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.
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How it works
This visual reference shows the RJ45 pinout for the two wiring schemes of the ANSI/TIA-568 standard: T568A and T568B. You can view a straight-through cable (same scheme on both ends, nowadays almost always T568B) or a crossover cable (T568A on one end and T568B on the other), with the pin-by-pin table for both ends, the pair each conductor belongs to, and highlighted rows where the schemes differ.
The second view covers the optical fiber color code from the TIA-598-C standard: the 12 colors in order (blue, orange, green, brown, slate, white, red, black, yellow, violet, rose and aqua), applying both to buffer tubes and to the strands inside each buffer. A slider lets you locate any strand from 1 to 24: strands 13 through 24 repeat the sequence with a black tracer.
Example: building a T568B straight-through cable
- Select Straight · T568B and order the conductors on both ends: white-orange, orange, white-green, blue, white-blue, green, white-brown, brown (pins 1 through 8).
- Check that both ends are identical: in a straight-through cable, pin 1 on one end connects to pin 1 on the other.
- If you needed a crossover, the tool shows that only the orange and green pairs change: pins 1, 2, 3 and 6 are swapped (1↔3 and 2↔6), which is the Tx/Rx cross.