From The Blog

A Close Look at RJ45 Connectors

Author:danny / time:2018-04-11 / The number of clicks:937

The Registered Jack (RJ45 Connector) is a physical connector that often gets overlooked. And for good reason. We are so used to seeing it everywhere, but there is actually very limited interaction between us and these cables. Save for those moments when we’re setting up our modems or telephone lines, or troubleshooting, we pay very little attention to these connectors. In truth, however, these cables and plugs play a big role in our technologically advanced, highly digital life.


Have you ever wondered how you can easily access information from the Net with just a click of a button? Or how pressing a few keys on your landline telephone can instantaneously connect you to a friend from another part of the world? These things have become so mundane and perfunctory that we don’t even bother to understand the intricate processes that happen behind these activities.


All about communication

Basically, machines are able to communicate to each other via an information network. Your personal computer can access data from the Internet because it sends a signal to your modem, which in turn talks to a central station in cyberspace requesting for certain information. Your telephone communicates to a central database in order to prompt a call to another telephone unit from miles away.


In a nutshell, everything is about communication. And these machines are able to do this primarily because of the RJ45 connector.


Considered the mostcommon kind of twisted-pair connector for Ethernet, the RJ45 connector is a physical network interface used for connecting telecommunications or data tools.


Color-coded connectivity

The RJ45 plug, sometimes referred to as the “female” part of the connector, is an eight-position, eight-contact (8P8C) modular plug. This means that it has eight pins where the wire strands of a cable interface are connected, and eight positions, each about one millimeter apart from the other, where the individual wires are inserted. Looking closely at the end of an RJ45 cable, you will observe that the eight wires are each a different color, four of which are solid and the rest are striped. These eight wires are used in pairs, with each pair to represent a positive or negative polarity


There are two color-coded wiring standards that are used to terminate the RJ45 connector onto the interface—the T568A and T568B. While these two standards have different forms of connectivity, there is no transmission difference between the two cabling schemes. The only difference is the position of the orange and green wire pairings. American standards, however, prefer the T568B wiring pattern, apart from the fact that is also the more common type of the two.


Basic pinouts

For the RJ45, there are two basic cable pinouts. This depends on how the wires are laid out. The first one is the straight-through cable, which is used for connecting to a switch. This is also sometimes called a “patch cable.” For this pinout, either the T568A or T568B is used on both ends of the cable. This pinout is used for connecting computers and routers to modems and hubs.


The second pinout is the cross-over pinout, which means that the connector that one T568A on one end and one T568B on the other end. This pinout is used for connecting one computer to another, especially when a router or switch is not available. This is the more common pinout for the RJ45 connector.



Indeed, the RJ45 connector is one of the most important accessories today in the context of connectivity and networking computers together. Not only can it connect a computer to the Ethernet to access and transfer data, but it can also hook up two or more devices together for equipment networking. We only stand to benefit from more technological advancements concerning the unassuming RJ45 connector.