Please see my reply above regarding 'backfeeding'. If there was any evidence of detriment, a seperate cable would definitely resolve the isuue. However, it appears there was no change in circs on your installation ?? Did the engineer verify that there was a high error count due to the 'backfeed', before carrying out the work
Alas, I don't have FTTC and won't until 2015, from when I last bothered to look.
When FTTC was installed, I achieved higher speeds & my connection appeared stable for around 1 month, so I would personally rule out the backfeeding as an issue.
It all fell apart following the complete loss of telephone & FTTC services for 4 days back in July (due to an "issue" unrelated to my connection).
Since then, numerous engineers have visited. Some of them just swapped the OR modem & some did some "work".
The engineer who replaced the drop cable round the back of the house & thus removed the backfed shielded cable did not (to my knowledge) run any error tests. He just decided it would be better to not back feed.
As by then I could access my own stats, it was my own report to Plusnet that I was regularly seeing CRC errors in the millions within a 2 minute period, along with massive SNRM drops whenever a telephone hand set was lifted that prompted that visit.
There was indeed a very slight improvement, but my original speeds & stability have still not returned.
Apparently BT tests run by Plusnet now report:-
"Your current RDSLAM profile is:
"16.2M-32.4M Downstream, Interleaving Low - 3.6M-7.2M Upstream, Interleaving Off"
As previously discussed this assigned dynamically by the DLM system. Unfortunately as we do not see any details data from the DLM system I cannot investigate as to why the profile has changed at any point." I did originally have a RDSLAM profile of 20M-40M Downstream.
As my connection is now apparently within "acceptable" limits, Plusnet have informed me I will be charged £60 for another engineer's visit if no faults were found during testing.
I believe we have already confirmed that "certain" tests such as PQT & Eclipse etc. would indicate LTOK.
I did ask what sort of tests I could expect for my £60, but as yet I have not received a reply.
I am only a simple end user, but I would suggest the new CIDT test that is over 90% successful in determining HR issues, or at the very least a full TDR test.
I cannot obtain a straight answer when I query if my connection is speed-capped by BT (for whatever reason) & I am still unable to obtain confirmation that it has ever actually been reset by BT to a 40Mb sync speed following various engineering works.
I still don't know if there is a HR issue & have tried to bid for 'Mole' 301C & even a 'Hawk' tester on ebay so that I could run my own "unofficial" tests.
One engineer did remove a double-jumpered cable in the cabinet after seeing faults via his 'Hawk' TDR tester.
However, as he point-blank refused to retest the D-side after his work in the cabinet, I/we are not sure whether or not that was actually causing the issue.
The very same afternoon I ended up with a crackly phone line again, needing a PSTN engineer's visit.
We discussed HR & potentially high attenuation issues (although he did describe them as high "insinuation" issues) & went off to organise something at the MDF/MFD??? at the exchange.
As I couldn't access my stats when my connection was much "better" I have nothing to compare against & Plusnet have confirmed the original installing engineer's notes (supposed overwritten at one point) didn't report them.
The attachment shows just a glimpse of my "messy" connection from early November.
I am not allowed to speak directly to BT & Plusnet refuse to contact them on my behalf, so I am not really sure what, if anything, I can do about matters other than grin & bear it.
I did spot a couple of guys digging at the pole that my connection is served from last weekend, along with a thick looking underground cable being dragged through.
I got all excited that maybe, just maybe, someone has identified the problem & is attempting to fix it once & for all.
However, the cable has been dragged from the side further away from the cabinet.
Anyway, after hijacking someone else's thread, I had better keep quiet for a bit, or add some more to the previous epic thread that I started back in August.
Paul.
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