Summary

  • Short-range wireless systems use unlicensed frequency bands. These can either be dedicated to communications or shared with ISM (Industrial, Scientific, and Medical) applications.

  • There are many incompatible wireless LAN standards, pushed by IEEE (the organization that developed Ethernet) and ETSI (the organization that develops GSM).

  • The most popular wireless LAN technology is IEEE 802.11b, which can run at up to 11 Mbps in the 2.4 GHz ISM band.

  • Higher capacities need to use higher frequencies. HiperLan2 and IEEE 802.11a both use the 5 GHz band and reach 54 Mbps.

  • Digital cordless voice systems provide call quality as good as a regular telephone. Their analog equivalents usually suffer from severe interference.

  • Infrared technology is built ...

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