Just want to correct the record here, as someone who worked at a local CLEC where we took availability quite seriously before the age of the self-defeatist software engineer.
Phone lines absolutely did not go down. Physical POTS lines (Yes, even the cheap residential ones) were required to have around 5 9s of availability, or approximately 5 minutes per year. And that's for a physical medium affected by weather, natural disasters, accidents, and physical maintenance. If we or the LEC did not meet those targets contracts would be breached and worst case the government would get involved.
Okay, as someone who also worked in that era I’ll be pedantic: internal phone systems went down. I experienced it multiple times so I certainly know it happened.
FWIW nothing I said was “self defeatist”, I made it clear I don’t think it’s a good thing. It’s just a simple financial reality that the additional redundancy isn’t worth the extra cost in a lot of situations.
Phone lines absolutely did not go down. Physical POTS lines (Yes, even the cheap residential ones) were required to have around 5 9s of availability, or approximately 5 minutes per year. And that's for a physical medium affected by weather, natural disasters, accidents, and physical maintenance. If we or the LEC did not meet those targets contracts would be breached and worst case the government would get involved.