RJ Connectors are a family of push-and-click connectors for twisted-pair wiring in telephone and network wiring. RJ stands for Registered Jack. RJ types define both a jack or receptacle female and a plug male type of connector. While the RJ designation technically only pertains to the wiring of the jack i.
This has created plenty of confusion. For example, while the RJ11 is technically a single wire pair connection due to its 2-contact status , the RJ14 and RJ25 use the same six-position modular connector, and the three are therefore physically identical despite the different number of contacts. This is along the same lines of what now has us referring to 8P8C twisted-pair Ethernet connectors as RJ The early user of the 8P8C wiring was a keyed RJ45 used to connect dual trunk lines in the telephony world.
When the telephony world started to run data over these connectors, the RJ45 name stuck. RJ is a telephony specification and although the connectors are almost identical to 8P8C, they have different signal conduction characteristics. By: Justin Stoltzfus Contributor, Reviewer. By: Satish Balakrishnan. Dictionary Dictionary Term of the Day. Natural Language Processing.
Techopedia Terms. Since each connector has eight pins, an RJ45 Ethernet cable will have eight wires of varying colours. RJ45 cables can be wired according to two different schemes, T A or B, depending upon the devices to be connected within the network.
Crossover patch cables have different wiring schemes on each end to support computer-to-computer connections. High-speed modem and other computer network applications are supported by RJ connectors.
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