Shame - that suggests you should be getting well over 40 on 17a, or at least bang-on 40 on capped.
DLM was reset during a fairly recent engineer's visit (9th March). Sync speed was 35322 k for a short while before starting the usual downward journey.
That's odd - going from 8c to 17a should have made a significant difference.
I thought SRA was in place, hence "on the fly" resyncs that are so quick (16 seconds or so) that they do NOT initiate a new PPP session & therefore do NOT update the BT IP Profile/BRAS Rate.
Well, that depends what router you use - I've set mine to a custom PPP timeout of 60 seconds so I can manage a full modem reboot and still not initiate a new PPP session (primarily to keep my IP address for the TBB monitor).
A 16-second resync isn't SRA - with SRA in place, it doesn't go down to resync at all. It just seamlessly reduces your rate from one second to the next, hence the name. Course, that would totally break BTw's IP profiling system which is only why the rare LLU provider on ADSL2+ has tried it.
Yep, I have looked into that.
However, as spare pairs are available in the existing D-Side bundle, they would simply use those.
I have already had the D-Side pairs swapped in an effort to eliminate a single faulty pair.
My belief is that dodgy joints/connections are the root cause of my issues, perhaps only being noticed as my connection speed NEVER reaches the maximum for the capped 40Mb service, therfore my connection is already in a "delicate" condition.
It appears I may be the very last house on my STD code & have the option of a new line from a different exchange.
However, the closest fibre cab from that exchange is over 2km from my home!!!!!!
Shame then. As mentioned I'd expect if you were getting 35mbps on profile 8c then you should be hitting the 40mbps cap all the time on 17a. Have you got a full modem stats pic somewhere I can see?
Only other thing I can think of, if BT can't/won't fix your line - get a second line installed to someone else's home, whom you know has a good line, and pipe it over to yours via Ethernet?