The office with demarcation is known as demarcation point. It is a point where communications facilities owned by one organization interface with that of another organization.
Demarcation is the establishment of boundaries or limits separating two areas, groups, or things.
It is a line, boundary, or other conceptual separation between things. Geographically, a demarcation might be the border that separates two countries or the river that divides two regions.
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