话音传送数字数据(Digital Data Over Voice) DDOV

数字数据采集系统(Digital Data Acquisition System) DDAS

蜂窝数字分组数据(Cellular Digital Packet Data) CDPD

数字数据处理系统(Digital Data Handling System) DDHS

串行数字数据接口(Serial Digital Data Interface) SDDI

数字全息数据存储(Digital Holographic Data Storage) DHDS

数字数据交换标准(Digital Data Exchange Specification) DDES

数字数据通信(Digital Data Communication) DDC

数字数据网络(Digital Data Network) DDN