Yo Rodolfo! On Tue, 10 Sep 2013 09:31:05 +0200 Rodolfo Giometti <giometti@xxxxxxxxxxxx> wrote: > I have nothing against with this solution but consider that reporting > a PPS signal through USB bus may add unknown delays that may vanish > clock stability... as far as I know you should not use USB serial port > with PPS. Have you some statistics about clock stability in a real > implementation? gpsd project has been using PPS over USB 1.1 for over a year. Typical accuracy and repeatability in the range of +/- 1 milliSec. This is much better than you can get using simple ntp over gigabit ethernet to an adjacent stratum 1 server. Sure PPS over a local UART is 10 to 100 times better, but often PPS over USB is your best second choice. As serial ports become extinct it may become your best choice. RGDS GARY --------------------------------------------------------------------------- Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97701 gem@xxxxxxxxxx Tel:+1(541)382-8588
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