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RE: [dccp] Re: [AVT] Would DCCP kill Internet real-time media dis tribution?

"Phelan, Tom" <tphelan@sonusnet.com> Thu, 04 December 2003 16:30 UTC

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From: "Phelan, Tom" <tphelan@sonusnet.com>
To: 'Henning Schulzrinne' <hgs@cs.columbia.edu>
Cc: avt@ietf.org
Subject: RE: [dccp] Re: [AVT] Would DCCP kill Internet real-time media dis tribution?
Date: Thu, 04 Dec 2003 11:28:46 -0500
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Hi Henning,

> I believe that there now is a suggested initial TCP windows 
> size > 1. Is 
> this correct? (If you figure a maximum acceptable network 
> delay of 100 
> ms and a typical audio/video packet spacing of 50 ms, you would be 
> sending about 4 packets per RTT.)

The current CCID3 draft (TFRC for DCCP) says the initial rate is 4 packets
per RTT.  This should pretty much eliminate slow start for speech audio.

Your points about the value of silence suppression for non-multicast
conferencing seem bang on target.  I'll remember to keep that in mind.

Tom Phelan

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