[AusNOG] Why not Symmetric ingress and egress?

[Mark Smith]

On Fri, 18 Jun 2010 06:54:28 +0800
"Michael Christie (micchris)" <micchris at cisco.com> wrote:

> "There'll never be a reason in a video delivery system for a high
> bandwidth backchannel - "
> 
> Unless of course the video is bi-directional. > Skype, HD video conf,
> tele-medicine, collaborative education...
> 

That sounds like the {Internet|NBN} to me. Do people remember what the
original question was?

> Mike.
> 
> -----Original Message-----
> From: ausnog-bounces at lists.ausnog.net
> [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Mark Smith
> Sent: Friday, June 18, 2010 8:40 AM
> To: Paul Brooks
> Cc: ausnog at lists.ausnog.net
> Subject: Re: [AusNOG] Why not Symmetric ingress and egress?
> 
> Just quickly,
> 
> On Thu, 17 Jun 2010 22:02:21 +1000
> Paul Brooks <pbrooks-ausnog at layer10.com.au> wrote:
> 
> > On 17/06/2010 8:09 PM, Mark Smith wrote:
> > >
> > > My guess is that ADSL was chosen as the broadband technology to use,
> > > rather than a symmetrical DSL technology (not in Australia, I'm
> > > talking by the broadband groups who standardise it i.e. the Annex M
> > > people), because it sounded right for the way people were using the
> > > Internet at the time (consumers rather than producers), rather than
> > > understanding that the Internet protocols have operated over
> symmetric
> > > links for most of their life and it is therefore an unstated design
> > > assumption. If that wasn't the case, I don't think the above RFC
> would
> > > exist and be a Best Current Practice RFC.
> > >    
> > Nice try Mark, but your guess would be wrong!. ADSL was developed as a
> 
> > technology for video delivery
>                  ^^^^^^^^^^^^^^
> 
> Exactly - a purely asymmetric traffic profile. There'll never be a
> reason in a video delivery system for a high bandwidth backchannel -
> because it is only for video signalling and nothing else.
> 
> 
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