How to Terminate Ethernet Cables | RJ-45 Wiring Scheme The wall jack may be wired in a different sequence because the wires may be crossed inside the jack. The jack should have a wiring diagram or designated pin numbers/colors to match up to the color code below. When wiring a jack or an RJ-45 plug, remember to keep the “twist” as close as possible to the (jack or plug) receptacle. This will Related searches for phone jack wiring diagram how to wire a telephone jackresidential telephone wiring diagram2 line phone wiring diagramdsl phone jack wiring diagramhome telephone wiring diagramhow to wire a phone linetelephone cable wirehow to install a phone jack