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…)