernet without the use of a hub or switch
Connecting two CSU/DSU’s back to back for testing Wide Area Network (WAN) configurations.

Cable Pin out:
RJ-45 RJ-45
Connector Connector
----------------------
pin 1 -> pin 3
pin 2 -> pin 6
pin 3 -> pin 1
pin 6 -> pin 2