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Scalable VoIP Mobility by Joseph Epstein

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5.5. The Wi-Fi Radio Types
Let's now look at the types of radios. Radio types, in Wi-Fi, are designated by the amendment letter for the part of the standard that added the description of the specific radio type. The original 802.11 standard, produced in 1999, has only one radio type, but was so limited in bandwidth that it was not broadly used commercially. Subsequent amendments have provided new radio types, starting with 802.11b, which launched wireless LANs into the forefront, and this constant stream of amendments has kept Wi-Fi at the cutting edge of wireless.
It's worthwhile to spend a little bit of time going through the mechanics of how these radios transmit their signals. Voice mobility networks require a keener sense of how wireless operates ...

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