Update 26/05/2012:Nobody contacted me from Plusnet, either yesterday afternoon or this morning to confirm whether an engineer had been arranged for today or not.
I was therefore slightly surprised that an engineer (Liam) contacted me this afternoon confirming he was on his way.
Anyway, Liam hadn't been provided any background detals so on his arrival, I outlined the various issues, tests & repair works carried out to date.
Even though the filtered VDSL2 Service Specific FacePlate was only replaced in April, I had very recently retested my connection again with a telephone & the HG612 modem plugged into a dangly filter which was plugged into the master socket's test socket (filtered SSFP completely removed).
Left overnight, SNRM levels remained very stable, as did Output Power levels & various error counts were very low.
More importantly, I was again able to use the phone during the currently hot weather without it causing the connection to drop.
Liam firstly replaced the SSFP, mentioning that he had replaced quite a few as they are apparently prone to failing.
Quite often these faulty SSFPs cause a direct short circuit, completely disabling telephone & FTTC services.
After discussing the problem from February when engineers not working on my connection had caused disconnections while working at the top of the pole where my DP is located, Liam decided to check the connection/cabling at the DP itself.
A new undergound cable was installed from the nearby joint chamber to another DP on the same pole in February when those engineers were unable to provide any further services from the existing DPs.
Liam stated that if today's works didn't fix things, he would consider connecting me to this new UG cable (around 40m in total length). If necessary, that would have to be at another time though as he wasn't allowed to access joint chambers on his own.
While Liam was at the top of the pole, but before starting work, I noticed a brief disconnection of no longer than maybe 30 seconds or so duration.
My modem log has subsequently confirmed it as 27 seconds.
Liam spent a while at the top of the pole checking things & a longer disconnection was noticed.
On returning, Liam confirmed he had only intentionally disconnected once & the fact that when he did disconnect, the end of the old underground feed cable simply snapped off.
He stripped it right back & remade the connection to the DP (screwed not push fit).
That explained the 27 second unintentional disconnection and the unintended disconnections caused by the other engineers back in February.
According to Liam, that DP connection must have been only just serviceable for a long time.
On completion of his repair work Liam requested a DLM reset as my connection had been stuck at a maximum sync speed of of only 19999k for a few days.
This is tonight's result of this afternoon's DLM reset which seems to be holding its own (so far):-
Error counts are starting to build, but at a much slower rate than of late & they are no longer occuring in massive bursts of thousands/millions of errors within a one minute data sampling period.
All the internal extension wiring was reconnected & I am again able to use the telephone with only small drops in SNRM (0.3db) & without it causing a disconnection.
All in all, today's visit appears to have been successful.
However, this has also appeared to be the case from previous visits, unfortunately only lasting for a few days at a time.