Cable pairs are not designated by the traditional "bbro. . . . ." resistor color code.
The "color" wire of a pair in a cable is Blue, Orange, Green, Brown, Slate (slate is grey) for the first 5 pairs. The other side of each pair, or tracer wire, is selected from the color range of tracers or wrappers which is White, Red, Black, Yellow. Violet. Thus the first 5 pairs are Blue-White, Orange-White, Green-White, Brown-White, Slate-White.
The next 5 pairs will have a Red tracer as Blue-Red, Orange-Red, Green-Red, Brown-Red, Slate-Red. This scheme continues through the first 25 pairs with the 25th pair being Slate-Violet.
Each group of 25 pairs will be loosely wrapped with a group tracer color selected from the tracer colors, White, Red, Black, Yellow, Violet. The next group of 25 would be wrapped with a Red group tracer and so on until there are 5 groups of 25 pairs (125 pairs).
The 5 groups of 125 pairs would be wrapped with a White tracer, then the next group with a Red tracer, next with a Black tracer and so on until 625 pairs is counted. If more than 625 pairs is in a cable, the first 625 pairs would be bound with a White wrapper and the scheme would continue.
Bob Swinney