An unobstructed view from transmitter to receiver. Satellite, infrared (IR) and microwave transmissions require line of sight between nodes, whereas portable phones, cellphones and wireless LANs (Wi-Fi) do not. Bar code systems must also have line of sight between the scanner and the printed bar codes on items. Contrast with RF.
 | Reproduced with permission from Computer Desktop Encyclopedia. Copyright (c) 1981-2008 The Computer Language Company Inc. All rights reserved. |
Additional Resources
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