Color-coding of termination fields can simplify infrastructure administration and maintenance by making the structure of the cabling more intuitive.

TERMINATION TYPE        COLOR        TYPICAL APPLICATION

Demarcation Point

orange

central office connection

Network Connection

green

user side of central office connection

Common Equipment

purple

connections to PBX, mainframe computer, LAN, multiplexer

Key System

red

connections to key telephone systems

First Level Backbone

white

terminations of intrabuilding backbone cable connecting MC to ICs

Second Level Backbone

gray

termination of intrabuilding backbone cable connecting ICs to HCs

Interbuilding Backbone

brown

termination of backbone cable between buildings

Horizontal

blue

terminations of horizontal cable in TSs

Other

yellow

alarms, security, or energy management