Mailing List os2-wireless_users@2rosenthals.com Archived Message #5507

From:	"Lewis G Rosenthal" <os2-wireless_users@2rosenthals.com>	Full Headers Undecoded message
Sender:	"OS/2 Wireless Users Mailing List" <os2-wireless_users@2rosenthals.com>
Subject:	[OS2Wireless] Xbox 802.11b/g (2.4GHz) interference (was: Re: [OS2Wireless] First large-scale 802.11n wireless LAN...)
Date:	Thu, 29 Nov 2007 15:14:52 -0500
To:	"OS/2 Wireless Users Mailing List" <os2-wireless_users@2rosenthals.com>

On 11/29/07 05:27 am, Ed Durrant thus wrote : Will Honea wrote: ** Reply to message from "Lewis G Rosenthal" <os2-wireless_users@2rosenthals.com> on Wed, 28 Nov 2007 21:23:39 -0500 I don't see how there can be "alternatives" to other people jamming noise in the 2.4GHz spectrum, Leon... Lew, there are some interesting frequency-hopping techniques that work well in such an environment, although my math says that with the limited number of channels (11) for target center frequencies even the most elaborate spread-spectrum techniques become saturated fairly quickly. The problem with any of it is that most of us don't have military type capability needed to deploy the really good ones (and the black helicopters would just create more problems if we tried <g>). Hey, I'm going to bounce emails for a day or two while I get the hosting and domain crap straight, so don't cut me off the list, please. No problem, Will... Also while "N" is not a certified standard - it could be said that it is the problem not the X-Boxes ! By all accounts the Draft N used by some companies use several frequencies at the same time and that can't be fair in what is a busy spectrum anyway ! Okay, it looks like I should have started a different thread for my comments concerning the Xbox interference. I've corrected that, above. To recount, and to quote from the article at hand: One novel problem has been the disruptive interference in the 2.4GHz band caused by Microsoft Xbox game consoles. Barber and his team noticed a strange pattern of interference: a strong signal jumping around all the channels on that band. The team gradually narrowed the interference down to a few areas in some dorms, and by a process of elimination focused on game consoles. To confirm it, Barber brought in his own Xbox from home, plugged it in, and found the same “very strong, crazy interference” pattern showing up on the radio-frequency analyzer. “It was even worse with multiple Xboxes in a given location,” he says. So far MSC hasn’t come up with a solution. But it was found that shielding the Xboxes with the antistatic bags used to protect electronic equipment from electrostatic discharge during assembly and shipping led to a noticeable drop in interference. It’s probably not a long-term solution because “that’s not good for the heat [level],” Barber says. This is not specific to 802.11n, but rather a concern for b and g clients. Leon, your point about using subchannels is moot when discussing client connections to an AP. Between carrier grade AP's, yes, but I've never seen a client with the ability to use subchannels (and that's not part of the 802.11b or g specs, AFAIK). The solution is for Microsoft to fix their broken boxes. -- Lewis ------------------------------------------------------------ Lewis G Rosenthal, CNA, CLP, CLE Rosenthal & Rosenthal, LLC Accountants / Network Consultants New York / Northern Virginia www.2rosenthals.com eComStation Consultants www.ecomstation.com Novell Users Int'l www.novell.com/openenterpriseserver Need a managed Wi-Fi hotspot? www.hautspot.com ------------------------------------------------------------ =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= This message is sent to you because you are subscribed to the mailing list <os2-wireless_users@2rosenthals.com>. To unsubscribe, E-mail to: <os2-wireless_users-off@2rosenthals.com> To switch to the DIGEST mode, E-mail to <os2-wireless_users-digest@2rosenthals.com> To switch to the INDEX mode, E-mail to <os2-wireless_users-index@2rosenthals.com> Send administrative queries to <os2-wireless_users-request@2rosenthals.com> To subscribe (new addresses), E-mail to: <os2-wireless_users-on@2rosenthals.com> and reply to the confirmation email. Web archives are publicly available at: http://lists.2rosenthals.com This list is hosted by Rosenthal & Rosenthal, LLC P.O. Box 281, Deer Park, NY 11729-0281. Non- electronic communications related to content contained in these messages should be directed to the above address. (CAN-SPAM Act of 2003) =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

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