From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from snark.thyrsus.com (static-71-162-243-5.phlapa.fios.verizon.net [71.162.243.5]) by huchra.bufferbloat.net (Postfix) with ESMTP id 4B19B200A34 for ; Fri, 16 Mar 2012 23:45:15 -0700 (PDT) Received: by snark.thyrsus.com (Postfix, from userid 1000) id 8DFC64081F; Sat, 17 Mar 2012 02:45:13 -0400 (EDT) Date: Sat, 17 Mar 2012 02:45:13 -0400 From: "Eric S. Raymond" To: Andrew McGregor Message-ID: <20120317064513.GA3482@thyrsus.com> References: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Organization: Eric Conspiracy Secret Labs X-Eric-Conspiracy: There is no conspiracy User-Agent: Mutt/1.5.21 (2010-09-15) Cc: thumbgps-devel@lists.bufferbloat.net Subject: Re: [Thumbgps-devel] PPS over USB Serial can work X-BeenThere: thumbgps-devel@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list Reply-To: esr@thyrsus.com List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 17 Mar 2012 06:45:15 -0000 Andrew McGregor : > I decided to try a practical experiment, to prove one way or another if USB > serial PPS on a consumer router can work, and how well. > > Short summary: it works, jitter is at the 300 µs level. Excellent! Any chance you can run a similar test with a PL2303? The FTDI SIO is only the second-most-likely converter to wind up in our device. I see PL2303 breakout boards are available for < $10 on eBay, though you might have to work a bit to find one that has pins for the handshake lines on the input side. -- Eric S. Raymond