RJ45 T568A and T568B Pinout Reference
Look up eight-pin T568A and T568B color and pair assignments, confirm connector viewing direction, and distinguish pin order from cable performance.
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Pin and pair table
T568A and T568B are two assignments for an eight-position modular connection commonly called RJ45. They exchange the green and orange pair positions; the blue and brown pairs keep their pin assignments.
| Pin | T568A | T568B | Pair number: A / B |
|---|---|---|---|
| 1 | White/green | White/orange | 3 / 2 |
| 2 | Green | Orange | 3 / 2 |
| 3 | White/orange | White/green | 2 / 3 |
| 4 | Blue | Blue | 1 / 1 |
| 5 | White/blue | White/blue | 1 / 1 |
| 6 | Orange | Green | 2 / 3 |
| 7 | White/brown | White/brown | 4 / 4 |
| 8 | Brown | Brown | 4 / 4 |
“White/green” means the white conductor identified with green in the pair. Read the actual cable construction and the connector instructions when stripe appearance is unclear.
Confirm the viewing direction
For a jack or patch panel, use its printed A/B termination labels and installation instructions. Do not copy the straight pin table onto an unrelated physical IDC layout.
Preserve pairs and verify the link
- Use the specified scheme consistently for the project. A straight-through assembly uses the same pin assignment at both ends; project and product requirements still govern.
- Keep pair identities intact. Pins 3 and 6 are a pair, while pins 4 and 5 form another pair; a sequence that looks orderly can still create split pairs.
- Follow the connector instructions for cable category, conductor gauge and construction, jacket preparation, pair handling, and strain relief.
- Use the required link testing to check wiremap and performance. A pinout chart does not certify cable category, length, or PoE suitability.
The linked Leviton sheet illustrates both assignment schemes for its documented product. The manufacturer’s mounting and termination details apply to that product, not every modular connector.
Use the existing PoE budget worksheet for its separate power-budget task and the record template to retain a test reference and result.