Hi in Towcester we just had BT Infinity come to town. Had installed the 80/20 service only to find I could only get 40/7 - everything tested and a fault was found. So engineer out - checked the line, line ok but yep getting reduced service. Checked the cabient which is 800m away, yep that was getting 80/20. Put a 700m dumb line on it and yep it reduced by half. So they changed the port in the cabient and re-did my profile. Then back to my house and still half what I should be getting. The engineer tested the copper all good!. Sounds like the cabient is not able to cope with the load. We agreed there is no way we should be loosing 40/13 on a perfectly good 800m line.
Apparently he is going to leave the fault open but hey Im kinda concerned here. Towcester was proud enough to be one of these rural projects for superfastbroadband. I am suspecting its the cabient here anyone from BT shed some light here?
legitimise_sailing is correct - you are getting a very good service on a 800m line if you're achieving 40Mbps. At the moment the expected maximum is somewhere around 35Mbps at 500m.
When Profile 30a is is employed on FTTC connections (I believe only Profile 17a is used on Infinity at the moment) you coould be able to achieve around 80Mbps on your line.
I am stumped that the engineer thought he could get 80/20 on a line that long, he wasn't from the Indian call centre by any chance?
See graph for distance and speed. This with ideal lines so expect a bit less. Infinity is VDSL2