Dear Ingemar, > I recall that the RTT for satellite links is ~560ms, I would expect that > Wimax has a shorter RTT. I am not sure about this - but I do remember from a presentation I attended (by BT), that tests showed that Wimax had similar or even longer RTTs than satellite links.. > Do you have any indication (rule of thumb wise) at what levels of RTT it > may be necessaryy to send more than one feedback / RTT ? I would be interested in knowing this from Emmanuel. Regards Arjuna