[ANSS-netops] xlak date stamp wrong

[mwithers at memphis.edu]

We were manually able to reset the dates and it seemed to keep the correct
date after a power cycle.  It was suggested that it might be a epoch rollover
of a 10 bit week number.  They occur a little more than every 19 years.  The
last one was in January 1999 so the next one shouldn't happen until 2019 
(more modern systems use 13 bits to store the week number).  Its possible
depending on how the firmware was written to handle the first rollover, that
subsequent rollovers would occurr on 19 year intervals with a static offset
from 1999.  That would mean that our clocks would return to 1994 (and I
think in fact that they did).  So perhaps it did rollover and the firmware
had the ability to recognize and account for the next rollover once we
manually intervened?

Unfortunately, now we have a few remote nodes to visit.

Mitch

Center for Earthquake Research and Information (CERI)
University of Memphis                Ph: 901-678-4940
Memphis, TN 38152                   Fax: 901-678-4734


On Sun, 18 Aug 2013, Oppenheimer, David wrote:

> Yes. We had a true time clock at remote EW node exhibit the same behavior.
> the hour minute were correct.  Wierd
>
>
> On Sun, Aug 18, 2013 at 9:18 AM, <mwithers at memphis.edu> wrote:
>
>>
>> Is anyone else who still uses analog data and gets time from an XLAK having
>> problems?  All of our clocks appear to have reset to Jan 2, 2013 at UTC
>> midnight last night.  This causes adsend to have the wrong date.  And if
>> you have adsend set to sync the system time to it, your system date is
>> wrong.
>>
>> Mitch
>>
>> Center for Earthquake Research and Information (CERI)
>> University of Memphis                Ph: 901-678-4940
>> Memphis, TN 38152                   Fax: 901-678-4734
>>
>>
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>
>
>
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> David Oppenheimer                   office: 650.329.4792
> U.S. Geological Survey              fax:    650.329.4732
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