In order to access the Internet through the PSTN, a connectivity device that you must use is a modem.
What is a modem?
A modem can be defined as a type of networking device that is designed and developed to convert the signals from the wire such as a telephone line, so that data can be sent and received by a computer.
In Computer networking, modem is a connectivity device that you must use to access the Internet through the Public Telephone Service Network (PSTN).
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