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Abbrev. for interstellar medium.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

ISM band

(Industrial, Scientific and Medical band) A part of the radio spectrum that can be used for any purpose without a license in most countries. In the U.S., the 902-928 MHz, 2.4 GHz and 5.7-5.8 GHz bands were initially used for machines that emitted radio frequencies, such as RF welders, industrial heaters and microwave ovens, but not for radio communications.

In 1985, the FCC Rules (Part 15.247) opened up the ISM bands for wireless LANs and mobile communications. In 1997, it added additional bands in the 5 GHz range under Part 15.407, known as the Unlicensed National Information Infrastructure (U-NII). Europe's HIPERLAN wireless LANs use the same 5 GHz bands, which are titled the "Broadband Radio Access Network."

Numerous applications use the ISM/U-NII bands, including cordless phones, wireless garage door openers, wireless microphones, vehicle tracking and amateur radio. See U-NII.
                      Power LimitISM Bands               (Watts)902 - 928 MHz
   Cordless phones          1 W
   Microwave ovens        750 W
   Industrial heaters     100 kW
   Military radar        1000 kW

   2.4 - 2.4835 GHz
   Bluetooth              100 mW
   Wi-Fi - 802.11b/g        1 W
   Microwave ovens        900 W

   5 GHz
   5.725 - 5.825 GHz        4 W
   Wi-Fi - 802.11a/n/ac

   U-NII 5 GHz Bands
   Wi-Fi - 802.11a/n

   5.15 - 5.25 GHz        200 mW
   5.25 - 5.35 GHz          1 W
   5.47 - 5.725 GHz         1 W
   5.725 - 5.825 GHz        4 W

   60 GHz Band
   57 - 64 GHz (see  WirelessHD and  WiGig)
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References in periodicals archive ?
The basic lesson that modernism teaches, more clearly perhaps than any other -ism (in French studies, at least), is that one can and in fact must define each term one uses each time one uses it.[3] By wrestling with the definition of hard-to-pin-down movements (see suggestion 1 below), our students can find out for themselves that knowledge, like index cards, can fade, get misfiled, or be thrown out.
The chronological French civilization survey course I was assigned to teach is the last in a series of three, stretching from Napoleon I through to De Gaulle, and "covers" an -ism in a day or two (the academic equivalent of a frenzied bus tour through Europe).
These materials function at several levels: 1) they deliver content (and serve to motivate students who may be surprised to learn they can handle the language level despite their non-native status); 2) they are rich cultural documents that can be analyzed as such, providing, for example, valuable insight into the transmission of cultural values; and 3) because they are pedagogical materials, they heighten the students" awareness of the processes involved in organizing, delivering, and assimilating content (French students after all do focus on periodization, movements, -ism s, etc.).