requires 16.25 (11b) or 22 MHz (11g/n) of channel separation (as shown below). Any remaining gap is used as a guard band to allow sufficient attenuation along the edge channels. This guardband is mainly used to accommodate older routers with modem chipsets prone to full channel occupancy, as most modern Wi-Fi modems are not prone to excessive channel occupancy.

thumbWhile overlapping frequencies can be configured