On Mon, 24 Oct 2011, John Leslie wrote:
150 milliseconds is a real challenge to accomplish worldwide, though
it's quite achievable within one continent. I expect IETF folks could
learn to work with 250 milliseconds.
Are these numbers RTT or one-way? According to figures I've seen in other
contexts, most people are fine with 400ms RTT (this is a quite common
delay just talking mobile phone-to-phone even in the same city), but
people really start to notice around 500-700ms RTT. 1 second RTT is really
noticable, but still workable with some practice.
It's hard to have a heated argument over more than 400-500 ms RTT though,
so it depends on what kind of discussions are to be had :P
Ground/sea based fiber optical cable networks rarely give more than 500ms
RTT, so anyone fairly well connected to the worldwide Internet via ground
based infrastructure should be able to participate with less than 1s RTT
including encoding delays etc, at least if the system is located at the
same place or fairly close to the venue (at least so the signal doesn't
have to be bounced half way around the world before it's sent to the final
destination).
--
Mikael Abrahamsson email: swmike(_at_)swm(_dot_)pp(_dot_)se
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