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« Vonage Releases VoWLAN Phone | Main | NetGear Introduces Skype Wi-Fi Phone »

December 15, 2005

How Many Calls Per AP?

By Glenn Fleishman

Matthew Gast runs the numbers to find out how many simultaneous calls are practical per access point: VoWLAN depends on having a great availability of access points in dense areas so that callers receive preferably wireline “dial tone” availability, or, at worst, cellular availability. Gast walks through the requirements for major coder/decoder (codec) routines used for VoIP. He provides tables and graphs for the maximum possible number of calls that could theoretically run across a network assuming no contention and all slots filled.

Gast shows the inherent benefit of 802.11a over 802.11g: 802.11a has no older standard to worry about; 802.11g must contend with (pun intended) 802.11b. Even a nominally all G network invokes protection whenever B packets are encountered, thus significantly reducing network throughput. Gast calculates that this protection of G packets in mixed B/G environments drops theoretical call capacity by one-quarter to one-third.

Posted by Glennf at December 15, 2005 3:21 PM

Categories: limitations


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