| Abbreviation | Definition |
|---|---|
| DUN | Dial-Up Networking |
| DUNC | Dial-Up Networking Connection |
| DUNCE | Dial-Up Networking Connection Enhancement |
| DUV | Data Under Voice |
| DV | Data and Voice |
| DVC | Digital Video Compression |
| DVI | Digital Video Interleaved |
| DVS | Descriptive Video Service |
| DX | Duplex |
| DXC | Digital Cross Connect |
| E | Echo |
| E&M | Earth and Magneto (signaling leads) |
| E911 | Enhanced 911 |
| EA | Extended Address |
| EAI | Enterprise Application Integration |
| EARFCN | EUTRA Absolute Radio Frequency Channel Number |
| EAS | Extended Area of Service |
| EAS | Extended Area Service |
| EB | Expanded Basic |
| EBCDIC | Extended Binary-Coded Decimal Interchange Code |