The industrial,
scientific and medical (ISM) radio bands were
originally reserved internationally for the use
of RF electromagnetic fields for industrial, scientific
and medical purposes other than communications.
In general, communications equipment must accept
any interference generated by ISM equipment.
The ISM bands are defined
by the ITU-R in 5.138, 5.150, and 5.280 of the
Radio Regulations. Individual countries' use of
the bands designated in these sections may differ
due to variations in national radio regulations.
Because communication devices using the ISM bands
must tolerate any interference from ISM equipment,
these bands are typically given over to uses intended
for unlicensed operation, since unlicensed operation
typically needs to be tolerant of interference
from other devices. |