A telecommunications network is the network of lines, trunks and telephone switches operated by telephone companies, long distance companies and Competitive Local Exchange Carriers.
When referring to our local telecommunications service such as we would have in our homes, we generally refer to the Public Switched Telephone Network (PSTN) which is a heirarchial network that is heavily regulated to provide highly reliable service. Calls are placed on this network via a multi-frequency tone or rotary dial signalling.
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