| Abbreviation | Definition |
|---|---|
| DECT | Digital Enhanced Cordless Telephony |
| DECT | Digitally Enhanced Cordless Telecommunications |
| DEMUX | DEMUltipleXer |
| DF | Dark Fiber |
| DF | Distributing Frame |
| DFA | Distribution Feeder Antenna |
| DFMS | Data From Mobile Station |
| DFRI | Datacom Reference Frame Input |
| DFTS | Defence Fixed Telecommunications Service |
| DFT-S-OFDM | Discrete Fourier Transform Spread Orthogonal Frequency Division Multiplexing |
| DGPT | Directorate General of Posts and Telecommunications |
| DGT | Deputy General of Telecommunication |
| DGT | Directorate General of Telecommunications |
| DH | Delivery Head |
| DHD | Dial Home Device |
| DIA | Dedicated Internet Access |
| DICOM | Digital Imaging and Communications in Medicine |
| DIL | Direct Inward Line |
| DIP | Dialup Internet Protocol |
| DIRC | Digital Image Rights Computator |