On Tue, Sep 30, 2008 at 10:47:05AM -0700, Lawrence Stewart wrote: > > On Sep 30, 2008, at 12:07 PM, Lux, James P wrote: > > > > The grottiest grungy GPS receiver can probably do 100ns on its 1pps > > tick, > > and most are in the 20ns range. There ARE receivers that have > > systematic > > errors (i.e. Some sort of sawtooth in the error) and, of course, > > there are > > countless schemes to compensate in one way or another. > > So someone with some grad students and soldering irons should hook up > the 1 pps > output of a GPS to, say, the carrier detect pin on the unused RS232 > ports of all their > nodes, and write some software...
Using GPS receivers to drive the system clock, e.g., for your own private low-stratum NTP master, is well described and easily accomplished. Doing the same with a WWVB, MSF, DCF RX is also well described. For WWVB, at least, it's sadly tougher to get the parts in single quantity :( GIYF in any event... -- David N. Lombard, Intel, Irvine, CA I do not speak for Intel Corporation; all comments are strictly my own. _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
