[53570] in North American Network Operators' Group
Re: PAIX
daemon@ATHENA.MIT.EDU (David Diaz)
Mon Nov 18 13:51:55 2002
In-Reply-To: <sdd8bd5f.003@gwsmtp.ohsu.edu>
Date: Mon, 18 Nov 2002 13:48:32 -0500
To: "Jere Retzer" <retzerj@ohsu.edu>, <nanog@merit.edu>
From: David Diaz <techlist@smoton.net>
Errors-To: owner-nanog-outgoing@merit.edu
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Well... remember it's speed of light THROUGH fiber which isnt the
same, its actually a bit slower then "c"
Coast to coast you should see 35 - 65ms depending on the route.
We've all had this thread about router overhead. If there is a
congestions point in the middle with buffering and traffic level
priorities running, then you are right. Otherwise I dont think you
should see 150-180ms.
In the real world however, yes, off several dsl links Im seeing those
levels to various sites, I think it's more a factor of congested
peering links or traffic aggregation at a hub. People arent spending
the money to upgrade links right now.
At 10:13 -0800 11/18/02, Jere Retzer wrote:
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Stephen Sprunk wrote:
>>>Any point in the US is within 25ms RTT (or less) of a major
>>>exchange; eliminating this 25ms of latency will have no effect on
>>>VoIP unless you're already near the 250ms RTT limit for other
>>>reasons.<<<
25 MS is assuming that the only delay is due to the speed of light.
Add equipment, especially routers or other gear that requires
manipulating packets and the delays add up quickly. I once read that
the most people wil tolerate on a regular basis is around 150-180 ms.
I think that is much too high for regular use
--
David Diaz
dave@smoton.net [Email]
pagedave@smoton.net [Pager]
Smotons (Smart Photons) trump dumb photons
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<div>Well... remember it's speed of light THROUGH fiber which isnt the
same, its actually a bit slower then "c"</div>
<div><br></div>
<div>Coast to coast you should see 35 - 65ms depending on the
route.</div>
<div><br></div>
<div>We've all had this thread about router overhead. If there
is a congestions point in the middle with buffering and traffic level
priorities running, then you are right. Otherwise I dont think
you should see 150-180ms. </div>
<div><br></div>
<div>In the real world however, yes, off several dsl links Im seeing
those levels to various sites, I think it's more a factor of congested
peering links or traffic aggregation at a hub. People arent
spending the money to upgrade links right now.</div>
<div><br></div>
<div><br></div>
<div><br></div>
<div>At 10:13 -0800 11/18/02, Jere Retzer wrote:</div>
<div>Content-Type: text/html<br>
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</div>
<div><br>
<br>
Stephen Sprunk wrote:</div>
<div><br>
>>>Any point in the US is within 25ms RTT (or less) of a
major exchange; eliminating this 25ms of latency will have no effect
on VoIP unless you're already near the 250ms RTT limit for other
reasons.<<<<br>
</div>
<div> </div>
<div>25 MS is assuming that the only delay is due to the speed of
light. Add equipment, especially routers or other gear that requires
manipulating packets and the delays add up quickly. I once read that
the most people wil tolerate on a regular basis is around 150-180 ms.
I think that is much too high for regular use</div>
<div><br></div>
<div><br></div>
<x-sigsep><pre>--
</pre></x-sigsep>
<div><br>
David Diaz<br>
dave@smoton.net [Email]<br>
pagedave@smoton.net [Pager]<br>
Smotons (Smart Photons) trump dumb photons<br>
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