DCN：Date Communication Network，數(shù)據(jù)通信網(wǎng)

DPC：Destination Point Code，目的信令點(diǎn)編碼。關(guān)聯(lián)詞：OPC

DSS：Decision Support System，決策支撐系統(tǒng)

DSS1：Digital Subscriber Signalling No: 1，數(shù)字用戶信令No: 1

DST：Daylight Saving Time，日光節(jié)約時(shí)間(夏令時(shí)) 

DTMF：Dual Tone Multi-Frequency，雙音多頻

DUP：Data User Part，數(shù)據(jù)用戶部分。關(guān)聯(lián)詞：ISUP、TUP