The Cabling administration standard (EIA-606) lists the colors and functions of data cabling as:
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Horizontal voice cables
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Blue
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Inter-building backbone
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Brown
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Second-level backbone
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Gray
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Network connections and auxiliary circuits
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Green
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Demarcation point, telephone cable from Central Office
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Orange
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First-level backbone
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Purple
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Key-type telephone systems
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Red
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Horizontal data cables, computer & PBX equipment
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Silver or White
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Auxiliary, maintenance & security alarms
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Yellow
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