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

unruh unruh at wormhole.physics.ubc.ca
Tue Jun 1 16:46:02 UTC 2010


On 2010-06-01, Rob <nomail at example.com> wrote:
> unruh <unruh at wormhole.physics.ubc.ca> wrote:
>>> If we assume there is a private subnet that has two GPS reference
>>> clocks to synchronize the rest of the machines, what would be the
>>> expected failure mode where one of the stratum 1 servers go crazy, and
>>> having three GPS clocks actually makes a difference?
>>
>> The gps falls off the roof and is burried in shrub, but still uses its
>> internal clock to deliver PPS pulses is an example.
>
> It requires a badly coded GPS driver to make the NTP clock sync to
> the GPS device while there are no satellites in view.   Any reasonable
> driver checks the status messages and uses the time info only when there
> is lock to the satellites.

The PPS has no status info, or any other kind of info, except a beep
every second. 




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