Short for Registered Jack-45, a RJ-45 is an 8-pin connection used for Ethernet network adapters. This connector resembles the RJ-11 or 6-pin connector used with telephones in the United States, but they’re completely different. The picture is of a RJ-45 connector separated from the cable.
This connector is most commonly connected to the end of Cat5 cable, which is connected between a computer network card and a network device such as a network router.


RJ-45 is the name for the telephone style plastic connector used on Ethernet cables when connecting IP devices such as IP cameras or computers. RJ-45 plugs are 10 x 5 x 20mm in size and have a lug to stop it being connected incorrectly. RJ-45 connections are either male (plug) or female (socket), with female usually being located on the network devices, and have 8 internal wires (4 pairs). Image of a male RJ-45 Ethernet network plugA female RJ-45 Ethernet network connection