Seriously. Unless you can guarantee you won't be on interleave you are not going to be happy. You might be lucky depending on your line quality. But the dreaded DLM (dynamic line management) on the FTCC cabinets could put you on high pings and there is very little you can do about it. The ISP has no control over DLM as it requires a BT engineer to go out and reset it. But if the line quality is still not good the DLM will just turn interleave on again.
BT Wholesale in their infinite wisdom decided a stable connection is preferred to one that has the odd disconnection and thus will put interleaving on whenever it detects too much noise on the line or too many disconnections. They also decided that instead of ISP's having access to DLM control it would be managed by their kit at the cabinet. Seriously annoying.
EDIT: One other thing. As more and more people get connected to your cabinet then crosstalk from other lines causes interference, not just bandwidth congestion and thus causes the speed to drop and ping times to rise due to interleave. Some users report having initial low pings to extremely high pings after a few months as the cabinets become more congested. Some as high as 150ms!
65/18Mbps on Plusnet unlimited
Edited by Oddball (Tue 16-Jul-13 15:47:52)