Take a look at a lot of the 802.11 sniffing software. They seem to be able to get the right dbm values from the card. For ~$3,000 for the Yellow Jacket I certainly hope their numbers are accurate. As far as I know the other software that does pretty much the same thing is just as accurate. So there must exist a formula somewhere that takes the numbers that Vasu mentioned (0 - 40 I think it was) coming from the card and converts that into a fairly accurate dbm number.
Just my 0.02. It is a little annoying to see 100% RSSI and the dbm readout says -10db. Also, just doing a straight average conversion from the 0-40 number to a 0-100% for RSSI might not be all that accurate either. I don't know what the specs are from the manufacturer, so I'm just running off at the fingers, but it's possible that 20 doesn't necessarily equate to 50%, it could only be 30%, and the ratio could be different the closer you get to 40. (just a thought.) I'm outa here for the weekend. Have a good one. Kevin Summers KISTech Internet Services Inc. www.kistech.com -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of phantam Sent: Friday, August 01, 2003 5:31 PM To: '[EMAIL PROTECTED]' Subject: RE: [smartBridges] Strange dbm values As far as I can tell they are accurate but u know I am just a measly tech, I could definitely be wrong but there accurate enough for me to tell if the links going to last or not, only bug ui hate is when it says 100(-95) 100 Which mathematically even is wrong. Has anyone PROVEN its incorrect yet and if so out by how much? Chris From: Ray [mailto:[EMAIL PROTECTED] Sent: Friday, August 01, 2003 7:52 PM To: [EMAIL PROTECTED] Not a flame Chris but not having accurate RSSI readings on a wireless link is pretty bad. ----- Original Message ----- From: phantam To: '[EMAIL PROTECTED]' Sent: Friday, August 01, 2003 3:54 PM Subject: RE: [smartBridges] Strange dbm values Perhaps the "do it yourself way" is to stop people from .. well pardon the word... to stop them from bitching that there invalid it's a basic way of saying "if you don't believe or don't like how we are calculating it calculate it for yourself, heres the fields have at it. Now if they shipped the simplemonitor with the fields BLANK then I would say there wrong but there not. And what other units exactly NON PCMCIA are the ones showing the power like this I mean really theres only a few that are really showing LQ and RSSI how properly they are I don't even know. But anyways that's JUST MY VIEW DON'T FLAME ME IF YOU DON'T AGREE. Chris -----Original Message----- From: Rob Genovesi [mailto:[EMAIL PROTECTED] Sent: Friday, August 01, 2003 6:26 PM To: [EMAIL PROTECTED] At 10:56 PM 8/1/2003 +0300, you wrote: >Jerr, > >If you do not feel confused enough, here is a whitepaper for ya : > >www.wildpackets.com/elements/whitepapers/ Converting_Signal_Strength.pdf Thanks for the link! This is a good read for anyone trying to learn the wifi game and understand how/why RSSI can be used. (up this point I wasn't even sure how it could be displayed as a percentage because I couldn't figure out what was being used to derive the max possible value). Cheers, Rob The PART-15.ORG smartBridges Discussion List To Join: mailto:[EMAIL PROTECTED] (in the body type subscribe smartBridges <yournickname> To Remove: mailto:[EMAIL PROTECTED] (in the body type unsubscribe smartBridges) Archives: http://archives.part-15.org --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.502 / Virus Database: 300 - Release Date: 7/20/2003 The PART-15.ORG smartBridges Discussion List To Join: mailto:[EMAIL PROTECTED] (in the body type subscribe smartBridges <yournickname> To Remove: mailto:[EMAIL PROTECTED] (in the body type unsubscribe smartBridges) Archives: http://archives.part-15.org
