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Authored by: Anonymous on Monday, February 04 2013 @ 12:34 PM EST |
I think Wol meant was local distance. In the UK a balanced line was (I think) 50
ohms (and I think 60 ohms on the North American continent). The copper wire
gauge (and thus resistance) meant that good low noise voice telephony (without
relay amplification) was limited to 30 miles from one telephone to to another
telephone. Telephoning 30 miles plus 30 mile was not a trunk call. Beyond that
it was. So that's the same thing as Wol was saying and although London is a
very big city one could dial the next neighbouring London exchange and it was
still local. Oddly, someone might call from hundreds of miles away (say
Edinburgh, which is not in England) and sound as clear as a bell -as if phoning
from next door. As a kid, that puzzled me. [ Reply to This | Parent | # ]
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