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Re: last mile prioritization (was Re: Enterprise VoIP Peering Point? )
Alex Bligh wrote:
--On 11 August 2004 20:00 +0000 Paul Vixie <firstname.lastname@example.org> wrote:
On the topic of congestion and the questioned need for
Jasleen Kaur's group at UNC-CH is studying the presence of
the Internet. It turns out to be non-trivial to find it.
indeed. endusers who can't run their MMORPG's have already taught their
dsl and cablemodem providers to maintain enough headroom to their peers;
enterprise and datacenter customers are now receiving competitive SLA's
from their transit providers. bankrupt fiber/wavelength assets are
sold/leased at a fraction of their construction costs. datacenters are
almost invariably carrier-neutral now, just to stay in business. we are
just not living in a congestion-in-the-middle world any more, and the
trend looks pretty good.
Is that true on (say) US<->Asia routes these days? Or
I say that, as it seems to me there's a pretty good correlation between
poor availability of fiber and regulatory arbitrage that makes it
POTS to VoIP substitution viable. I don't know if the lack of fiber
availability is sufficient to cause congestion a-la 95/96/97, but I've
had some traceroutes into india and south africa which suggest it might
I don't think it's true in Oregon, let alone across the pond. A couple
weeks ago I tested H.323 video with a DSL user on the coast who has
symetric 256k and the voice was unsusable due to jitter. My end at work
is fine. Same result over multiple calls while ensuring all the ports
were open, firewalls downed temporarily, etc. Turns out his phone
company sends all the packets to Denver then back through Seattle to get
to me in Portland. When queried, my friend was informed that the links
were all lightly loaded, less than 29% so the problem wasn't theirs. I'd
argue that 29% is probably much too high for sensitive traffic - but
what is the standard btw? He's upgraded now to a half meg each way and
we'll do some more testing.
As for last mile problems, here in Portland at home I use a very large
cable company's broadband service and I gave up on Vonage because the
cable basically saturated every morning between 10:00 and noon - echos,
connection down/unavailable, you name it. Also, my ATA was between my
cable modem and router so the advertised prioritization scheme should
have worked. I was pretty disappointed to return the Vonage ATA within
the two week trial period. Vonage itself seems like a great company. I
hope to try again if the cable service becomes more reliable.
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