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Virtual Path Identifier

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Virtual Path Identifier (VPI) refers to an 8-bit (user-to-network packets) or 12-bit (network-network packets) field within the header of an Asynchronous Transfer Mode packet. The VPI, together with the VCI (Virtual Channel Identifier) is used to identify the next destination of a cell as it passes through a series of ATM switches on its way to its destination. The VPI is useful for reducing the switching table of some virtual circuits which have common paths.

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TekSavvy website is the only place we've seen this info so here's the Link below

http://teksavvy.com/en/support-speedtouchsetup-r.asp

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