CCNA Discovery 1, Chapter 7
7.1.1: Wireless devices use electromagnetic waves as the physical media for data transmission. Whereas infrared (IR) can transmit data over short distances, radio frequency (RF) waves are capable of distances and speeds necessary for networking. The following RF bands are used by unlicensed devices for communication. These bands are called the Industrial, Scientific, and Medical (ISM) bands.
• 900 MHz: This range (902 to 928 MHz) supports devices such as wireless headphones and cordless phones.
• 2.4 GHz: This range (2.400 to 2.4835) supports lower-speed, short-range Bluetooth as well as wireless LAN technologies that conform with IEEE 802.11 standards. Bluetooth is considered a better solution for short-range communication ...
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