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Posts Tagged ‘rf’

Wireless for Beginners Part 2: Avoiding Collisions
Last Updated on Tuesday, 5 November 2013 10:54
Written by jj
Wednesday, November 6th, 2013

This article by Jennifer Minella originally appeared in Network Computing.

Part one of this introduction outlined the basics of radio frequencies and waves. Part two explores the challenges of the half duplex properties of wireless networking, and mechanisms for avoiding collisions that would disrupt traffic.

Wireless technologies, unlike wired IEEE 802.3 technologies, are half duplex. That means a wireless device (AP or endpoint) can listen or talk, but not both at the same time. In addition, in any given radio frequency (RF) region that contains multiple wireless devices, only one device can talk at a time. This creates difficulties in using RF as a shared medium. (more…)

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Wireless for Beginners Part 1: RF and Waves
Last Updated on Tuesday, 5 November 2013 10:50
Written by jj
Monday, November 4th, 2013

This article by Jennifer Minella originally appeared in Network Computing.

Wireless networking presents a unique set of challenges that have to be overcome to get information from point A to point B. Most of the quirkiness of wireless technologies has to do with the controls put in place to allow it to operate over the physical medium of the air. From collision avoidance to time slicing and even data rates, the functions and characteristics of wireless success (and failure) can most often be traced to the challenges of communicating over the air.

This series starts with an overview of wireless’s most often-overlooked but fundamental elements: the properties of RF and waves.  (more…)

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