[time-nuts] worst case jitter of PTP (IEEE1588) derived clock?

[Chris Caudle]

Has anyone found reference which derives the worst case clock jumps to
expect when using PTP (IEEE1588-2008) and how to derive a phase  noise
spectrum from that?
I'm looking at a protocol which uses 1588-2008 to create a common clock
between networked devices, and those devices are supposed to derive other
clocks (e.g. sampling clocks) synchronized to the 1588 clock.  If you are
locking a sampling clock to that, you will need to know the worst case
phase noise so you can design the PLL bandwidth, etc.  So far haven't
found the right reference which derives that, just some very gross maximum
offset type of numbers, nothing which shows whether you might go +/-
maximum offset in one cycle, or whether it drifts slowly to that level of
offset, etc.

I don't recall seeing much about PTP (Precision Time Protocol) on the
list, compared to NTP. Are many people using it yet?

-- 
Chris Caudle