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A Bit More Detail on the 2.4 GHz Band
• The 2.4 GHz band is a license exempt frequency allocation of
2.400 to 2.4835 GHz for Industrial, Scientific and Medical (ISM)
use. It is available Worldwide.
• The ISM band is unlicensed / license exempt, but it is not
unregulated. In the USA, the bands are covered by FCC CFR
47 part 15. In Europe, by ETS 300 328. In Japan, by ARIB
STD-T66
• The FCC and ETSI have historically had very specific guidelines
for modulation used in the 2.4 GHz band. Hence many of the
systems have similar physical layer specs. CCK modulation is
unusual, it “bent the rules” to create a signal that can carry 11
Mbps rather than 2 Mbps.
• FCC have since relaxed rules further to allow OFDM at 2.4 GHz
