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Re: Questions about BT landlines.
The twisted pair also has a chracteristic impedence, IIRC for telephony this is 600 Ohms. The BT cable usually has two twisted pairs in the run to the property so there's a spare pair if needed.
Older cables were figure of eight single pair and prior to that two individual bare wires from the pole in the street to a pair of insulators on a bracket on the property wall.
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History is much like an endless waltz: The three beats of war, peace and revolution continue on forever.
However history will change with my coronation - Mariemaia Khushrenada
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