| Abbreviation | Definition |
|---|---|
| PCS | Personal Communications Service |
| PCT | Personal Communication Telephone |
| PCTF | Per-Call Test Failure |
| PCTN | Pacific Consolidated Telecommunications Network |
| PCX | Private Communication eXchange |
| PD | Protocol Discriminator |
| PDC | Personal Digital Cellular |
| PDC | Personal Digital Communications |
| PDD | Post Dial Delay |
| PDH | Plesiochronous Digital Hierarchy |
| PDI-P | Payload Defect Indicator - Path |
| PDN | Public Data Network |
| PDP | Policy Decision Point |
| PDQ | Predictive Differential Quantizing |
| PDSN | Packet Data Service Node |
| PEML | Prompt Engine Markup Language |
| PEP | Policy Enforcement Point |
| PERO | Parameter Entity Reference Open |
| PFDL | Policy Framework Definition Language |
| PGS | Pair Gain System |