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The service whereby a dial telephone can be used to initiate and effect station-to-station telephone calls.
In computer networks, pertaining to terminals which must dial up to receive service, as contrasted with those hand-wired or permanently connected into the network.
dial-up(1) To phone someone. See rotary dial.
(2) Using the switched telephone network to send data from a computer to a remote device. Using a modem, the computer's digital data are converted to analog signals in the same frequency range as human voice. At the other end, another modem converts the analog back to digital. For home users, dial-up was the first Internet access service available. It was followed by ISDN, cable and DSL. See modem and dial-up network.