![]() What's the difference between PSTN and ISDN? To make an international call, a user has to dial the country code. A user who wants to call a number outside the local exchange has to add an area code. The lines within a local exchange typically have the same area code. The individual subscriber lines are connected to a local exchange, which communicates with trunk exchanges as well as main and central exchanges. The traditional PSTN has a hierarchical architecture and a star structure. In the early days of the internet, this was the main method for home internet access but it became obsolete with the introduction of broadband internet services. Dial-up internet connections support up to 56 Kbps. The PSTN phone line is used with traditional dial-up network modems to connect a computer to the internet. Voice signals can then travel over the connected phone lines. A call is placed after being routed through multiple switches. ![]() ![]() A PSTN lets users make landline telephone calls to one another.Ī PSTN is made up of switches at centralized points on a network that function as nodes to enable communication between two points on the network. How does PSTN work?Ī public switched telephone network is a combination of telephone networks used worldwide, including telephone lines, fiber optic cables, switching centers, cellular networks, satellites and cable systems. The phones themselves are known by several names, such as PSTN, landlines, Plain Old Telephone Service ( POTS), or fixed-line telephones. Using underground copper wires, this legacy platform has provided businesses and households alike with a reliable means to communicate with anyone around the world for generations. ![]() It's the aggregation of circuit-switching telephone networks that has evolved from the days of Alexander Graham Bell. This is the system that has been in general use since the late 1800s. These networks provide the infrastructure and services for public telecommunication. PSTN comprises all the switched telephone networks around the world that are operated by local, national or international carriers. PSTN is the traditional circuit-switched telephone network. The public switched telephone network, or PSTN, is the world's collection of interconnected voice-oriented public telephone networks. ![]()
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