Cable and Wire Color Code

Click for enlarged view.

This photo shows one side of a Bell System job aid that displays the pair numbers corresponding to the 25 tip & ring color code combinations. The white tab can be rotated around the perimeter to display the right-most 2 digits of each pair number for a given range of pairs. The back side provides the same information for the succeeding range of 300 pairs.

For more on the color code topic, see this Wikipedia article.

This may take some of you back to the days when large and small copper cables were dominant in the outside plant of telcos.

John WA5MLF