Most Common Rj45 Wiring A Or B

By | September 20, 2022



The RJ45 cable is one of the most ubiquitous and important components in modern networking. As such, it's essential to know the different types of RJ45 wiring, especially if you're planning on making any connections yourself. There are two main types of RJ45 wiring: A and B. Knowing the differences between them can help you ensure that your connections are secure and will work properly.

Let’s talk about the differences between the two wiring types. First, we have the A wiring. This type of wiring uses the T568A standard, which is the most common wiring scheme used for Ethernet cables. This standard utilizes two pairs of wires, one pair for transmitting (pins 1 and 2) and one pair for receiving (pins 3 and 6). With this wiring, pins 4 and 5 are not used. The A wiring is often used for "straight through" connections, meaning the same cable is used for both ends of the connection.

The other type of RJ45 wiring is the B wiring. This wiring uses the T568B standard which also utilizes two pairs of wires. However, the B wiring reverses the roles of pins 1 and 2, as well as pins 3 and 6. This means that the B wiring transmits data on pins 3 and 6, while pins 1 and 2 are used for receiving. Additionally, pins 4 and 5 are still unused. The B wiring is often used for "cross over" connections, meaning the two ends of the connection use two different cables.

So how do you know when to use A or B wiring? Generally, the A wiring is used for straight through connections, while the B wiring is used for cross over connections. If you're not sure which type of wiring you need, you can always consult the manual or check with the manufacturer of your equipment.

No matter which type of RJ45 wiring you choose, it's important to make sure that the wiring is correct. Incorrect wiring could result in poor connectivity or even damage to your equipment. It's also a good idea to use a certified network tester to ensure that the wiring is correct before making any connections.

In conclusion, there are two main types of RJ45 wiring – A and B. Each type of wiring utilizes two pairs of wires, but the roles of these wires are reversed in the B wiring. When making connections, it's important to ensure that the wiring is correct to prevent any damage or poor connectivity.


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