Thanks patriot It was me and my phone suck most days and is crappy the others.
Calling them servers is not quite right although they are on racks too.
What is in those large building will be large banks of switches that look like this The Phonebooth - Marc's Step-by-Step Telephone Switch.
And on the banks are the switches that have value they look like this File:Crossbar-hy1.jpg - Wikipedia, the free encyclopedia
Not all contain Pd but they all contain some PM.
Eric









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