RJ45 Type a or B Ethernet Cable: Which Should You Use?

In the world of networking, the RJ45 connector plays a crucial role in connecting devices and establishing a reliable Ethernet connection. When it comes to wiring an RJ45 connector, there are two commonly used standards known as Type A and Type B. These standards define the order in which the individual wires inside the cable are terminated, allowing for consistent and error-free data transmission. Choosing between Type A and Type B can be perplexing, as both offer their own advantages and are used in different parts of the world. In this article, we will delve into the intricacies of RJ45 Type A and Type B Ethernet cables, discussing their differences, applications, and helping you determine which one suits your specific networking needs. So, buckle up and let's explore the fascinating world of RJ45 connectors and their wiring standards!

How Can I Tell What Type of Ethernet Cable I Have?

When trying to determine the type of Ethernet cable you have, there are several markings that can help you. These markings are usually printed on the side of the cable in black ink. They provide important information about the cables specifications and capabilities.

One key piece of information you can find on the cable is whether it conforms to the TIA/EIA 568A or TIA/EIA 568B wiring standard. These are the two commonly used standards for Ethernet cables. The markings might indicate whether the cable is wired according to the A or B standard, or they could simply state “TIA/EIA 568A” or “TIA/EIA 568B.”

Apart from the wiring standard, you may also find other markings that indicate the cables category or performance level. The most common categories are Cat5e, Cat6, and Cat6a. These categories determine the speed and bandwidth capabilities of the cable.

Furthermore, the cable may also have additional specifications printed, such as it’s length, jacket type, or even the manufacturers logo.

Remember that while these markings can provide valuable information about your Ethernet cable, it’s always a good idea to visually inspect the cable and check for any signs of wear or damage. This can help ensure that your cable is functioning properly and will provide optimal performance for your network.

Common Types of Ethernet Cables: This Topic Would Provide an Overview of the Different Types of Ethernet Cables, Such as Cat5, Cat5e, Cat6, and Cat6a, and Explain Their Differences and Uses.

Ethernet cables are used to connect devices, such as computers, routers, and switches, to local area networks (LANs) for internet access and communication. There are several common types of Ethernet cables, including Cat5, Cat5e, Cat6, and Cat6a.

Cat5 cables are the most basic type, capable of carrying data at speeds up to 100 Mbps. They’re suitable for basic networking needs and are often used in home networks or small businesses.

Cat5e cables are an enhanced version of Cat5 cables, capable of carrying data at speeds up to 1,000 Mbps (1 Gbps). They’ve better insulation and reduced crosstalk, making them more reliable for high-speed networking.

Cat6 cables are designed for more demanding networking environments, capable of carrying data at speeds up to 10 Gbps. They’ve even better insulation and reduced crosstalk compared to Cat5e cables, making them ideal for large networks and high-bandwidth applications.

Cat6a cables are an improved version of Cat6 cables, capable of carrying data at speeds up to 10 Gbps over longer distances. They’ve even stricter specifications for crosstalk and system noise, making them suitable for demanding applications, such as data centers and industrial environments.

When choosing an Ethernet cable, consider the requirements of your network and the devices you’ll be connecting. For basic needs, Cat5e cables are usually sufficient. For more demanding applications, such as multimedia streaming or gaming, Cat6 or Cat6a cables are recommended to ensure optimal performance.

Ethernet cabling follows two main standards, T568A and T568B, with T568B being the preferred choice in most Ethernet installations in the United States. However, T568A is the standard followed by European and Pacific countries. Both standards are equally effective as long as consistency is maintained throughout the cabling process. Now let’s explore the key differences between these two color code standards.

Is Standard Ethernet a or B?

When it comes to Ethernet cables, there are two common standards that determine the wiring scheme for the RJ45 connector: T568A and T568B. These standards determine the color code for each individual wire within the cable.

One might wonder whether it’s important to follow one standard over the other, and the answer is, not necessarily. Both T568A and T568B standards are widely accepted and recognized, and you can use either one as long as youre consistent throughout your entire network installation.

In the United States, T568B is the standard that’s followed by the majority of Ethernet installations.

On the other hand, T568A is the majority standard followed by European and Pacific countries.

The actual conductors within the cable and the way they transmit data are the same for both standards. Therefore, as long as you adhere to either T568A or T568B consistently, you won’t encounter any compatibility issues or performance differences.

Both standards are equally valid and as long as you maintain consistency, you can confidently use either one for your Ethernet cable installations.

How to Terminate an Ethernet Cable Using T568A or T568B

  • Gather all necessary tools and materials, including an Ethernet cable, RJ45 connectors (T568A or T568B), a crimping tool, wire cutters, and a cable tester.
  • Strip the outer jacket of the Ethernet cable, exposing the inner wires.
  • Arrange the wires according to the T568A or T568B wiring standard.
  • Trim any excess wires and ensure they’re even in length.
  • Insert the wires into the RJ45 connector, making sure they reach the end.
  • Double-check the wire order and verify that they’re aligned correctly.
  • Use the crimping tool to secure the RJ45 connector onto the cable, ensuring a strong connection.
  • Repeat the process for the other end of the Ethernet cable.
  • After both ends are terminated, use a cable tester to verify the continuity and functionality of the Ethernet cable.
  • If the cable passes the test, it’s ready to be used for networking purposes.

Determining whether an Ethernet cable follows the 568 A or B standard is crucial for ensuring proper connectivity in networking setups. Recognizing this, the images shown below illustrate the pin-outs for both straight-through and cross-over Cat-5 Ethernet cables for the 568 A and B configurations. By referring to these diagrams and paying attention to the color of the first and second pins, it becomes possible to easily identify whether a cable adheres to the 568B (orange pins) or 568A (green pins) standard.

How Do I Know if My Ethernet Is a or B?

When it comes to Ethernet cables, it’s important to know whether they’re wired according to the 568 A or 568 B standards. The images provided below illustrate the pin-outs for both straight-through and cross-over Cat-5 Ethernet cables that follow these industry standards.

If your network devices are wired as 568 A, then you should use a 568 A Ethernet cable. Similarly, if your devices are wired as 568 B, then a 568 B cable is the appropriate choice.

Mismatching the type of cable with the device pin-outs can result in connection issues and reduced network performance. Therefore, it’s crucial to double-check the pin-outs and cable type to ensure a proper and reliable connection.

This knowledge allows you to select the appropriate cable to optimize network performance and avoid any compatibility problems. So, make sure to familiarize yourself with the differences between the A and B standards and check the cable pin-outs before making any connections.

How to Identify if an Ethernet Cable Is Wired as 568 a or 568 B

  • Check the color coding of the cable.
  • Look for the color order of the wires.
  • Identify if the cable follows the 568 A or 568 B wiring standard.
  • Refer to the color sequence of the wires.
  • Compare it with the 568 A and 568 B standards.
  • Verify the position of the colored wires.
  • Determine if the cable is wired as 568 A or 568 B.
  • Use a cable tester to confirm the wiring scheme.
  • Consult a wiring diagram for further guidance.


Both cable types can effectively transmit data and provide reliable connections. Type A is commonly used in home networks and is compatible with most devices, while Type B is typically found in commercial or industrial settings. It’s crucial to ensure consistency in the wiring scheme throughout your network to avoid any connectivity issues.

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