public switched telephone network (PSTN)

Posted on November 12, 2009. Filed under: CCNA, ICND1 break down |


The public switched telephone network (PSTN) is the network of the world’s public circuit-switched telephone networks, in much the same way that the Internet is the network of the world’s public IP-based packet-switched networks. Originally a network of fixed-line analog telephone systems, the PSTN is now almost entirely digital, and now includes mobile as well as fixed telephones. There are many advantages for PSTN as a communications link:

  • Other than a modem, no additional equipment is required.
  • The cost associated with the implementation of a PSTN connection link for a WAN is relatively low.
  • The maintenance of a public telephone network is very high quality with few instances in which lines are not available.
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3 Responses to “public switched telephone network (PSTN)”

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Telephone systems that are wireless are great like cellphone. ^

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