[38140] in North American Network Operators' Group
RE: QOS or more bandwidth
daemon@ATHENA.MIT.EDU (Sean M. Doran)
Tue May 29 13:00:39 2001
To: nanog@merit.edu, pete@kruckenberg.com
Message-Id: <20010529165749.37F1AC7904@cesium.clock.org>
Date: Tue, 29 May 2001 09:57:49 -0700 (PDT)
From: smd@clock.org (Sean M. Doran)
Errors-To: owner-nanog-outgoing@merit.edu
Pete Kruckenberg <pete@kruckenberg.com> writes:
| The VoIP QoS problem is interesting. Barring congestion in
| the network, VoIP just has a problem with the fact that IP
| communications are frame-oriented (and a VoIP packet gets
| behind a 1536-byte Ethernet frame in the transmit queue).
You *really* want to study Peter Lothberg's excellent
queue graphs in his presentation to the Phoenix NANOG a few
days ago. They will probably find themselves on the
NANOG web site soon, if they are not there already.
Speaking of Peter, I often get calls from him which start
off with, "you know, Voice Over IP doesn't work without
ATM, RSVP, QoS, LAN emulation, MPLS, traffic engineering,
and fancy queueing!". It's how I know it's him, when
he's making a VOIP call through MAE-EAST, since the connection
is much too _clear_ to tell by listening alone.
I hope that helps answer your question about what technologies
are needed to improve VOIP sound quality, rather than the interesting
ones about directories.
Sean.
