[ntp:questions] IEEE 1588 (PTP) at the nanosecond level?

Brian Inglis Brian.Inglis at SystematicSw.ab.ca
Wed Mar 19 23:04:32 UTC 2014

On 2014-03-19 16:32, Paul wrote:
> On Wed, Mar 19, 2014 at 6:16 PM, Brian Inglis <
> Brian.Inglis at systematicsw.ab.ca> wrote:
>> Each constellation has its own epoch, TAI or UTC time scale, and
>> uncertainty:
> I'm unclear how various time scales relate to PTP.  It would appear that
> the design intent is local (LAN) process control.  And while that might
> subsume diverse goals time transfer between national labs (even on the same
> continent) seems out of scope.
> But perhaps the OP has such interests.

The PTP timescale is TAI and the GM broadcasts the UTC offset.
The examples given show the limits of accuracy and precision
achievable using national standards.
While 1ns precision may be doable, accuracy depends on what
controls the GM, and its traceability to a reference.

Take care. Thanks, Brian Inglis

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