| Abbreviation | Definition |
|---|---|
| DSC | Digital Selective Calling |
| DSCP | Differentiated Services Code Point |
| DSCP | Differentiated Services Control Point |
| DSET | Division of Statewide Emergency Telecommunications |
| DSI | Digital Speech Interpolation |
| DSLAM | Digital Subscriber Line Access Module |
| DSN | Defense Switched Network |
| DSPI | Digital Speckle Pattern Interferometry |
| DSRF | Device Savings Recovery Fee |
| DSS | Digital Subscriber Signalling |
| DSTE | Divisional Signal Telecommunication Engineer |
| DSU | Digital Service Unit |
| DSVD | Digital Simultaneous Voice and Data |
| DSX | Digital Signal Cross-connect |
| DSX-2 | Digital Stream Crossconnect 2 (6.312 Mbps) |
| DSX-3 | Digital Stream Crossconnect 3 (44.736 Mbps) |
| DT | Dial Tone |
| DT | Dialup Terminal |
| DT | DWDM (Dense Wavelength Division Multiplexing) Terminal |
| DTAP | Direct Transfer Application Process |