I beleive this conversation was in the context of stand-alone. There are protocols that do a distributed clock adjust. They don't require a trusted clock source. Se FTSP.
eric On Fri, Jul 17, 2009 at 6:59 PM, Raffaele Gravina < [email protected]> wrote: > Well... i believe it's about time synchronization, isn't it? You need a > "trusted" source of clocking in order to correct your drift. Am i wrong? > > raf > > 2009/7/17 Eric Decker <[email protected]> > >> on the telosb it is done once on boot and then not done again. >> in other words it is something you have to figure out how to provide. >> Most of the pieces are in the code. >> >> eric >> >> On Fri, Jul 17, 2009 at 4:03 PM, Raffaele Gravina < >> [email protected]> wrote: >> >>> Which is the easiest way to correct it? Does TinyOS provide with a >>> specific api/component or is something one would do by himself? >>> - Raf >>> >>> 2009/7/17 Michael Schippling <[email protected]> >>> >>> One would have to look at the specs for the crystal used >>>> but something like .1% (or less) sticks in mind. Whatever >>>> it is, it seems small but actually leads to significant drift >>>> if not frequently corrected. >>>> >>>> MS >>>> >>>> Yi-Tao Wang wrote: >>>> > Hi, >>>> > >>>> > Does anyone know the clock skew I can expect from a tmote sky? >>>> > >>>> > Thanks, >>>> > >>>> > David >>>> > _______________________________________________ >>>> > Tinyos-help mailing list >>>> > [email protected] >>>> > >>>> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >>>> _______________________________________________ >>>> Tinyos-help mailing list >>>> [email protected] >>>> https://www.millennium.berkeley.edu/cgi-bin/mailman/ >>>> listinfo/tinyos-help >>> >>> >>> _______________________________________________ >>> Tinyos-help mailing list >>> [email protected] >>> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >>> >> >> >> >> -- >> Eric B. Decker >> Senior (over 50 :-) Researcher >> Autonomous Systems Lab >> Jack Baskin School of Engineering >> UCSC >> >> > > > -- > Raffaele Gravina | Research Engineer > > Wireless Sensor Networks Lab Berkeley > 2000 Hearst Ave, suite 304 > Berkeley, CA 94709 > +1 510 666 0174 ext. 101 > -- Eric B. Decker Senior (over 50 :-) Researcher Autonomous Systems Lab Jack Baskin School of Engineering UCSC
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