PAC Paging Area Controller

PACE Paging Access Control Equipment

PAD Packet Assembler Disassembler

PAM Pulse Amplitude Modulation

PAMR Public Access Mobile Radio

PBX Private Branch Exchange

PCM Pulse Code Modulation

PCN Personal Communications Network

PCS Personal Communications System

PCU Packet Control Unit

PDTN Public Data Transmission Network (same as RPD)

PFP Packet Forwarding Engine

PGP Pretty Good Privacy

PIN Personal Identity Number

PKI Public Key Infrastructure

PLMN Public Land Mobile Network

PLMR Public Land Mobile Radio

PMC Personal Mobile Communications

PMOP Phase Modulation On Pulse

PMR Private Mobile Radio

PMTS Private Mobile Telephone Service

PNC Paging Network Controler

PNNI Private Network to Network Interface (ATM routing protocol)

PNRP Peer Name Resolution Protocol (Technologie de réseau peer-to-peer - P2P)

POCSAG Post Office Code Standards Advisory Group (UK)

POP Point Of Presence (a node of communication) / Point de présence

POTS Plain Old Telephone System

PPP Point to Point Protocol

PPTP Point to Point Tunneling Protocol

PS Point Sémaphore

PSDN Packet Switched Data Network

PSDN Public Switched Data Network

PSK Phase Shift Keying

PSS Packet Switching Stream (British telecoms X 25)

PSTN Public Switched Telephone Network (similar to RTC)

PSU Packet Switching Unit

PURL Permanent Uniform Resource Locator

PWM Pulse Width Modulation / Modulation par largeur d'impulsion