25-Pair Color Code Chart
The universal North American telecom pair sequence: five tip colors by five ring colors, giving 25 uniquely-colored pairs. It is an industry convention (Bell System heritage) rather than a code requirement — but every backbone cable, 66 block, and 110 field you open follows it, and the 4-pair cable in every ethernet jack is simply its first four ring colors on a white tip.
The 25-pair sequence
| Pair | Tip wire | Ring wire |
|---|---|---|
| 1 | White/Blue | Blue/White |
| 2 | White/Orange | Orange/White |
| 3 | White/Green | Green/White |
| 4 | White/Brown | Brown/White |
| 5 | White/Slate | Slate/White |
| 6 | Red/Blue | Blue/Red |
| 7 | Red/Orange | Orange/Red |
| 8 | Red/Green | Green/Red |
| 9 | Red/Brown | Brown/Red |
| 10 | Red/Slate | Slate/Red |
| 11 | Black/Blue | Blue/Black |
| 12 | Black/Orange | Orange/Black |
| 13 | Black/Green | Green/Black |
| 14 | Black/Brown | Brown/Black |
| 15 | Black/Slate | Slate/Black |
| 16 | Yellow/Blue | Blue/Yellow |
| 17 | Yellow/Orange | Orange/Yellow |
| 18 | Yellow/Green | Green/Yellow |
| 19 | Yellow/Brown | Brown/Yellow |
| 20 | Yellow/Slate | Slate/Yellow |
| 21 | Violet/Blue | Blue/Violet |
| 22 | Violet/Orange | Orange/Violet |
| 23 | Violet/Green | Green/Violet |
| 24 | Violet/Brown | Brown/Violet |
| 25 | Violet/Slate | Slate/Violet |
Where you still meet it
Every multi-pair voice backbone, riser tie cable, and cross-connect field is punched in this order, and the pair number IS the position — pair 13 (black/green) lands on rows 25–26 of a 66 block, no counting labels required. The 4-pair data cable behind every RJ45 jack borrows the first four ring colors (blue, orange, green, brown) against a white tip, which is why the T568A/B pinouts read like the first four pairs of this chart, reshuffled. For how the pairs land on hardware, see the 66 & 110 block reference.
Common questions
What is the 25-pair color code order?
Five tip (major) colors — white, red, black, yellow, violet — each combined with five ring (minor) colors — blue, orange, green, brown, slate. Pair 1 is white/blue and pair 25 is violet/slate. The tip wire is the tip color banded with the ring color; the ring wire is the reverse. The mnemonic pairs "Why Run Backwards, You Varmint" (tip) with "Bell Operators Give Better Service" (ring).
Which wire is tip and which is ring?
Tip is the first wire of the pair — historically the tip of the operator's plug, electrically the ground side — and carries the majority color (white/blue means a white wire with a blue band). Ring is the second wire, the battery (−48 V) side, with the colors reversed (blue/white). On a 66 block the tip wire lands on the upper row, its ring mate directly beneath.
How does the color code work past 25 pairs?
Larger cables bundle the pairs into 25-pair binder groups, each wrapped with a colored binder ribbon that follows the same sequence — the white/blue binder holds pairs 1–25, white/orange holds 26–50, and so on. 24 usable binder colors give a 600-pair "super binder" (the violet/slate binder goes unused), and cables beyond that repeat the pattern in groups of 600.
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