[53583] in North American Network Operators' Group
Re: [Re: PAIX]
daemon@ATHENA.MIT.EDU (Joshua Smith)
Mon Nov 18 16:40:12 2002
Date: Mon, 18 Nov 2002 16:33:01 -0500
From: Joshua Smith <joshua.ej.smith@usa.net>
To: Jared Mauch <jared@puck.Nether.net>,
Jere Retzer <retzerj@ohsu.edu>
Cc: <nanog@merit.edu>
Errors-To: owner-nanog-outgoing@merit.edu
for my voip network/peers, i can withstand rtt's of around 600ms - grante=
d
the quality sucks at that sort of latency, but data/ip routes into some
of the less-than-developed places in the world are crap at best, and any
phone is better than none
Jared Mauch <jared@puck.Nether.net> wrote:
> =
> On Mon, Nov 18, 2002 at 10:13:48AM -0800, Jere Retzer wrote:
> > =
> > =
> > Stephen Sprunk wrote:
> > =
> > >>>Any point in the US is within 25ms RTT (or less) of a major exchan=
ge;
eliminating this 25ms of latency will have no effect on VoIP unless you'r=
e
already near the 250ms RTT limit for other reasons.<<<
> > =
> > =
> > 25 MS is assuming that the only delay is due to the speed of light. A=
dd
equipment, especially routers or other gear that requires manipulating pa=
ckets
and the delays add up quickly. I once read that the most people wil toler=
ate
on a regular basis is around 150-180 ms. I think that is much too high fo=
r
regular use
> =
> True.
> =
> As far as VoIP goes, take 2 (digital/pcs/gsm/whatnot) cell phones
> (preferably on different carriers, or even the same if you want to see =
it)
> and call the other phone. Check out the delay in there. People who
> think that VoIP needs low delay don't realize the [presumably compressi=
on
> and other dsp related] delays introduced that people will be able to
> withstand.
> =
> - jared
> =
> -- =
> Jared Mauch | pgp key available via finger from jared@puck.nether.net
> clue++; | http://puck.nether.net/~jared/ My statements are only m=
ine.
"Walk with me through the Universe,
And along the way see how all of us are Connected.
Feast the eyes of your Soul,
On the Love that abounds.
In all places at once, seemingly endless,
Like your own existence."
- Stephen Hawking -
