From owner-freebsd-mobile@FreeBSD.ORG Thu May 27 07:58:10 2010 Return-Path: Delivered-To: freebsd-mobile@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 2603D106564A for ; Thu, 27 May 2010 07:58:10 +0000 (UTC) (envelope-from mira@chlastak.cz) Received: from mail.intime.cz (mail.intime.cz [88.208.96.252]) by mx1.freebsd.org (Postfix) with ESMTP id 0872B8FC0A for ; Thu, 27 May 2010 07:58:08 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by mail.intime.cz (Postfix) with ESMTP id AFAE8814856; Thu, 27 May 2010 09:58:09 +0200 (CEST) X-Virus-Scanned: amavisd-new at mail.intime.cz Received: from mail.intime.cz ([127.0.0.1]) by localhost (mail.intime.cz [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id q5ILk-C6ZzPH; Thu, 27 May 2010 09:58:08 +0200 (CEST) Received: from [192.168.200.100] (192.13.broadband2.iol.cz [83.208.13.192]) by mail.intime.cz (Postfix) with ESMTPSA id 0AFA7833458; Thu, 27 May 2010 09:58:08 +0200 (CEST) Message-ID: <4BFE260D.1090701@chlastak.cz> Date: Thu, 27 May 2010 09:58:05 +0200 From: Miroslav Chlastak User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.9pre) Gecko/20100308 Lightning/1.0b1 Shredder/3.0.4pre MIME-Version: 1.0 To: Rui Paulo References: <4BFD9FE4.3090309@chlastak.cz> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: freebsd-mobile@freebsd.org Subject: Re: Atheros and how to convert RSSI to dBm X-BeenThere: freebsd-mobile@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Mobile computing with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 27 May 2010 07:58:10 -0000 On 27.5.2010 02:16, Rui Paulo wrote: > On 26 May 2010, at 23:25, Miroslav Chlastak wrote: > > >> Hello, >> >> is there a way how to convert RSSI from output of "ifconfig ath0 list sta" to dBm?: >> >> [snip] >> >> ADDR AID CHAN RATE RSSI IDLE TXSEQ RXSEQ CAPS FLAG >> 00:4f:62:1d:d8:5d 14 9 11M 18.5 0 15932 22400 ES A >> >> [snip] >> >> I my test enviroment I use this function: >> noise floor + RSSI*2 = signal of client in dBm >> >> Then i get the same value as from "tcpdump -n -i ath0 -p -y IEEE802_11_RADIO": >> >> [snip] >> >> 10:41:04.746395 86402611933us tsft short preamble 58.5 Mb/s -61dB signal -98dB noise antenna 1 [0x00000012] IP 10.0.0.1.2049> 192.168.100.2.123: NTPv3, Client, length 48 >> >> [snip] >> >> >> Right? Or is this conversion "stupid"? Some better idea? >> >> Is there a way how to get noise floor via "ifconfig"? I get it from output of "athstats" :( >> > No, there's no way right now. > > Check this: http://lists.freebsd.org/pipermail/freebsd-stable/2006-September/028895.html > > Regards, > -- > Rui Paulo > > > But this mail was sent on September 2006 - it's still impossible? :( And how to do it tcpdump? tcpdump -n -i ath0 -p -y IEEE802_11_RADIO": [snip] 10:41:04.746395 86402611933us tsft short preamble 58.5 Mb/s -61dB signal -98dB noise antenna 1 [0x00000012] IP 10.0.0.1.2049> 192.168.100.2.123: NTPv3, Client, length 48 [snip] Signal -61dB is right signal of my connected wireless client. Tcpdump this signal "know", but system (via ifconfig) doesn't? -- Mira Chlastak