Cable Colors

The Cabling administration standard(EIA-606) lists the colors and functions of data cabling as:

Horizontal voice cables Blue
Inter-building backbone Brown
Second-level backbone Gray
Network connections and auxiliary circuits Green
Demarcation point, telephone cable from Central Office Orange
First-level backbone Purple
Key-type telephone systems Red
Horizontal data cables, computer & PBX equipment Silver or White
Auxiliary, maintenance & security alarms Yellow