| Abbreviation | Definition |
|---|---|
| PHF | Peak Hour Factor |
| PHS | Packet Handling System |
| PHS | Peak Hour Service |
| PHS | Personal Handyphone System |
| PIB | Policy Information Base |
| PIC | Personal Instant Communications |
| PIC | Phone, Internet, and Cable |
| PIC | Primary Interexchange Carrier |
| PICC | Primary Interexchange Carrier Charge |
| PIK | Premises Installation Kit |
| PILD | Pre-subscribed Inter-exchange Long Distance |
| PIM | Passive Inter-Modulation |
| PIP | Pre-Impulsing Pulse |
| PITA | Pacific Islands Telecommunication Association |
| PITS | Proprietary Integrated Telephone System |
| PIXIT | Protocol Implementation eXtra Information for Testing |
| PJC | Pointer Justification Count |
| PL | Private Line |
| PLA | Programmable Logic Array |
| PLAR | Private Line Automatic Ringdown |