After a continued improvement up to 8.7 upload for a couple of weeks now (all speeds quoted from Which magazine tester) the speed dropped overnight to 4.7, then during this morning 27th July 2019 it dropped further to 1.0 (i.e. 12% of the "normal" upload speed) Download was around the same as before 38 to 39.
Looked at my separate router Synology 2600ac logs there was a reset in the very early morning, this is apparently normal for Dynamic Line Management (DLM) done overnight (ish) to avoid disruption to users)
With upload at 1.0 I made a soft reset on the Billion modem, upload speed (attainable rate) initially back to 8800 but after a minute or two stats screen went blank and Status went from "Up" to "Initialising" (assume the exchange did this automatically) upload speed then dropped to 2800 ish and SNR margin....
from Down 6.4 dB Up 6.0 dB
to Down 6.5 dB Up 9.2 dB
Speeds now sitting at 39 and 2.7 (Which figures again)
Connection is still filter direct in test socket under face plate where it has been since the start of this post . As before there are no other connections to the phone line (which would be disconnected anyway with the face plate off)
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All other things e.g. anything that could cause interference either completely removed or at least moved away so this remains the same since this post started. Day to day the upload has moved from a steady 8.4 to 8.7.
A quiet line test (Call 17070 and use a WIRED phone) albeit through the filter and with broadband connected {didn't want yet another reset to upset DLM} was no noise at all. Should this test be made direct to the socket under the face plate?
Yet another factor, the line which has been bad for at least twenty five years (everything from telegraph pole to my home phone replaced during this time) was last found to be faulty when an Openreach guy was in the manhole next to the telegraph pole and suddenly our phone went crackly yet again. Reported this and the fix, moving to a different twisted pair (original phone lines have been in since 1940) seemed to have at last fixed this for good.
It has been very dry here for a couple of weeks (during which the upload speed has remained constant from day to day) but last night it started raining about 2200 Friday and is still raining now at 1348 Saturday, maybe these old underground lines from the pole outside to the green box nearly half a mile away get wet?
I cancelled the last Openreach visit as the line had been fine for days and I put the reduce in upload speed down to interference from something at home. It had reset from 0.9 to 8.4 and stayed there and I didn't want to incur a charge for something at home having caused the problem.
Other than waiting for a few dry days and then resetting the modem to see if the speed increases and holds I'm at a loss as to what to do next.
PS. The comprehensive stats attached to my last support ticket by PN suggested noise was the problem. Can the ISP detect noise on the house side of the master socket ?
