电信专业英英词典D-7_电脑电信

　dsu

　data service unit

　dtmf

　dual tone multiple frequency

　dts

　digital termination service

　dual-tone multiple frequency (dtmf)

　the generic name for the tone signaling scheme used to signal from telephones to switching equipment, in which 10 decimal digits and two auxiliary characters are represented by selecting two frequencies of the following group: 697, 770, 852, 941,1209,1336,1447 hz.