Receive new posts as email.
RSS 0.91 | RSS 2.0
RDF | Atom
Podcast only feed (RSS 2.0 format)
Get an RSS reader
Get a Podcast receiver
| Sun | Mon | Tues | Wed | Thurs | Fri | Sat |
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | |
| 7 | 8 | 9 | 10 | 11 | 12 | 13 |
| 14 | 15 | 16 | 17 | 18 | 19 | 20 |
| 21 | 22 | 23 | 24 | 25 | 26 | 27 |
| 28 | 29 | 30 | 31 |
This site operates as an independent editorial operation. Advertising, sponsorships, and other non-editorial materials represent the opinions and messages of their respective origins, and not of the site operator or JiWire, Inc.
Entire site and all contents except otherwise noted © Copyright 2001-2006 by Glenn Fleishman. Some images ©2006 Jupiterimages Corporation. All rights reserved. Please contact us for reprint rights. Linking is, of course, free and encouraged.
Powered by
Movable Type
« DoCoMo Plans Converged Service | Main | Converged Handsets Are Appearing »
Matthew Gast crunches and improves Cisco’s simultaneous VoIP over WLAN call estimates for 802.11b: Gast, author of the recently released 802.11 Wireless Networks: The Definitive Guide, 2nd Edition, uses Cisco’s calculations for overhead and throughput to figure out how many VoWLAN calls could be made at the same time using 802.11b, which is still considered a standard for Wi-Fi VoIP on the receiver end.
The results aren’t pretty: if all 802.11b devices are running at 11 Mbps, you can achieve from 11 to 15 calls depending on voice encoding factors. This is why a lot of institutions are considering or deploying 802.11a for VoIP: they’ll be able to handle dozens of calls on a single AP and deploy APs densely in the same area without overlap.
Posted by Glennf at June 3, 2005 1:16 PM
Categories: limitations
TrackBack URL for this entry:
Discussion of this issue is not complete unless we also look at Cisco's own documents:
http://www.cisco.com/en/US/products/hw/phones/ps379/products_white_paper0900aecd800f6d97.shtml
http://www.cisco.com/en/US/products/hw/wireless/ps430/products_technical_reference_chapter09186a008043a3a4.html
which say that it can handle seven G.711 calls.
http://www.cisco.com/en/US/products/hw/phones/ps379/products_implementation_design_guide_chapter09186a00802a0a05.html
also says that no more that 15 to 25 802.11b devices associated to an AP, which is important if you have a lot of 802.11b phones ando ther devices located in a confined area, such as a conference room or lecture hall.
Frank Bulk
Posted by: Frank Bulk at June 3, 2005 2:58 PM