[ntp:questions] stupid, simple question about precision

David J Taylor david-taylor at blueyonder.co.not-this-bit.nor-this-part.uk
Tue Nov 21 07:55:37 UTC 2006

Richard B. Gilbert wrote:
> Simple Simon wrote:
>> Is your GPS directly updating your hardware, or is your SPARC an NTP
>> client of a Stratum 1 timeserver connected to the GPS, or... ?
> My GPS is connected directly to serial port "B" on the Sun Ultra 10.
> The PPS signal is connected to the DCD Pin.  The Sun also uses a bunch
> of Internet servers as a backup and sanity check.  Normally, the GPS
> is the selected synchronization source.  This gives me a platform from
> which I can evaluate internet servers and NTP over internet.

I have a similar arrangement to Richard's, with the serial port providing 
the "which second am I" data, and the DCD line providing the "here is the 
precise on-the-second edge" signal.


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