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MCSE : Security Specialist Install, configure, and manage modems. A modem is a device that makes it possible for computers to communicate over telephone lines. The word modem comes from Modulate and Demodulate. Because standard telephone lines use analog signals, and computers digital signals, a sending modem must modulate its digital signals into analog signals. The computers modem on the receiving end must then demodulate the analog signals into digital signals. Modems can be external, connected to the computers serial port by an RS-232 cable or internal in one of the computers expansion slots. Modems connect to the phone line using standard telephone RJ-11 connectors. Check Device Manager to see if the modem is listed and working properly if not reinstall drivers, if this does not work:   Check for conflicting IRQ's Check port number Check that card is seated in the mother board properly