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Networking Fundamentals · Foundational

T568A

A TIA wiring standard for RJ45 terminations with pin order green-white, green, orange-white, blue, blue-white, orange, brown-white, brown.

Definition

T568A places the green pair on pins 1-2 and the orange pair on pins 3-6. It is required in US government installations and some residential standards. Electrical performance is identical to T568B; only the pair positions differ.

Example

A government building is wired with T568A at both jacks and panels.

Exam tip

T568A and T568B differ only by swapping the green and orange pairs.

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