According to the ansi/tia/eia-606 color coding guidelines, the color that represents the telephone demarcation point in a commercial building is known to be Green.
A demarc is said to be the short abbreviation that is said to be often used for the term demarcation point.
It is said to be the one that marks the point where communications facilities is said to be owned by one organization interface along with another organization.
Note that In telephone terminology, this is seen to be a kind of an interface between customer-premises equipment and that of the network service provider equipment.
Hence, According to the ansi/tia/eia-606 color coding guidelines, the color that represents the telephone demarcation point in a commercial building is known to be Green.
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