![]() Now, thanks to fiber-optics, these cables can connect thousands of calls on the same shared line. ![]() And digital voice signals could share the same wire with other calls. Later, digital evolution replaced this system with automatic electronic switching. Operators would sit at a switchboard and literally connect the wires to connect two phones to a call. In the olden days, analog calls traveled across copper wires, and each call needed its own dedicated wire to connect a call. All these cables, lines, and centers connect everyone so that your call can move smoothly from your destination, through the network, to your recipient's destination. Think of the PSTN as the worldwide combination of telephone lines, underground wires, switching centers, cellular networks (including cell towers and satellites). VoIP sends and receives your voice communications (and other communications, too) over the internet rather than through the old school PSTN. Interfacing between the internet and the PSTN has traditionally been costly and challenging, which is why VoIP (Voice over Internet Protocol) is growing in reliability and popularity. The PSTN carries your voice calls from your telephone (whether that's a landline or cell phone) through the network to the recipient's phone. It works by using underground copper wires that are hardwired from homes and businesses to switching centers-where the phone calls are connected to each other. The PSTN is also referred to as Plain Old Telephone Service (POTS)-yes, I'm totally serious. PSTN stands for Public Switched Telephone Network, and it's the good ol' circuit-switched telephone network that's been in general use for the last century. ![]() ![]() However, the PSTN was no match for the evolution of the internet, and it's been in a steady decline for the last decade.Ĭurious what it is, how it works, and how it compares to modern-day communication solutions? If so, you're in the right place. This telecommunications system evolved with underground copper wires, undersea telephone cables, communication satellites, and even a digital core network into the PSTN as we know it today. Commercialization of the telephone began nearly 150 years ago, and the world started connecting to one another via the well-known (although rather unsightly) telephone lines. ![]()
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