Wire Center Boundaries
Wire Centers are the basic unit of geography for the telecom industry. They describe the organization of the local telephone exchange system. Each Wire Center serves a unique set of telephone numbers within a fixed geographic area. A telephone number consist of three parts: Area Code (3 digits), Prefix (3 digits) and the Line Number (4 digits). Typically, each Prefix is assigned to one specific Wire Center. This means that numbers are assigned to wire centers in blocks of 10,000. A Wire Center Boundary is a polygon of the area that contains the numbers in a Wire Center.
The Wire Center Boundaries data is available in the following formats:
Country or State level ArcView shape files or MapInfo format files.
The Wire Center Boundaries file represents the Wire Center Boundaries layer.
Coverage, Scale and Coordinates
The GeoTel database has the following coverage, scale and coordinates:
- Coverage includes the U.S. 50 states; D.C.
- Scale 1:24,000
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