Is there any future in running the router off a small car accumulator for a day or so? It's 12 volts @ 1 amp. I have some race car batteries that would run it for at least 48 hours, and are light enough to cart about inside the house. If my laptop hadn't got a tired old lump of a battery in it I would turn all power off in the house and run the two whilst I was out just off battery power and see what happened.
I do have another question, but I can't be sure the seeming randomness of all this isn't confusing the issue. I'll put it forward for critique by those who know.
It *SEEMS* that I get a slightly lower noise margin (17 down to 15 dB) when I run the router off my cheap extension cable, about 30 feet long, plugged into the test port of a brand new filtered main ADSL 1.0 "box". It's just draped along the boarded loft and then the carpet in my office. But it seems it's stable connected in this manner. The exact set up is a brand new ADSL 1.0 box from the Italian company that do the one with 2 extra A/B terminals. I can't plug the router extension cable directly into the test socket as it has 2 RG whatever connectors, so I am using a new dongle filter that came with the new router as an adaptor. So ADSL 1.0, dongle filter in test socket, extension cable in small dongle socket, then cable direct to router. Seems good like that. Not seen noise, even over extended periods.
I then try to return to a "normal" hidden wired circuit. I put the original BT twisted pairings cable that runs through the loft space onto the A/B terminals inside the cover of the ADSL 1.0 and the other end of the cable goes straight to a double new socket in my office. I only connect the two blue wires (blue and blue / white) to A/B and at the other end they terminate in my new double socket (phone / router). I plug the router into the router socket with its new short cable. In that format I see noise. It was the same with the old sockets, and I am 110% sure the wires are inserted properly, with the correct tool. As far as I can tell the cabling is now not near any SMPS or anything likely to radiate RF.
So how come the el cheapo extension from router port of master socket, via a filter dongle just used as an adaptor to mate differing plug / socket types, straight to the router is quiet, and the original BT wire is not? I have tested continuity and resistance with the cable pair shorted at one end and it seems perfect. I have trimmed the ends to be sure there are no near breaks inside the insulation near the ends. And how come the el cheapo extension cable shows a slightly lower RX noise margin than the BT wiring?
I am amazed I am still pursuing this, I usually have great impatience with this sort of stuff
I guess I am now very curious as to WHY it isn't working properly.
Thanks for reading!