From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from nm9-vm10.access.bullet.mail.bf1.yahoo.com (nm9-vm10.access.bullet.mail.bf1.yahoo.com [216.109.114.201]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (Client did not present a certificate) by huchra.bufferbloat.net (Postfix) with ESMTPS id 3E9ED21F9FA for ; Thu, 8 Oct 2015 08:19:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rogers.com; s=s2048; t=1444317540; bh=f0Quk2gbM6DEWONmk2lM0l6O6/7To84HkfCjPSvH1oQ=; h=Reply-To:Subject:References:To:From:Date:In-Reply-To:From:Subject; b=mk/nD9OKJzdqHbNzZlsYBq2seeVGBDsRikxOouf9l0pIQqVlMx8BgJ0Pcx3RlS2LDqnxb5nch4HVDsi3M7f/o7BrSf+c7gs8MFQ/3W5PGjHBbm0/2JERe0Kr2YuHc6+ZC22BGL7CxiLJdwXXeX7yr4ze4lKvji/11qfPSCDS1IbkH959K2CnJtSOxIe1A/amOOD0aereKjZIwwGJQlDFBzQp2Je12vMu4D55hCHxlGmR7g8+EKn/WAngwAfIjnKxOy90W3vxlE6/osec5TC1ihYok+n9PjNvHZKA/cKmpnezjsMMW+8QIvUgDqLK8xJote5TUzRkDFaB0ChF3O69cw== Received: from [66.196.81.163] by nm9.access.bullet.mail.bf1.yahoo.com with NNFMP; 08 Oct 2015 15:19:00 -0000 Received: from [98.138.104.100] by tm9.access.bullet.mail.bf1.yahoo.com with NNFMP; 08 Oct 2015 15:19:00 -0000 Received: from [127.0.0.1] by smtp120.sbc.mail.ne1.yahoo.com with NNFMP; 08 Oct 2015 15:19:00 -0000 X-Yahoo-Newman-Id: 37462.11052.bm@smtp120.sbc.mail.ne1.yahoo.com X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: Fo5bBRkVM1l10iEF4EsNVu_BYTybQASirGDR426OZjzPAh1 wAeKFoz2RU5dSxTvsB5xWUkmsPoSzznlQIsTkCmAzL4xNA2MfhTad6j9dWNl mu83uPBbXMKukzPlaZmK_6coNLkgTCKlkyW9Z6leH44nJ1MdNXSdKfr7wzXD EbpmRqviYo3sSB53MQrngPUjvG1r7SqfQ8BvsL9kieSPl4dNTC2BkJXMSe0w ofguZRwmQNRDdN5eFICiVGszBCVWGpSXH0Kn4DILU5Z8r67PbGLxT53ZeGBM DahpKZ_SI3q5qmv2mdXraq41vmfWezt9yOizeoudyFg9f35qImRNfN_g0TXs jZaI6f1nvBWXFtUPqQ7V3BtMEXt5jCYq4DwRGYZRn6eCepphRHzdd9861lcQ uAP3Er98OM5eKpPX0.GyX_mVE.Sl4yPYHLhFeNVc0zgM0IiyINan.7xVy30. odZmscz3u_tAU0WNKGEVB63c8VRIh0L1IRP6aVRaj4eGrXatfjPKSaeir7SO mJsrMt1myhGJoMyYDm0o6HNhJHYr.hYfyC3edBfvZ3eg- X-Yahoo-SMTP: sltvjZWswBCRD.ElTuB1l9j6s9wRYPpuyTNWOE5oEg-- References: <561679A7.80400@rogers.com> <20151008144147.GB5171@thyrsus.com> To: bloat@lists.bufferbloat.net From: David Collier-Brown Message-ID: <56168961.2080800@rogers.com> Date: Thu, 8 Oct 2015 11:18:57 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.1.0 MIME-Version: 1.0 In-Reply-To: <20151008144147.GB5171@thyrsus.com> Content-Type: multipart/alternative; boundary="------------060001000109030102010202" Subject: Re: [Bloat] ESR's comment popped up on slashdot X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list Reply-To: davecb@spamcop.net List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 08 Oct 2015 15:19:29 -0000 This is a multi-part message in MIME format. --------------060001000109030102010202 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Solandri wrote, at http://tech.slashdot.org/comments.pl?sid=8141531&cid=50686089 > So based on a few vague comments, I managed to track down what the > issue is since neither this nor the previous/. article nor the sites > opposed to it (who seem to want to portray it as a Big Evil Government > conspiracy to take away your freedom) delve into it. > > Several airports useTerminal Doppler Weather Radar > [wikipedia.org] > for high-resolution maps of storms, rainfall, and most importantly > (for airports)microbursts > [wikipedia.org]. TDWR > operates at frequencies from 5.60 - 5.64 GHz. That's smack dab in the > middle of the5 GHz band used by 802.11a, n, and ac > [wikipedia.org]. > You'll notice use of those specific frequencies (channels 120, 124, > 128) are prohibited in the U.S. and Canada for this reason. > > Based on that, it sounds like the issue is that you can buy a 5 GHz > device off the shelf, then hack the firmware to re-enable those > frequencies. And the FCC is proposing this action because people have > been doing exactly that and the FCC has received reports from the > airports of such interference on those frequencies. If this is correct, it argues for various of our proposals and opens up some new questions... - is it a vendor that's scewed it up? - was there a bad DD-WRT athe solution is enforcement... anyone t any time? --dave -- David Collier-Brown, | Always do right. This will gratify System Programmer and Author | some people and astonish the rest davecb@spamcop.net | -- Mark Twain --------------060001000109030102010202 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: 8bit Solandri wrote, at http://tech.slashdot.org/comments.pl?sid=8141531&cid=50686089
So based on a few vague comments, I managed to track down what the issue is since neither this nor the previous/. article nor the sites opposed to it (who seem to want to portray it as a Big Evil Government conspiracy to take away your freedom) delve into it. 

Several airports use Terminal Doppler Weather Radar [wikipedia.org] for high-resolution maps of storms, rainfall, and most importantly (for airports) microbursts[wikipedia.org]. TDWR operates at frequencies from 5.60 - 5.64 GHz. That's smack dab in the middle of the 5 GHz band used by 802.11a, n, and ac[wikipedia.org]. You'll notice use of those specific frequencies (channels 120, 124, 128) are prohibited in the U.S. and Canada for this reason. 

Based on that, it sounds like the issue is that you can buy a 5 GHz device off the shelf, then hack the firmware to re-enable those frequencies. And the FCC is proposing this action because people have been doing exactly that and the FCC has received reports from the airports of such interference on those frequencies. 

If this is correct, it argues for various of our proposals and opens up some new questions...
- is it a vendor that's scewed it up?
- was there a bad DD-WRT athe solution is enforcement...  anyone
t any time?


--dave
-- 
David Collier-Brown,         | Always do right. This will gratify
System Programmer and Author | some people and astonish the rest
davecb@spamcop.net           |                      -- Mark Twain
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