Warning: the following may be apocryphal. I was once told: Sprint PCS networks distributed very accurate time to cell phones because GPSDO & accurate time was essential to the multiplexing technology then in use. In contrast, time of day at an AT&T GSM cell site depending on the accuracy of the technician’s watch when setting up the site. Hence, each site could be many seconds different from its neighbors. I have never verified this information, and it is 10 years old.
> On 2015 Oct 21, at 01:41 , David J Taylor <[email protected]> > wrote: > > Has anybody else observed this with their iPhone since “upgrading” to iOS 9? > Anyone know of any difference in the reference time ( e.g. GPS vs. network > time) that Apple is using to “dumb down’ their smartphones in favor of Apple > Watch? > > Brian Garrett > ==================================== > > Yes, on one quick check, I now see an accuracy (or rather error) o my iPad of > up to several seconds (iOS 9.0.2) compared to my recollection of sub-second > accuracy under iOS 8.0.2x. > > My £50 Windows 10 tablet using real NTP does /much/ better! > > Cheers, > David > -- > SatSignal Software - Quality software written to your requirements > Web: http://www.satsignal.eu > Email: [email protected] > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.
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