Color Code (T568 / Fiber)
Visual reference of the T568A / T568B pinout (straight and crossover cable, with the pair that swaps) and the TIA-598-C fiber color code by strand number. To build and verify runs.
RJ45 pinout · straight T568B
| Pin | End A | End B | Pair |
|---|
Fiber color code · TIA-598-C
| Strand | Color | Tracer | Group |
|---|
A buffer/tube groups 12 strands. The same 12-color sequence applies to
buffers and to strands within each buffer.
Notes · T568 and TIA-598-C fiber
A vs B Between T568A and T568B, pairs 2 (orange) and 3
(green) swap — that is pins 1, 2, 3 and 6. Pairs 1 (blue) and 4 (brown)
stay the same.
Straight The same standard on both ends (today almost always
T568B). Connects PC↔switch, switch↔router, etc.
Crossover One end T568A and the other
T568B: it swaps Tx/Rx (pins 1↔3 and 2↔6). Joins
like devices (PC↔PC, switch↔switch) without Auto-MDI-X.
Fiber TIA-598-C orders 12 strands by color:
blue, orange, green, brown, slate, white, red, black, yellow, violet, rose, aqua.
Strands 13–24 repeat those colors with a black tracer.
Local reference in your browser · no sign-up · nothing leaves your browser