Jez said:See my edit above, basically if your line got max enabled, with only 12db to play with you arnt going to be able to sync an awfully lot higher, as i said earlier mine was 22db at a 1152 sync, this dropped off to 4-5db by the time i got as high as 3.6-3.7mbit. 4 is just doable at 2db, but as your margin will fluctuate throughout the day as noise occurs, it just falls too low and cuts off all the time.
Ahh quick editing, I think I follow you.

At least I hope that makes sense!

Thanks again!!!!!