P

PABX      Private Automatic Branch eXxchange
PACS      Personal Access Communications System
PAD       Packet Assembler-Disassembler
PAL       Phase Alteration Line
PAM       Pulse Amplitude Modulation
PAMR      Public Access Mobile Radio
PAP       Password Authentication Protocol (PPP)
PAP       Public Access Profile (DECT)
PAS       Performance Animated System
PAT       Port Address Translation
PAX       Private Automatic Exchange
PBX       Private Branch EXchange
PC        Printed Circuit
PC        Personal Computer
PCH       Paging CHannel (GSM)
PCM       Pulse Code Modulation
PCMCIA    Personal Computer Memory Card International Association
PCME      Packetized Circuit Multiplication Equipment
PCN       Personal Communication Network
PCR       Pead Cell Rate
PCS       Personal Communication Services
PDA       Personal Digital Assistant
PDC       Personal Digital Cellular (standard giapponese)
pdf       probability density function
PDFA      Praseodymium-Doped Fiber Amplifier
PDFFA     Praseodymium-Doped Fluoride-Fiber Amplifier (PDFFAs)
PDG       Polarization Dependent Gain
PDH       Plesiochronous Digital Hierarchy
PDL       Polarization Dependent Loss
PDN       Public Data Network
PDSN      Public Data Switched Network
PDU       Protocol Data Unit
PEM       Privacy Enhanced Mail
PERL      Practical Extraction and Report Language
PERSIA    PERSonal Information Agent
PFD       Power Flux Density
PH        Packet Handler
PHP       Personal HandyPhone
PHS       Personal Handyphone System
PHY       PHYsical (livello 1 FDDI)
PKI       Public Key Infrastructure
PICS      Protocol Implementation Conformance Statement
PIN       Personal Identification Number
PLC       Packet Loss Concealment (G.711 u/a)
PLL       Phase-Locked Loop
PLMN      Public Land Mobile Network
PM        Phase Modulation
PMD       Polarization Mode Dispersion
PMD       Physical Medium Dependent (livello 1 FDDI)
PMR       Private Mobile Radio
PMR       Private Mobile Radio
PMT       Personal Mobile Telecommunications
PN        Power Node
PNAF      Piano Nazionale di Assegnazione delle Frequenze (It)
PNNI      Private Network Node Interface
PNO       Public Network Operator
PON       Passive Optical Network
POP       Point of Preference
POP       Point of Presence
POS       Point of Sale
POS       Personal Operating Space (802.15)
POTS      Plain Old Telephone Service
POTV      Plain Old Television
PPC       Pay-Per-Channel
PPF       PACS Providers Forum
PPP       Point-to-Point Protocol
PPV       Pay-Per-View
PRI       Primary-Rate ISDN
PRK       Phase Reversal Keying (=BPSK)
PROM      Programmable Read-Only Memory
PS II     Personal Secretary II
PSC       Public Service Commission
PSI-CELP  Pitch-Synchronous Innovation-Code Exited Linear Prediction
PSK       Phase Shift Keying
PSN       Public Switched Network
PSNR      Peak Signal-to-Noise Ratio
PSS       UK Public Packet Switching Service
PSTN      Public Switched Telephone Network
PSV       Polarization State Variation
PT        Payload Type (ATM frames)
PTAR      Prime Time Access Rule
PTB       Priority Token Bank
PTT       Postal Telegraph and Telephone Authority
PTTA      Postal Telephone and Telegraph Administration
PUC       Public Utility Commission
PVC       Permanent Virtual Circuit 
PVN       Private Virtual Network
PVPC      Permanent Virtual Path Connection
PW        Pulse Width
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