I don't know if I interpret this sentence correctly:
"In case the grandmaster-capable clock has no time reference signal, IEC 61588:2009 ¦ IEEE Std 1588-2008, J.4.4.1 shall apply.".
J.4.4.1
"Every grandmaster clock shall maintain a frequency deviating no more than 0.01% from the SI second."
So, if the clock doesn't have time reference signal, the inaccuracy can be at most 0.01% of the SI second, which is 100us.
Proposal
Am I understanding this correctly?
Discussion
Created
Status
N/A
28 Nov 23
Not Applicable
Yes. That is what I meant. Thank you for confirming. I was wondering since it is so far from the 250ns requirement when there is time reference signal.
06 Sep 23
Approval (N/A)
A more correct statement would be "the maximum drift is 100 microseconds per second at any combination of temperature, aging, input voltage, etc.". Does this answer your question?
06 Sep 23
Approval (N/A)
The frequency shall not deviate more than 0.01%, not the absolute accuracy.
This means that the oscillator of the grandmaster-capable clock shall have an accuracy not worse that 100 PPM.