| Abbreviation | Definition |
|---|---|
| DCPZ | Daily withdrawal coincident with Customer Peak for a Zone |
| DCR | Dropped Call Rate |
| DCS | Digital Cellular System |
| DCS | Digital Cross-Connect |
| DCSS | Digital Cross-Connect System |
| DCT | Digital Cordless Telecommunications |
| DCTU | Dominant certificated telecommunications utility |
| DD | Digit Directory |
| DDCNZ | Daily Demand Charge for Non-Zone Network Load |
| DDCZ | Daily Demand Charge for a Zone |
| DDD | Direct Distance Dialing |
| DDI | Direct Dialing In |
| DDLD | Direct Dial Long Distance |
| DDRS | Dynamic Data Rate Selection |
| DDS | Digital Data Service |
| DDSD | Delay Dial Start Dial |
| DDTP | Deaf Disabled Telecommunications Program |
| DE | Discard Eligibility |
| DECT | Digital Enhance Cordless Telecommunications |
| DECT | Digital Enhanced Cordless Telecommunications |