[ntp:questions] what happens when sys.peer turns stratum 16?

Terje Mathisen "terje.mathisen at tmsw.no" at ntp.org
Wed Jun 2 13:53:47 UTC 2010

Rob wrote:
> Terje Mathisen<"terje.mathisen at tmsw.no">  wrote:
>> Kalle Pokki wrote:
>>>>  From my experience, hardware or well designed and tested software
>>> going crazy (i.e. outputting completely invalid data) without any
>>> safeguards noticing it usually requires quite bizarre double failures
>>> in the system at the same time. Thinking this I sometimes wonder the
>> I have personally seen three different NTP-GPS "black box" units, from
>> two different vendors, go "crazy", i.e. becoming falsetickers, with no
>> indication at all of any error condition. :-(
>> In one of the cases, the unit claimed the year to be 2035 or similar.
> Apparently their firmware is crap.
> But have you also seen this with bare GPS receivers?
> Wrong time but indication of lock to GPS (2D or 3D).


As i wrote in another msg, my primary NTP servers are all homebrew: 1U 
x86 server with RS232 port, FreeBSD with "option PPS_SYNC" custom 
kernel, Motorola Oncore UT+ T-RAIM capable gps units.


- <Terje.Mathisen at tmsw.no>
"almost all programming can be viewed as an exercise in caching"

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