Subject: Re: [AVT] Comments on draft-ietf-avt-rtcp-report-extns-03.txt

From: "Alan Clark" <[email-masked]>
Date: Wed, 12 Mar 2003 10:14:57 -0500

Proposed updated wording for Section 4.7.7

4.7.7 Jitter Buffer Parameters

   jitter buffer nominal delay in 5mS increments (JB nominal): 8 bits
      This is the current nominal delay through the jitter buffer which
      corresponds to the additional delay for packets that arrive on-time.  
      This parameter MUST be provided for both fixed and adaptive jitter
      buffer implementations.

   jitter buffer maximum delay in 5mS increments (JB Maximum): 8 bits
      This is the current maximum jitter buffer delay corresponding
      to the earliest......

   jitter buffer absolute maximum delay in 5mS increments (JB abs max): 8 bits
      This is the absolute maximum delay that an adaptive jitter buffer
      can reach under..........

Regards

Alan Clark
Telchemy  

---------- Original Message ----------------------------------
From: Magnus Westerlund <[email-masked]>
Date:  Wed, 12 Mar 2003 14:52:11 +0100

>Hi Alan,
>
>Alan Clark wrote:
>
>>>18. Section 4.7.7: How does one use the jitter buffer sizes when one has a sample based codec and have no defined frame size, or for that matter if the frame size is variable? 
>>>    
>>>
>>
>>The goal of these metrics is to indicate the mean and max delays due to the jitter buffer and also provide a means of determining if the cause of excessive discards is an incorrectly configured jitter buffer.  This can be achieved by specifying the jitter buffer characteristics in terms of milliseconds rather than packets or frames.  If we took this approach then would it be sufficient to have the mean/max jitter buffer delay range from 0 to "255 or greater" mS?
>>  
>>
>
>I would say no. Why not define it as 5 or 10 ms. This would give more 
>substantial range.
>
>Cheers
>
>Magnus Westerlund 
>
>Multimedia Technologies, Ericsson Research ERA/TVA/A
>----------------------------------------------------------------------
>Ericsson AB                | Phone +46 8 4048287
>Torshamsgatan 23           | Fax   +46 8 7575550
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>
>
>
>
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