You may sometimes find POTS service being referred to as the public switched telephone network, or PSTN for short. The service was later taken from the hands of national post offices, and the term Plain Old Telephone Service was adopted. This is because, in the early days, callers relied on post office operators to connect them to their intended destinations. Initially, POTS was known as the Post Office Telephone Service. But advancements in technology has seen many of those lines buried underground. The first phone lines were suspended across poles, traversing the entire country.
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But the POTS most of us are familiar with is an upgrade over the rudimentary phone system invented by Alexander Graham Bell. POTS networks were created to facilitate voice communication over copper cables that traversed countries and continents, and it has been the standard voice-grade telephone system used by residences and businesses across the world since the 1880’s. It is the phone line technology most of us grew up with at home and is exactly what you think it is: copper wires dangling overhead, carrying your voice from one place to another. POTS is basically an analog voice transmission phone system implemented over copper twisted pair wires.
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The name given for this traditional telephone service is POTS (for plain old telephone service).
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Truth bomb: In essence, a phone line is the quintessential definition of the traditional landline phone system which relies on a physical wire. The phrase “phone line” is often used, even in an era when more and more businesses are starting to rely on modern telephone systems like VoIP.