Subject: Re: [TICTOC] Principles of Robust Timing over the Internet

From: "STUART VENTERS" <[email-masked]>
Date: Wed, 5 May 2010 09:44:22 -0500

Danny,

Thanks for pointing out a good read.
   It's good to see published some of what's happened in private.

With regards to feeedback (IIR) versus feedforward (FIR) algorithms.

Using FIR turns the problem into a discrete time offset prediction problem which the control system folks know a lot about.
It also makes it much easier to compare measurements because the common timebase is not moving around.

The only thing I disagree with in his paper is that he hasn't gone far enough in the direction he's headed.

Regards,

Stuart

ps. He seems to have an exceptionally good local oscillator for a PC.

>>You may be interested in this article written by a couple of chaps in
>>Australia, just published by the ACM.

>>http://queue.acm.org/detail.cfm?id=1773943

>>There's also a PDF of it:
>>http://portal.acm.org/ft_gateway.cfm?id=1773943&type=pdf

>>I don't know if any of this will be helpful for tictoc but it's worth
>>sending out and their RADclock looks interesting.

>>Danny