[PDF] Color Codes for RJ-45 Ethernet Plug - PSSurvival The jack should either come with a wiring diagram or at least designate pin numbers that you can match up to the color code below. There are two wiring standards for these cables, called T-568A and T-568B. They differ only in pin assignments, not in uses of the various colors. How to Install an Ethernet Jack for a Home Network Jul 24, 2017The following instructions illustrate how to wire the Ethernet jack per the T568B standard. The means matching the twisted pair colors to the “B” color code band on the Ethernet jack. Notice the B color band (upside down) on the Leviton QuickPort Jack in the image below.