802.11n can function in "mixed mode" on the 2.4 GHz frequency, with a theoretical maximum speed of 300 Mbps, or on the 5 GHz frequency.
In the case of electrical current, frequency is the number of times a sine wave repeats or completes, a positive-to-negative cycle.
802.11n can operate in "mixed mode" on the 2.4 GHz frequency, which will support just 802.11b or 802.11g-capable systems but will slow the entire network down to the maximum speed of the earliest standard connected, at a theoretical maximum speed of 300 Mbps.
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