Krone cable is the common name given to KSM Series multi-pair cable used within the Krone System. It consists of a series of pairs of cables, all shielded with an overall foil shield within the cable sheath. Krone cable can be found with a variety of different numbers of pairs, ranging from 5 pairs to 50 pairs.
Krone cable uses a distinctive colour-coding system to identify pairs of cables. Each pair of cables comprises a solid-coloured cable ("primary"), and a banded-coloured cable ("secondary"). The solid-coloured cable can take any of five colours (blue, orange, green, brown, grey), and the banded-coloured cable has the pair's corresponding solid colour and a banded colour common to all the pairs within a group of five (white, red, black, yellow, violet). Thus, pairs are organised into groups of five by their banded colour.
The pairs within a Krone cable are twisted together, so that the primaries can be identified with their corresponding secondaries. It is very important to keep the pairs twisted together unless it is absolutely necessary to separate them. If pairs are untwisted and separated, it becomes very easy to mix two pairs up (for example, connecting the blue from pair 1 with the blue-red from pair 2, and the blue from pair 2 with the blue-white from pair 1).
The first 50 pairs of Krone cable are coloured in the following sequence:
|#||Solid-Coloured ("A-Core")||Banded-Coloured ("B-Core")|
http://www.canford.co.uk/Techzone/CableColourCodes.pdf - See "KSM, BSM Series"