电信专业英英词典D-7
时间：2006-08-18 16:00:00
（单词翻译:单击）
DSU
data service unit
DTMF
dual1 tone multiple frequency
DTS
digital termination service
Dual-Tone Multiple Frequency (DTMF)
the generic2 name for the tone signaling scheme used to signal from telephones to switching equipment, in which 10 decimal digits3 and two auxiliary4 characters are represented by selecting two frequencies of the following group: 697, 770, 852, 941,1209,1336,1447 Hz.
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