I also got this from a tech on the VM newsgroups
Hi Dave,
Everything on the network checks out at the moment. The power level is fine, it can be as low as -10 or -12 and the connection will not deteriorate. Would you perform 2 simultaneous downloads from
http://gamefiles.virginmedia.com/blueyondergames/ and report back the speeds to us. Does the downstream power level fluctuate at all?
For your information the speeds I got was 177KB\sec, 166, 153, 177, 188,, 183, now 154kbs. It changed every second !!
The config on my modem is, so it is setup for 20MB
Cable Modem Operation Configuration
Network Access : Allowed
Maximum Downstream Data Rate : 20480000
Maximum Upstream Data Rate : 768000
Maximum Upstream Channel Burst : 1600
Maximum Number of CPEs : 1
Modem Capability : Concatenation Enabled, Fragametation Enabled, PHS Disabled