What is RJ45 and what are its uses?

What is RJ45 and what are its uses?

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What is RJ45 and what are its uses?

RJ45 is a kind of connector usually employed for Ethernet networking. It looks very similar to a phone jack but is slightly bigger. Considering that Ethernet wires have an RJ45 connector on each end, Ethernet cables are usually also named RJ45 cables. RJ45 is the most recognized and popular connector type in the IT industry.

An RJ45 cable is fundamentally utilized to connect devices over an Ethernet connection. Devices like computers, printers, network storage devices, and cable or DSL modems are able to use an RJ45 connection. Being able to identify an RJ45 cable is necessary when trying to connect devices to a network. RJ45 wires could be wired in two different ways. One version is called T-568B and the other is known as T-568A.

Why RJ45?

The RJ in RJ45 is an abbreviation for registered jack, as it is a standardized networking interface. The number 45 only refers to the number of the interface standard. All RJ45 connectors have eight pins, which means an RJ45 cable includes eight separate wires. If you look closely at the termination of an ethernet wire, you could even see the eight wires, that are each a distinguished color.  Half of them are striped, while the rest are solid colors. 

Modern Ethernet cables use small plastic plugs on each termination that are entered into the RJ45 jacks of Ethernet devices. The word “jack” refers to the port or female termination, while the term “plug” is employed to refer to the cable or male termination of the connection.

RJ45 Parts

Even if an RJ45 Connector is a really simple connector it consists of different parts that include:

  • Crimp to connect the cable to the RJ45 connector.
  • Clip to attach RJ45 to the RJ45 port and release
  • Copper pins that will adhere to the copper lines.

RJ45 Cabling

RJ 45 connector is made up of 8 pins where 8 copper cords are connected. an RJ45 is frequently utilized for CAT5 and CAT6 wires. There are two different standards used for RJ45; as mentioned before, they are named  T-568A and T-568B. They are the same cables but with a different lineup.

The standard T-568B

  • Blue
  • White/Brown
  • Brown
  • White/Orange (sends +)
  • Orange (sends -)
  • White/Green (gets +)
  • White/Blue
  • Green (gets -)

If you would like to receive a quote for any of custom cables or connectors, please do not hesitate to contact us by sending an email to [email protected] or calling in the USA this phone number (682-325-1944)

Jessica Cardona


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