I've taken a look at all the data contained in the "Z files". To be honest, they do not tell me much.
Having read your description of the - <cough> - very messy internal wiring, I am surprised that the Hlog plot is as clean as it is. Even the QLN plot is not too bad. A quiet line test (17070) now needs to be performed from a wired telephone plugged into the test socket. If the hiss like noise is then absent, then that noise has its origin with the internal wiring.
Other than that I am at a loss as to what to recommend. Perhaps another member would be prepared to comment?
Thanks
The stats being uninformative, was there anything we omitted that would have helped?
A small point. As the first test did use an analogue phone was used, which I presume would have been wired, how does a second test with no noise prove internal wiring problems? I'm asking to learn.
TBH, being the rocking horse I am, it's not easy communicating over 100 miles, as the chance of "send three and fourpence...
" is likely. I'm in SW Hants, he near Maidstone.
I have thought of telling him to consider what cabling he really needs, then re-run it all with new.
Yes, any one else, please join in!