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Re: [AVT] CCM draft review -- should "bandwidth" include the headeroverhead

Wesley Eddy <weddy@grc.nasa.gov> Tue, 09 January 2007 01:11 UTC

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Date: Mon, 08 Jan 2007 13:09:21 -0500
From: Wesley Eddy <weddy@grc.nasa.gov>
To: Stephan Wenger <stewe@stewe.org>
Subject: Re: [AVT] CCM draft review -- should "bandwidth" include the headeroverhead
Message-ID: <20070108180921.GC30296@grc.nasa.gov>
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Cc: Randell Jesup <rjesup@wgate.com>, avt@ietf.org, Lloyd Wood <L.Wood@surrey.ac.uk>
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On Mon, Jan 08, 2007 at 07:57:43PM +0200, Stephan Wenger wrote:
> 
> On Jan 8, 2007, at 7:39 PM, Lloyd Wood wrote:
> 
> >]...]
> >
> >Bandwidth is measured in Hz. This isn't that, and accounting for  
> >all layers and overheads (FEC/coding, etc) is impossible.
> >
> >"RTP payload receiver link capacity" would be more like it.
> >
> >Don't use "bandwidth".
> >
> 
> I disagree with the last statement.  Bandwidth is commonly used  
> nowadays for as a synonym for bitrate or whatever.  9 out of 10 of  
> the first hits for the term bandwidth refer to something that has to  
> do with the number of bits to go from a to b.  Wikipedia also  
> mentions bandwidth in the context of web hosting connectivity.
> 
> Link capacity is something very different.  It refers to the "link",  
> which sounds like "link layer", which disregards the shared nature of  
> IP link access.
 

IPPM has tried to put some precise definitions in place for other WGs
to use (maybe they'd be helpful here):
http://www.ietf.org/internet-drafts/draft-ietf-ippm-bw-capacity-04.txt


-- 
Wesley M. Eddy
Verizon Federal Network Systems

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