Non-802.11 Interference
Recall that the 2.4-GHz band is an ISM band. This means that your 802.11 wireless LAN devices might share the same frequency space as non-802.11 devices. That might not sound like a bad situation because the devices could simply be configured to use different, non-overlapping channels.
In practice, such an elegant solution might not be possible. Many non-802.11 devices do not sit on any one channel; they use frequency-hopping spread spectrum (FHSS) to hop around on a variety of channels at any given time. Even worse, some devices do not adhere to any channel scheme at all. Figure 3-4 shows transmitters A, B, and C using channels 1, 6, and 11—a perfect world—until someone decides to warm up her lunch. A nearby microwave ...
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