[ntp:questions] .1 Microsecond Synchronization

Unruh unruh-spam at physics.ubc.ca
Fri Jun 5 20:14:51 UTC 2009

Rob <nomail at example.com> writes:

>Unruh <unruh-spam at physics.ubc.ca> wrote:
>> "Richard B. Gilbert" <rgilbert88 at comcast.net> writes:
>>>Harlan Stenn wrote:
>>>> The time on my cellphone is routinely more than 3 seconds off of GPS time.
>>>Is your cell phone "CDMA"?   Other technologies, there are several, may 
>>>not require the precise timing that CDMA does!
>> It will be hard for them to get CDMA in London, or Paris, or in fact anywhere in the world except
>> N America.

>It has always amazed me that in an all-digital system like GSM there is
>no standard way to communicate wallclock time from the network to the
>handhelds.  Even a once-per-hour time transmission that would sync the
>freerunning clock in the phone would be fine for most users.

>It seems there is some nonstandard stuff going around, e.g. my Nokia phone
>can be configured to receive time from the network but it does not work.
>Probably requires Nokia base stations.

No it requires the network to send the time when requested. Eg, Rogers
in Canada (GSM) does deliver the time but I have no idea what its
accuracy is. 

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