Well, I seem to remember finding NTP running on my jail broken iPhone. But that was a few years ago.
> On Aug 3, 2014, at 17:41, Tim Shoppa <[email protected]> wrote: > > Unlike CDMA (where time distribution was an automatic part of the low-level > protocol) I suspect the time displayed on many modern phones is not set by > the telephony synchronous protocol but rather by IP-over-Wifi packets. > > And the packets don't seem to do a very effective job keeping the clock ont > he phone correct. My employer gave me a Nokia Lumia 630 "Windows Phone" and > its clock has always been off by at least a minute. > > There was a few years ago, a very nice article about the effort to repair > the clocks in clock towers in many cities. What rang most true to me was > "if you visit a town they can't even keep the clock correct, who else knows > what else is wrong there?". > > Tim N3QE > > > On Sun, Aug 3, 2014 at 4:37 PM, Brian Garrett <[email protected]> > wrote: > >> Hi all, >> >> First “time”r here. This may not rank up there with your degree of >> time-nuttery, but I haven’t been able to get an answer elsewhere. Recently >> I was discussing the issue of how the different cellular providers set >> their time, and I told him that I’d read that CDMA phones and towers have >> to have their clocks synced to GPS as part of the protocol, whereas GSM >> phones do not, and can theoretically be set to wall time, and thus phones >> on networks using CDMA would have atomic accuracy all the time since what >> they were getting was as good as GPS. >> >> Well, obviously I was pathetically behind the times. Most everybody these >> days including Verizon, which both I and my friend have now, uses LTE , as >> you know. I have looked all over for info as to what LTE’s time-setting >> requirements are, as implemented by Verizon, but I’ve not seen discussions >> of it anywhere. I’ve seen amusing anecdotes over what can happen if your >> Android isn’t set to receive the network’s time, or what can happen to your >> phone’s clock if you live near a time zone boundary, but no discussion of >> how time dissemination is handled in-network. I know my iPhone can be, and >> usually is, 2 or 3 seconds fast or slow when checked against an accurate >> reference clock, so I’m thinking they can just use wall time like GSM did. >> >> Has this been discussed on the list before? I haven’t seen anything in >> the archives, and no-one at Verizon that we of the unwashed masses have >> access to will know the answer Pointers, anyone? >> >> >> Thanks in advance, >> Brian >> _______________________________________________ >> 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. > _______________________________________________ > 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. _______________________________________________ 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.
