[time-nuts] Lucent / Z3810A log time offset.
kb8tq at n1k.org
Sun Dec 7 16:49:53 EST 2014
> On Dec 7, 2014, at 4:11 PM, Paul <tic-toc at bodosom.net> wrote:
> On Sun, Dec 7, 2014 at 3:07 PM, Bob Camp <kb8tq at n1k.org> wrote:
>> The local time is updated *after* the GPS Valid hits the log. Put another
>> way, the time used for the log is *not* corrected to GPS time until after
>> the valid message is logged.
> And I completely agree with you.
> My point is the [GPS valid] timestamp that's part of the [GPS valid]
> message was at least 50 minutes off. Just the one time. Maybe the
> timestamp associated with this message:
> GPS reference valid at 20141202.01:47:41
> (01:47:41 in this case) as opposed to the Log timestame (00:25:47 in this
> case) is a random time that just happens to typically appear to be the
> current GPS time but that seems odd. However the system makes it just a
> bit tricky to compare box time to UTC so maybe all the timestamps are bogus.
> Log entry split into two lines:
> Log 037:20141201.00:25:47 (00:25:47 is current Z3810 time)
> GPS reference valid at 20141202.01:47:41 (01:47:41 is what I thought was
> current GPS time.)
> But if it is GPS time then this is a glitch:
> Log 043:20141201.00:25:42 (00:25:42 is current Z3810 time, this log entry
> is about 50 minutes after Log 037 above)
> GPS reference valid at 20141202.01:47:36 (01:47:36 is obviously not current
> GPS time)
That (and other log timestamp entry errors) is what leads me to believe that it is being “conservative” when it generates the timestamps. The log gets written *before* anything actually gets done.
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