The public switched telephone network is a global system that has developed over several decades. From the early research of Alexander Graham Bell, telecommunications companies evolved the PSTN architecture that provided for yesterday's landline voice communications. One important distinction with the public switched telephone network is that it stands in contrast to private exchange networks.

A PSTN network topology is the switching network topology of a telephone network connected to the public switched telephone. Hardware and software for.

Private branch exchanges and other technologies allowed companies and other parties to create more individual telephone lines that were not represented in the PSTN and public landline architecture. Explode Spline Autocad 2012. One way to explain this is that individual lines were built into private endpoint systems, so that an individual recipient could have many different individual phone lines using the same public switched telephone network trajectory. Today, as smartphones and mobile devices continue to proliferate, wireless telecom networks are taking up market share and PSTN landline technology is diminishing. In some places, less industrialized communities have skipped directly from an underserved or insufficient public switched telephone network architecture directly to the use of cell phones and mobile devices.