What is RJ45 (Registered Jack-45)?

The RJ45 connector is a standard network connector that allows network devices to be connected using 4 pairs (8 wire) UTP cables.

What is RJ45 (Registered Jack-45)?

What Does RJ45 Do, How To Connect And Test It?

RJ45 has eight pins, the use of which is normally used as twisted pair cable ends in computer networks. Generally, the TIA/EIA-568-B standard is used, which defines the order of the pins or cable connections.

Common uses are Ethernet network cables, usually using 8 pins (4 pairs). Other applications include phone terminations in France and Germany, other network services such as ISDN and T1, and even RS-232.

More specifically, the RJ45 connector is used to connect computers to the local network or the Internet and is often referred to as the Ethernet cable in the folk language.

RJ45 models are T-568A and T-568B, and the most common is version B.

Normally this connector is made of plastic or metallic connections. Transparent plastic is used for the connectors that are manually connected to the cables, so you can see if the cable colors and order are correct.

Cable Types

   1. Straight-Through Cable

It is used to directly connect a computer with a network cable, unequal devices in a structure with a hub, switch, router, or modem. In this case, both ends of the cable should have the same sorting order.

As long as the same is used at both ends, there is no difference between the 568B distribution and the 568A distribution. If standard 568B is used at one end and 568A at the other end, it is called a cross cable.

   Straight-Through 568A Standard

T568A Straight-Through Cable Connection Standard

   Straight-Through 568B Standard

T568B Straight-Through Cable Connection Standard

   2. Cross Cable

A crossover cable is a cable that connects all output signals on one connector with Full-duplex input signals on the other connector.

It allows the connection of two electronic devices with Full-duplex communication. It provides reliable transmission over an Ethernet connection.

Cross cable is used to connect two computers, for example, and you do not need to use devices such as Hub and Switch. Another use is to use the Cross cable to connect the Switch and the Switch and the Router and the Router.

Cross cable is used to connect two computers, for example, and you do not need to use devices such as Hub and Switch. Another use is to use the Cross cable to connect from a Switch and to a Switch, and from a Router and to a Router.

To create a cross cable that works with a 10/100baseT cable, the cable must have 568A at one end and 568B at the other end.

Just use the same method to create a cross cable that works with a 10/100/1000baseT cable.

   Cross 568A Standard

T568A Cross Cable Connection Standard

   Cross 568B Standard

T568B Cross Cable Connection Standard

Some connectors have a metal coating that is used as an electromagnetic shield to prevent interference. These connectors are used for network or electromagnetically coated UTP cables so that the cable shield extends to the connector.

Do not confuse the RJ45 connector with the RJ11 connector because these two connectors are different. The uses of the RJ11 connector are different and it has fewer pairs, 2 pairs (4 wires).

Automatic Cross Cable

MDI/MDI-X (Medium Dependent Interface Crossover) is specified as an optional feature in the 1000BASE-T standard and the bi-directional Gigabit interface works directly on cables.

This feature eliminates the need for cross wires and overrides the uplink and manual switch selector feature found in many older hubs and switches. Thus, it significantly reduces installation errors.

Although MDI/MDI-X is generally applied, cross cables may sometimes be required when none of the connected devices include this feature or are enabled.

Prior to the 1000Base-T standard, using a crossover cable to accidentally connect a device to a network was a waste of time in troubleshooting problems, often caused by connection inconsistency. However, when this standard was applied, this was no longer a concern.

Even on older 10/100 devices, many NICs automatically implement an internal cross cable when switches and hubs are needed.

The MDI/MDI-X feature can also be called Auto Uplink, Universal Cable Recognition, and Auto-Sensing.

   How to Connect RJ45 Connector?

A or B version should be used depending on your standard in a computer network by considering the above RJ45 cable connections.

To install an RJ45 connector on twisted-pair ethernet cables, you must first separate both ends of the cable using a cutting tool, and then crimp the threads of the connector with the color sequence.

RJ45 crimping pliers, which are frequently used in computer networks, are as below image;

Network Cable Attachment/Crimping Tool

In addition, you can watch how to use the RJ45 crimping pliers from the video below.

How To Test Its Accuracy After Preparing A Network Cable?

If you are laying a network cable in a large structure, you will probably need meters of cable length. For example, when you want to prepare network cables with different lengths, you may have to do the wiring manually, as the cables you will purchase will usually cost more.

Therefore, after you cut the cable according to your structure, you can save time by preventing the network problems that may occur by testing that you have inserted the RJ45 socket correctly.

You can test your cable by plugging one end of the cable you prepared using the RJ11 and RJ45 network cable tester in the image below to the Master part and the other end to the Remote part.

Network Cable Test

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