Date First Published: 27th April 2022
Topic: Computer Networking
Subtopic: Network Hardware
Article Type: Computer Terms & Definitions
Difficulty: MediumDifficulty Level: 5/10
Learn more about what RJ45 is in this article.
Short for registered jack 45, RJ45, sometimes spelt RJ-45, is the connector used in Ethernet cables that can be seen at the end of the physical cable. The jack in Ethernet cables is slightly wider than telephone jacks and the '45' in RJ45 refers to the interface standard.
RJ45 connectors are often confused with the 8P8C standard, since they both look very similar. However, 8P8C has certain properties in regard to signal loss. This is because the cabling is always made up of twisted pairs, which is a noise-cancelling technology.
RJ45 connectors usually make a connection between the network card of a computer and the network device, such as the router or switch.
RJ45 connectors consist of 8 pins and 8 separate wires of different colours. 4 of the 8 wires are solid colours and the others are striped. The individual wires are spaced 1 mm apart. There are also two ways that RJ45 connectors can be wired, known as T-568A and T-568B.
Even though most devices are compatible with the T-568A wiring scheme, the T-56EB wiring scheme is much more common. Direct connections with no routers, hubs, or switches use crossover Ethernet cables, where there is a T-568A connector on one end and a T-568B connector on the other end.
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