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public switched telephone network (pstn) is the aggregate of the world's circuit-switched telephone networks that are operated by national, regional, or local telephony operators, providing infrastructure and services for public telecommunication . the pstn consists of telephone lines , fiber optic cables
, microwave transmission links, cellular networks , communications satellites , and undersea telephone cables , all interconnected by switching centers , thus allowing most telephones to communicate with each other. originally a network of fixed-line analog telephone systems, the pstn is now almost...
https://en.wikipedia.org/wiki/PSTN
public switched telephone network (pstn) is the aggregate of the world's circuit-switched telephone networks that are operated by national, regional, or local telephony operators, providing infrastructure and services for public telecommunication . the pstn consists of telephone lines , fiber optic cables
, microwave transmission links, cellular networks , communications satellites , and undersea telephone cables , all interconnected by switching centers , thus allowing most telephones to communicate with each other. originally a network of fixed-line analog telephone systems, the pstn is now almost...
https://en.wikipedia.org/wiki/Public_switched_telephone_network