DCN:Date Communication Network,数据通信网
DPC:Destination Point Code,目的信令点编码。关联词:OPC
DSS:Decision Support System,决策支撑系统
DSS1:Digital Subscriber Signalling No: 1,数字用户信令No: 1
DST:Daylight Saving Time,日光节约时间(夏令时)
DTMF:Dual Tone Multi-Frequency,双音多频
DUP:Data User Part,数据用户部分。关联词:ISUP、TUP