[ih] Evolution of Internet audio and video

[John Day]

Bell Labs just ain’t what it use to be.

Remember when they discovered that network traffic was self-similar and they were just measuring the artifact of TCP congestion control?

> On Sep 29, 2025, at 22:06, Craig Partridge via Internet-history <internet-history at elists.isoc.org> wrote:
> 
> On Mon, Sep 29, 2025 at 3:59 PM Karl Auerbach <karl at iwl.com> wrote:
> 
>> 
>> All in all the cure for many things was to add delay before rendering
>> content.  But that affected conversational uses where, according to the ITU
>> we have a round trip budget of only about 140 milliseconds before people go
>> into half-duplex/walkie-talkie mode.  I really wanted to get my physicist
>> friends to consider increasing the speed of light, but they were resistant
>> to the idea.
>> 
> Fun story -- I had reason to go through the literature that led to the
> 140ms standard.  Turns out to have been lousy test equipment (I don't
> recall anymore and my published versions of this discovery sanitized the
> stupidity, but I think they turned out to be testing the quality of the
> echo cancellers).  Riesz and Klemmer did the good quality tests in the
> mid-1960s (Bell System Technical Journal) and they determined 600ms
> round-trip was just fine.
> 
> Craig
> 
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