On 20 Apr 2012, at 13:32, Michael Welzl wrote:
On Apr 20, 2012, at 2:23 PM, Jim Gettys wrote:
On 04/20/2012 07:55 AM, Mirja Kuehlewind wrote:
Hi Randell,
I didn't follow the whole discussion but regarding LEDBAT we have a TARGET delay of max. 100ms. That means you can choose a smaller one. We've chosen 100ms as a max as there is an ITU recommendation that 150 ms delay is acceptable for most user voice applications and we wanted for sure stay below that.
100 ms + 75ms speed of light delay across the US (or equivalent across Europe, for example) + 100ms at the receiving end....
Of course, it's even worse between continents, even without broken networks.
Not so nice....
Not argueing about your point here (I agree that we have to fix the edge), but: LEDBAT is an end-to-end mechanism, so I think that the 100ms reflect the total measured end-to-end delay.
I think LEDBAT's target is the relative delay (i.e. from queues) - It's not clear how it would measure the total end-to-end delay. Piers.
Cheers, Michael
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