Public switched telephone networks

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The public switched telephone network (PSTN) is the concatenation of the world’s public circuit-switched telephone networks, in much the same way that the Internet is the concatenation of the world’s public IP-based packet-switched networks. Originally a network of fixed-line analog … Read More

Land-line based phone systems and fixed telephony

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Modern emergency telephone powered by sound alone. The network that connects most phones together is known as the PSTN (public switched telephone network). Fixed phone lines are usually copper wirelines which form a circuit between the subscriber and the exchange, … Read More