(
Registered 
Jack-
45)  A common data networking interface that employs a cable of twisted wire pairs and an 8-pin modular jack.  RJ-45 is used for Ethernet and Type 3 Token Ring networks.  See 
cable categories and 
RJ-48.
RJ-45 Connectors
Eight-wire RJ-45 connectors are used with Ethernet and Type 3 Token Ring networks.
Variations of RJ-45
These are the variations of RJ-45 pins and wire colors.