Siemens IEEE802.11 - Manual (Page 20)

, © Siemens, 2002
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Frequency Hopping Spread Spectrum
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2.4GHz band is 83.5MHz wide (US & Europe)
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Band is divided into at least 75 channels
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Each channel is < 1MHz wide
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Transmitters and receivers hop in unison among
channels in a pseudo random manner
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Power must be filtered to -20db at band edge