North American Network Operators Group
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Re: Fast TCP?

  • From: Marshall Eubanks
  • Date: Thu Jun 05 07:00:46 2003

Hello;

e-VLBI streams can easily sustain packet losses. IMHO these streams should be sent
UDP with application layer congestion control, minimal FEC if necessary and "worse than best effort"
QOS (because VLBI has little money but an almost infinite ability to generate bits). These TCP based tools may be
useful for other applications, but I do not think that they are the right path for e-VLBI.

Regards
Marshall

On Thursday, June 5, 2003, at 02:02 AM, Mans Nilsson wrote:

Subject: RE: Fast TCP? Date: Wed, Jun 04, 2003 at 11:41:22PM -0400 Quoting Deepak Jain ([email protected]):

I am not sure why sending a single large/high speed stream today (>1Gb/s) is
such an improvement over sending multiple today-streams of data, but I guess
that is the difference between a get-it-done-right and a get-it-done-now
mentality.
Because us RE network operators have customers, especially in the
astronomy field, that want to push 1gbit streams in realtime from
various radio telescopes all over Europe. Moreover, they want them
to end up in one place, ie. converge ;-)

So, we need to come up with technolgies that can sustain multi-gbit
(preferably) TCP streams over 50-100 mS RTT links. And, we've got the
OC192 backbones to do it, if TCP were up to it..

--
M�ns Nilsson         Systems Specialist
+46 70 681 7204         KTHNOC
                        MN1334-RIPE

... bleakness ... desolation ... plastic forks ...
<mime-attachment>

T.M. Eubanks
e-mail : [email protected]
http://www.multicasttech.com

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