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Originally Posted by SuperCow
Thanks for your answer Jon. I did think the ACK packets would reduce the effectiveness of simulateneous download/upload but not as much as this.
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No, me either. Bare in mind ack frames are tiny in comparison to data frames and the queuing of the upstream data should not really impact the ack frames that much. I supposed you'd need to sniff it to get a clearer picture but it doesn't bother me that much so....
Another possible explanation is that as far as I can tell, the NTL connection seems to be CSMA/CD half-duplex type which means data collisions will occur. Contrary to popular belief 10Mb is a theoretical throughput and in practice in a contended environment the maximum you will see is about 3-4mbits.