[ntp:questions] What level of timesynch error is typical on Win XP?

Kevin Oberman oberman at es.net
Fri Oct 22 20:35:04 UTC 2010


> From: "David J Taylor" <david-taylor at blueyonder.co.uk.invalid>
> Date: Fri, 22 Oct 2010 20:43:01 +0100
> Sender: questions-bounces+oberman=es.net at lists.ntp.org
> 
> 
> "Evandro Menezes" <evandro at mailinator.com> wrote in message 
> news:f13f950a-3168-4a11-ba09-f4d225e7b6b1 at t13g2000yqm.googlegroups.com...
> > On Oct 22, 10:23 am, "David J Taylor" <david-
> > tay... at blueyonder.co.uk.invalid> wrote:
> >> That could explain why I see higher NTP jitter on a Windows system 
> >> running
> >> a USB network source (digital video data stream) than receiving a 
> >> similar
> >> data stream on a PCI card under either Windows XP or Windows-7.
> >
> > Possibly, but USB, as a polled, token-ring like protocol, will always
> > add jitters in this case.
> 
> Thanks.  I don't understand enough about USB - do you have good reference?

For a good into, read the Wikipedia article:
http://en.wikipedia.org/wiki/Universal_Serial_Bus 
-- 
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman at es.net			Phone: +1 510 486-8634
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