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Signaling System No. 7 (SS7/C7): Protocol, Architecture, and Services by Jeff Hewett, Lee Dryburgh

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Chapter 5. The Public Switched Telephone Network (PSTN)

The term Public Switched Telephone Network (PSTN) describes the various equipment and interconnecting facilities that provide phone service to the public. The network continues to evolve with the introduction of new technologies. The PSTN began in the United States in 1878 with a manual mechanical switchboard that connected different parties and allowed them to carry on a conversation. Today, the PSTN is a network of computers and other electronic equipment that converts speech into digital data and provides a multitude of sophisticated phone features, data services, and mobile wireless access.

TIP

PSTN voice facilities transport speech or voice-band data (such as fax/modems and digital data), ...

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