Slightly different question, based on answer below. If you had multiple 802.11 links in the same area, would it be possible to assign fixed "channels" to the most important ones, and exclude less important links from intruding on those? Also, could other links such as Bluetooth be controlled so as not to occupy the same bandwidth? -- Ken Javor
Phone: (256) 650-5261 > From: "Barker, Neil" <[email protected]> > Date: Tue, 14 Aug 2007 16:51:06 +0100 > To: 'Ken Javor' <[email protected]>, [email protected] > Subject: RE: 802.11 & similar wireless links, interference between > > Ken, > > I cannot quantify the effects, but I have a few observations:- > > A great deal will depend on the volume of 'traffic' on the link; occasional > data downloads from a host or server are likely to be much more robust than > applications such as streaming video. > As an example, one recent 802.11 product that streams video has performed > well on tests in the factory, but suffered from significant degradation at a > trade show where there were undoubtedly many other devices using the same > technology. > Much depends on the local configuration; where a device is operating in > infrastructure mode, it is often easy to change channels, but where a device > is in ad-hoc mode it is not uncommon for it to be set to a default of > Channel 1, which is consequently heavily populated. > Perhaps somebody who knows more about data density and the maths of channel > sharing can provide some correlation between data rate and the probability > of degradation dependent on the population distribution of WLANs operating > (given that a typical transmitter has up to about 300m range). > > Best regards > > Neil R. Barker CEng MIET HonFSEE MIEEE > Manager > Quality Engineering > e2v technologies (uk) ltd > 106 Waterhouse Lane > Chelmsford > Essex CM1 2QU > UK > > Tel: (+44) 1245 453616 > Fax: (+44) 1245 453571 > Mob: (+44) 7801 723735 > > P Please consider the environment before printing this email. > > > > -----Original Message----- > From: Ken Javor [mailto:[email protected]] > Sent: 14 August 2007 16:15 > To: [email protected] > Subject: 802.11 & similar wireless links, interference between > > > Does anyone have any experience, either specs/standards or empirical > concerning how many of these type links can operate in the same area before > degradation begins. I realize "area' Is not a specific term, but the idea > is that within one factory building, how many 802.11, Bluetooth or other > co-frequency links can operate simultaneously without upset or degradation? > > Thank you, > > Ken Javor > > Sent by E2V TECHNOLOGIES PLC or a member of the E2V group of companies. A > company registered in England and Wales. Company number: 04439718. > Registered address: 106 Waterhouse Lane, Chelmsford, Essex, CM1 2QU, UK. - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
