[ntp:hackers] Reduce jitter of refclocks (connected via USB)

David J Taylor david-taylor at blueyonder.co.uk
Mon Mar 14 13:08:28 UTC 2011

> Hi,
> I am running a Meinberg USB 5131 DCF77 Radio Clock. The clock works
> quite good. I know that USB is a very poor solution for timekeeping, but
> I had no other choice since my mini pc has no serial interface and
> there's no free PCI slot.
> I noticed that there's a jitter of about (exactly?) 1 ms. As the device
> works with USB 1.1 (Full Speed), I assume that the jitter is a result of
> an additional interrupt interval in some cases, leading to an additional
> error of 1 ms.
> I'm open-minded about your comments on this idea.
> Cheers
> Volker

What operating system are you running, Volker?

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Email:  david-taylor at blueyonder.co.uk 

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