Channels in the 2.4-GHz ISM Band

In the 2.4-GHz ISM band, the frequency space is divided up into 14 channels, numbered 1 through 14. With the exception of channel 14, the channels are spaced 5 MHz apart, as listed in Table 2-5.


Table 2-5 IEEE 802.11 Channel Layout in the 2.4-GHz Band

The 802.11 standard allows either direct-sequence spread spectrum (DSSS) or Orthogonal frequency-division multiplexing (OFDM) modulation and coding schemes to be used in the 2.4-GHz band. DSSS radios require each channel to be 22 MHz wide, and OFDM requires 20 MHz. Either way, with only 5 MHz between channels, transmissions on neighboring channels are bound to overlap ...

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