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demarcation point
Last modified: Tuesday, October 13, 2009 

Also called point of demarcation, demarc extension, or demarc, it is the physical point at which the public network of a telecommunications company (i.e., a phone or cable company) ends and the private network of a customer begins — this is usually where the cable physically enters a building.

For example, if your business subscribes to receive Internet through a local phone or cable company, the provider installs a demarcation point at your business. The demarc is usually a grey box mounted on the outside of the building. On the outside of the building the provider's wires run in to the demarc (overhead or underground). The wires are switched at the Demarc and are then run into the physical building. For residential services, the demarc is often installed inside the residence in the homeowner's cellar or basement.

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DataStar USA - Demarc Extension
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ISP-Planet
Founded in April, 1999 by Ted Stevenson as part of internet.com's xSP Channel, ISP-Planet was designed from the start to address the concerns of Internet Service Providers. ISP-Planet covers the main areas of interest for Internet Service Providers such as equipment, perspectives, Fixed wireless, industry news & trends, market research, news, and more.

Webopedia's "Did You Know...?" Section
Use this Webopedia knowledge section for an in-depth overview of specific technologies and occurrences in the areas of Computer Science, The Internet, and Computer Hardware and Software.

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