[ntp:questions] .1 Microsecond Synchronization

Richard B. Gilbert rgilbert88 at comcast.net
Sat Jun 6 18:52:33 UTC 2009

Rob wrote:
> Richard B. Gilbert <rgilbert88 at comcast.net> wrote:
>>> 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.
>> Time is broadcast!  WWV, WWVB, CHU, JJY, etc.  Most radio and TV 
>> stations broadcast the time; "At the tone the correct time will be. . . 
>> ."  Many radio and TV stations get the time directly from WWV and 
>> rebroadcast the tone from WWV.
>> CMDA base stations also broadcast the time.  I'm not sufficiently 
>> familiar with the other technologies to be able to state that they do, 
>> or do not, supply correct time to the phones they serve.
> Of course I mean "broadcast on the GSM network".  That is where a GSM
> phone is listening.  It cannot receive WWV.
> It should be trivial to send a datagram with current time at some
> interval on such a digital phone network, but apparently this was not
> foreseen in the standard.

The past is paved with the remains of standards that failed to foresee 
something!  Why should GSM be any different?  I'm sure that the primary 
consideration was making the phone system work.

I find it easier to look at my wristwatch than to dig my cell phone out 
of of my pocket.

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