[djfunkdup]

unlike DSL cable is not really tweakable..

jitter is something that is common on a cable connection..downstream/upstream power levels can be adjusted if they are out of sync from the normal parameters but tbh they can cause drop outs rather than jitter if they are too high or too low.

high utilization on your local UBR can sometimes be the cause of high and variable jitter.

edit: jitter is something that CAN be common on cable..but not always..sorry i was distracted doing something there//

---------- Post added at 14:26 ---------- Previous post was at 14:10 ----------

now something else i should have said.:

i take it you are using the superhub that VM supplied..

if you access the hub: go to services and disable

Firewall Features
Port Scan Detection
IP Flood Detection

having IP Flood detection enabled can cause high latency and problems with jitter

hope this helps.i am sure others will be along to give you more information and to correct anything that i have got wrong