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NO PSTN NETWORKS ARE NOT RELIABLE. The PSTN is he telephone network that links the world together.

The 1st answer has some truth to it, but most of the time (except in the case of fios of other fiber services) you do use the PSTN (Public Switched Telephone Network) to connect to the internet as is in the case of dial up and dsl. However the internet is partly a pstn network and when is the last time the entire internet went down, all across the world. The internet is the worlds most reliable network, and the largest. How the PTSN works, is a whole book (or two) in its own, being compromised of millions, possibly billions of miles of cable and many various satellite, radio, and cable networks within its self. The electrical grid is much less reliable since outages happen several times a year while I've only had mabye 1 phone outage in my life.

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Q: What is pstn network how it works is it reliable source of communication?
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