Color codes for cross-connections fields have been used for many years. Which color is used to identify campus backbone?

Brown is the standardized color assigned to campus backbone or interbuilding backbone cabling at cross-connect fields, as defined in TIA-606 and legacy AT&T/Bellcore color-coding conventions. This consistent color assignment enables technicians to immediately distinguish campus backbone runs from horizontal, station, or equipment cabling without tracing individual conductors.

Blue identifies horizontal cabling that connects telecommunications outlets to the horizontal cross-connect, not campus backbone.

Green identifies network demarcation connections provided by the local exchange carrier, not campus backbone cabling.

Purple identifies connections to common equipment such as PBX systems or multiplexers, not interbuilding backbone runs.

White identifies first-level backbone cabling between the entrance facility and the main cross-connect, not campus backbone.