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DSL Advances by Peter J. Silverman, John M. Cioffi, Massimo Sorbara, Thomas Starr

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16.5. The Appeal of Voice-over DSL

There are at least three distinct service opportunities provided by VoDSL: loop extension, PBX extension, and access to packetized voice networks. Although each of these opportunities will require different end-to-end architectures to implement them, they all will use the basic functionality of DSL to support simultaneous access for digitized voice and data. The last two of these opportunities can be supported by DSL access using enhancements to DSL functionality that are already planned for other purposes. However, loop extension requires CPE with capabilities specifically developed to support the service.

By use of the DSL physical access and a broadband network, home offices and small branch offices are given ...

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