Re: Shared Service (Party Line) emulation
Long after party lines there were (may be still are) other "earth start" lines, and when I encountered them they were a nuisance to test, they needed a PABX that supported that line type, and I never really understood why they were there.
I don't think meter pulses were involved (another service that required a local earth connexion), but I suppose historically it might have been a factor.
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Graham.
G3ZVT
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