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802.11 FHSS (frequency hopping spread spectrum) wireless LANs have become mostly obsolete; however, you still find them supporting older applications. The problem is that FHSS, which occupies the entire 2.4GHz band, causes significant interference to 802.11b/g/n networks. As a result, be certain to perform a thorough RF site survey before installing the wireless network.

For more tips on deploying wireless LANs, check out my blog.