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Feb 28th, 2009 at 9:34am
Hi Nigel,
Few questions.
1. What is the CIR configured for the modem?
2. Is the CIR over contended by the operator?
3. What traffic are you passing? TCP, UDP, HTTP, iperf or another test tool?
It all depends on the traffic in use, as to the results you will see, the rates promised are in a best case scenario (as with every equipment provider world wide, except iDirect can typically deliver when we test them) and I have seen them being reached, especially with the higher end modems such as you have.
With defined long packet lengths running UDP traffic (I know it's normally small UDP packets) but long packet UDP will show you much higher data rates, if you are testing TCP, there is a limitation to the bandwidth you will get with a single session, so open multiple sessions to test TCP, you will see the modem pass much more traffic.
finally, the modem is capable of these high rates for sure, but remember you have an aggregate throughput, so your total rate (downstream and Upstream) will not be the two capabilities added together but a lower number. I think you have an Aggregate throughput of 11Msps, 22 Mbps, so not the full throughput that can be achieved down and up combined.
The remotes also have a packets per secon limitation, the PPS limitation may be reached well before the bandwidth limitation, so check the pps through the remote.
To give you a full idea of what's going on, I'd need a little more info, but I hope this gives you a start point.
Scout
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