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Old 26th Mar 2018, 8:59 am   #10
russell_w_b
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Join Date: Jul 2007
Location: Penrith, Cumbria, UK.
Posts: 3,687
Default Re: Calling the old BT technicians...

Sounds like the line is intermittently O/C to me. Perhaps related to conditions set up as queried in post #5? Of course, you would never know until the line was in use. Why not hang a spare analogue multimeter across it in a place where you can see it, or knock up a little hi-Z LED indicator to monitor the 48V d.c.?
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