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About: Telephone keypad     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:Whole100003553, within Data Space : dbpedia.demo.openlinksw.com associated with source document(s)

Type: yago:WikicatComputerKeyboardsyago:Artifact100021939yago:ComputerKeyboard103085013yago:DataInputDevice103163973yago:Device103183080yago:ElectronicEquipment103278248yago:Equipment103294048yago:Instrumentality103575240yago:Keyboard103614007yago:Object100002684yago:Peripheral103916720yago:PhysicalEntity100001930yago:Whole100003553 New Facet based on Instances of this Class

A telephone keypad is a keypad installed on a push-button telephone or similar telecommunication device for dialing a telephone number. It was standardized when the dual-tone multi-frequency signaling (DTMF) system was developed in the Bell System in the United States in the 1960s that replaced rotary dialing originally developed in electromechanical switching systems. Because of the installed abundance of rotary dial equipment well into the 1990s, many telephone keypads were also designed to produce loop-disconnect pulses electronically, and some could be optionally switched to produce either DTMF or pulses.