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Scalable VoIP Mobility by Joseph Epstein

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5.3. RF Primer
Understanding how Wi-Fi fits into voice mobility requires knowing how the radios work. It is tempting to want to regard Wi-Fi, because of its convenience, in the same way as wired: connect, and it just works, barring some rare cabling problem. However, Wi-Fi has a large number of different elements that come together to allow the wireless to work and provide high throughput, and the consequences from how some of those elements work need to be understood In this way, one of the major distinctions between voice mobility and simple data networking is that those concerned with voice mobility must become familiar with the finer details.
5.3.1. Channels
One Wi-Fi radio does not occupy the entire unlicensed spectrum, unlike frequency-hopping ...

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