[time-nuts] Good references on holdover?

pablo alvarez pabloalvarezsanchez at gmail.com
Thu Apr 2 06:35:42 EDT 2015

Hi Javier,

As far as I understand in WR both references are synchronous. Why don't you
try to track both references (or N references) simultanously? If you take
care of the design, your performance should increase while locked and the
transition from one reference to the other if you ever miss one should be



On Fri, Feb 6, 2015 at 10:21 AM, Javier Serrano <
javier.serrano.pareja at gmail.com> wrote:

> Dear all,
> We would like to start working on holdover performance for White
> Rabbit [1]. This is a new domain for us. Our main use case is a WR
> switch losing its reference because someone disconnects a fiber. We
> can have redundancy, but it will take some time for a switch to change
> over to another reference. During this time, the oscillator in that
> switch will be free-running. We want to minimize the phase drift
> during that interval, which we think should be a couple of seconds
> maximum. We have never worked on holdover, and I am wondering if we
> can do something smarter than the obvious feeding of some constant
> voltage to the VCXO, based on averaging during the locked state. Does
> anybody know of any good references on holdover?
> Thanks!
> Javier
> [1] http://www.ohwr.org/projects/white-rabbit/wiki
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