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Re: [NSIS] QSPEC Questions

Al Morton <acmorton@att.com> Thu, 06 November 2008 17:44 UTC

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Date: Thu, 06 Nov 2008 12:43:50 -0500
To: Xiaoming Fu <fu@cs.uni-goettingen.de>, Hannes Tschofenig <Hannes.Tschofenig@gmx.net>
From: Al Morton <acmorton@att.com>
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References: <00ff01c93c55$b62dee80$04ffa8c0@nsnintra.net> <490D0132.1000709@cs.uni-goettingen.de>
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Subject: Re: [NSIS] QSPEC Questions
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At 09:24 PM 11/1/2008, Xiaoming Fu wrote:
>Hannes Tschofenig wrote:
>...
>>* Where does the description for <Path Jitter>, <Path PLR> and <Path PER>
>>come from? There is no reference to another RFC given in these sections.
>
>QSPEC ID suggested packet jitter is based on [rfc3393], but I am not 
>sure whether (nominal) jitter values are directly addable across multiple hops.

It's possible to accumulate Jitter values, if they're measured
and specified in the appropriate form.
The more detailed references include Rec Y.1541,
http://tools.ietf.org/html/draft-ietf-ippm-spatial-composition-07
http://tools.ietf.org/html/draft-ietf-ippm-delay-var-as-01
>Also, is PLR or PER directly addable (or just a multiplication)?

see the first two refs above.
Al

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