[Joxer]

What I meant was that when there is oversubscription then both the upstream and downstream will tend be over subscribed ie the upstream traffic tends to increase with downstream traffic - I wasn't trying to suggest any causality. As to the UBR I was referring to personal anecdotal evidence that slow speeds are often caused by upstream issues at the UBR most often due to poor SNR. Personally I have not seen any of the issues you mention, though as I said this is merely anecdotal and I am not trying to say there are not other possibilities merely expressing an opinnion. I will make a mental note to try to post more clearly in the future.