On 10/26/2018 03:49 PM, Josef Fortier wrote:
It's fair to note that POTs lines are also technically 2 pair... but only one pair was used (their was a push in the 70's to wire up the second line for teens).
Don't confuse cable pairs with how many pairs are required for a phone. An analog phone line is one pair. Phone cables run from 1 pair up to hundreds. The typical drop wire, running from the pole to a home is one pair and inside would likely connect to a two (old) or three (new) pair cable, with each pair able to carry a phone line.
That said, T1's also historically required a regenerator/repeater every 1000 feet. This is a bigger consideration then the copper in my mind.
Actually over 6000'. Read the T1 article I sent earlier. A repeater (often seen as a large can on the side of a telephone pole) would typically handle several circuits, with 1 repeater card for each pair. There was fairly high voltage (+-130V IIRC) to power the cards, with the power passing through each card and onto the next down the line. There would often be a spare circuit and a switch to automagically switch a failed circuit to the spare. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org