[ntp:questions] .1 Microsecond Synchronization

Rob nomail at example.com
Fri Jun 5 20:25:21 UTC 2009


Unruh <unruh-spam at physics.ubc.ca> wrote:
> 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. 

How dumb...  something like time-of-day should be broadcast just like
cell broadcast and everyone would be able to receive it without any
requesting.
Still I think I have read it is manufacturer specific.  Rogers may be
using Nokia equipment in their network.




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