802.11(b) offers 11 channels, not 3. However, what you probably mean is that there are only 3 non-overlapping channels. You can use (say) channels 1 and 2, but you'll get less than 11mb/s, doing so. Depending on what you're doing, that may or may not be a problem.
In any event, 3 channels are not enough to guarantee that you'll be able to avoid jamming problems. For that, you'd need 4 channels (look up "Four Color Theorem" on your favorite search engine). You *can* provide seamless non-interfering coverage with only 3 channels (or even 2), but only if you can also control the location of the transmitters. With arbitrary placement of transmitters, there's no way around the 4 channel requirement.
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802.11(b) offers 11 channels, not 3. However, what you probably mean is that there are only 3 non-overlapping channels. You can use (say) channels 1 and 2, but you'll get less than 11mb/s, doing so. Depending on what you're doing, that may or may not be a problem.
In any event, 3 channels are not enough to guarantee that you'll be able to avoid jamming problems. For that, you'd need 4 channels (look up "Four Color Theorem" on your favorite search engine). You *can* provide seamless non-interfering coverage with only 3 channels (or even 2), but only if you can also control the location of the transmitters. With arbitrary placement of transmitters, there's no way around the 4 channel requirement.