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What is a modem "handshake"? What happens when modems handshake?

A modem handshake is what occurs when the receiving modem answers the phone call and the two modems begin to communicate. Before anything else happens, the modems must evaluate the quality of the line, negotiate error control protocols and data compression that they can both recognize, and work out what the most suitable connection speed should be, based on the conditions. This process is called the handshake. If the modem's internal speaker is turned up, you'll hear the handshake as screeches, bells, and whistles. Once that has happened, the modems send data back and forth between the two computers. The modem that initiates the connection sends data in a lower frequency range and listens for the response in a higher range, corresponding to the recieving modem.


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