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.

At the turn of the 21st century, the oldest parts of the telephone network still use analog technology for the Last Mile Loop to the end user. However, Digital Communications such as DSL, ISDN, FTTx, and cable modems have become more common in this portion of the network.

Several large private telephone networks are not linked to the PSTN. Some of these are:

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« This page (revision-4) was last changed on 20-Feb-2017 14:10 by jim