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Everything You Need to Know About RJ45 Ethernet Connectors



 RJ45 are connectors usually found at the end of Ethernet cables and connect devices over an Ethernet connection. Some devices that are capable of using this type of connection include computers, laptops, network storage devices, printers, DSL modems, etc. the abbreviation is registered jack because it is a registered network interface. The number 45 indicates the number of the interface as a standard.

An RJ45 consists of eight pins which is an indication of eight separate wirings. If you pay attention to the endpoints of an Ethernet cable you can see all these eight wires of a different colour. Some of these colours are stripped while the rest are solid colours.


The Ethernet devices consist of RJ45 jacks and the Ethernet cables are entered into them by using small plastic plugs at the ends. The word jack indicates the female termination and the plug indicates the male termination of the connection. 


 It looks greatly similar to a phone jack but is larger. As mentioned, Ethernet cables have RJ45 connectors at the end therefore Ethernet Cables are also known as RJ45 cables. These are the most popular and commonly used connectors in the information technology industry. 


When you want to connect devices to a network it is important that you identify an RJ45 connector and how it works. Commonly there are two methods of wiring these wires. One method is known as T-568B and the other one is T-568A.

Types of RJ45 cables 

RJ45 cables Screwfix are usually of two types known as standard patch cables and crossover cables. 


Standard Patch Cables: These cables are used for indirect connections like to connect a computer to a router or to connect a cable modem to a router. 


Crossover Cables: these ethernet cables are used for direct connection like to connect a computer to a computer without the need of a router. 


Both of these cables look very similar. However, the major difference between them is the termination or the end parts of the wirings in the plug. If you end up using a standard patch cable for a connection where a crossover cable is needed, no damage will be caused to the devices but no connection will be formed in this case. 

Parts Of RJ45 Connectors

Despite its simplicity, the RJ45 connector is made of different parts that are stated here:

  • For connecting the cable to the RJ45 connector it consists of a crimp.

  • For easy attachment and release of RJ45 to the RH45 port, it uses a Clip.

  • At last, it consists of copper pins for sticking to the copper lines.

Uses of RJ45 Connectors

RJ45 technology is now frequently used in both households and businesses to connect devices and to the internet as well.


Additional network-capable gadgets can also be connected by the use of RJ45 cables. For instance, a workplace may also connect a laser printer to its network by using RJ45 cables Argos, therefore allowing anybody linked to the network to print to the shared printer. Rather than keeping a high-priced pc server, an organization might also opt to join a NAS device (community-attached storage) to a network using an RJ45, for this reason permitting different customers related to the community network to get admission to documents stored on the NAS device.

Competing Technology

The RJ45 cables are the most popular for networking purposes but still have some competition. Fibre optics is the newest technology that offers greater speeds as compared to RJ45 cable 20m but is more expensive as well. This is a wireless technology that allows for devices to be connected. However,

This wireless technology cannot directly compete with RJ45 because of its two faults. First of all, the data transmission is not as fast as RJ45. Secondly, the data transmitted through the network can be easily exposed to others over the airwaves with a person that has a device capable of listening to the data being transmitted wirelessly. The data transmitted through connections that use RJ45 cannot be extracted that easily because the person would need a physical connection to the network to access it.

RJ45 Interface Color Coding

The two common schemes that are used to terminate the twisted-pair cable onto the connector interface are known as T568A vs T568B. These two schemes explain how the RJ45 pinouts place the individual wires connecting the RJ45 connector to a cable. These wirings have their colour coding to help with electricity compatibility. The more commonly used wiring scheme is the T-568B.


Concerning the two requirements, there are specific connectivity needs. If both ends of the patch cords are wired in one manner or under one standard, it's miles a straight-through connection. If no longer, it's miles a crossover connection. Some networking programs need a crossover Ethernet cable, which has a T-568A connector on one end and a T-568B connector on the alternative. This type of cable is usually used for direct laptop-to-laptop connections when there's no router, hub, or transfer to be had.


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