[ntp:questions] Re: GPS Truetime NTP server and offset/jitter peak

Ralf Gross usenet at ralfgross.de
Thu Oct 20 10:41:40 UTC 2005


Martin Burnicki wrote:
> Ralf Gross wrote:
>> John Pettitt wrote:
>>> Ralf Gross wrote:
>>>> Martin Burnicki:
>>>> 292:23:59:59
>>>> 292:23:59:60
>>>> 293:00:00:00
>>> 
>>> 
>>> !!!!!!!!!!!!!!!!!   59:60 !!!!!!!
>> 
>> DOH! I overlooked that :(
>> 
>>>> 293:00:00:01
>>> 
>>>> I only noticed a gap between second 21 and 23.
>>>> 
>>> I think the 59:60 is more the cause of the problem!  That should only
>>> happen when there is a leap second.
>> 
>> Ok, does this mean the NTS-100-GPS FW is buggy?
> 
> Yep. 

:(

>> Should I ignore the peak, 
>> because it will hopefully disappear after 12/31/2005?
> 
> If you don't get a firmware upgrade, and you can live with it, you can just
> wait. 

There is no firmware for the NTS-100 listed at
<http://www.symmetricom.com/support/ttm-swlist.aspx>

> Probably the receiver will work correctly again at the beginning of January.
> Currently the GPS satellites are sending 13 and 14 for UTC offset from UTC
> time before and after the leapsecond. In January, shortly after the leap
> second, they will probably start to send 14 for both values and your
> problems will disappear. 

As long as I have not to expect further problems, I'll wait until January
and see what happens. 

> You can find more details on GPS UTC/leap second parameters in two of my
> earlier articles which are archived in the NTP questions mailing list
> archives:
> http://lists.ntp.isc.org/pipermail/questions/2005-September/006543.html
> http://lists.ntp.isc.org/pipermail/questions/2005-September/006528.html

Thanks for the links!

Ralf




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