Network cabling standard

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There are two wiring standards for network cabling. T568A and T568B are the two standards for the RJ-45 or 8-position modular connector, permitted under the TIA/EIA-568-A wiring standards document. The only difference between T568A and T568B (also known as Weco, AT & T 258A) is that the orange and green wire pairs (pairs two and three) are interchangeable. How do you decide which model of cable to use:

1. The job specification called a wiring diagram?

2. Theclient user / end have a preference for T568A or T568B?

3. They are equipped with patch panels have already been purchased for the job? If so, you probably will be either T568A or T568B. The sockets must be connected to the same pattern as the panels.

4. You are adding to existing electrical wiring? If so, your new wiring should match the existing wiring.

If none of the above factors, either T568A or T568B may be used. It 'important to ensure that the workstation connectors and the patchThe panels are connected to the model. T568B is commonly used in commercial installations, while T568A is prevalent in a residential installation. For these reasons, we almost always use T568B for facilities not specified.

A bonus is that most network equipment currently on the market have wiring diagrams for either T568A or T568B. Since the difference is only the passage of two pairs of wires, it is quite easy for manufacturers to print both standards on their hardware.For example, a patch panel that is labeled for T568A/T568B usually have colorful patterns above and below the actual punchdown. A will typically be labeled T568A and T568B another. This type of hardware is preferred by installers due to its flexibility.


June 11, 2011. Tags: , , . computer network.

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