- 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.
public switched telephone network (PSTN)
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: