Common Unshielded Twisted Pair Data and Voice Wiring Schemes

8-Wire Jack
(10BaseT Data Connections)

8-Wire Jack
(IBM Token Ring Connections)

8-Wire Jacks
(USOC RJ31X Through RJ37X)

8-Wire Jacks
(USOC RJ41 Through RJ48)
Also TIA 568B
(TIA 568A Swaps Pairs 2 & 3)

6-Wire Jack
(USOC - RJ14W)

6-Wire Jack Modified Jack
(DEC MMJ)