Quote:
Originally posted by MadDogMe
It's a bus as in Front Side Bus, it's a main artirial highway for electricity to run down, normal multicore wire would glow white hot or just melt explosivly!  . I did'nt know telephone exchanges used it though?...
That probably is solder, though I could'nt imagine trusting that kinda current to a soldered connection!, bolt holes only please!...
PS, the discolouring is just tarnish/oxidisation...
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before the new digital system x exchanges they had mechanical exchanges that required lots and lots of power.