Public Switch Telephone Network (PSTN)

PSTN:
Ø The 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.
Ø 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 any telephone in the world to communicate with any other.
Ø Originally a network of fixed-line analog telephone systems, the PSTN is now almost entirely

    digital in its core network and includes mobile and other networks, as well as fixed telephones.
Ø The technical operation of the PSTN belongs to the standards created by the ITU-T. These

    standards allow different networks in different countries to interconnect seamlessly.

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