PA Preamble
PACS Personal Access Communications System
PAD Packet Assembler-Disassembler
PAL Phase Alternating by Line
PAN Personal Area Network
PAP Password Authentication Protocol
PB Petabyte (l,000,000,000,000,000 bytes)
PBX Private Branch Exchange
PC Personal Computer
PCB Printed Circuit Board
PCH Paging Channel
PCI Peripheral Component Interface
PCM Pulse Code Modulation
PCN Personal Communications Networks
PCS Personal Communications Services
PCT Private Communication Technology
PDA Personal Digital Assistant
PDF Portable Document Format (Adobe Systems)
PDN Packet Data Network
PDU Payload Data Unit
PEM Privacy Enhanced Mail
PERL Practical Extraction and Reporting Language
PGP Pretty Good Privacy
PHS Personal Handyphone System
PHY Physical Layer
PIM Personal Information Manager
PIN Personal Identification Number
PIN Positive-Intrinsic-Negative
PIP Picture-in-a-Picture
PKE Public Key Encryption
PLMRS Private Land Mobile Radio Services
PMA Physical Medium Attachment
PMD Physical Media Dependent
PnP Plug and Play
PoS Packet over SONET
POP Point of Presence
POP Post Office Protocol
POS Point of Sale
POTS Plain Old Telephone Service
PPN Policy Powered Network (3Com Corp.)
PPP Point to Point Protocol
PPS Packets Per Second
PPTP Point-to-Point Tunneling Protocol
PQ Priority Queuing
PRI Primary Rate Interface (ISDN)
PSAP Public Safety Answering Point
PSN Packet Switched Network
PSTN Public Switched Telephone Network
PT Payload Type
PTT Post Telephone & Telegraph
PU Physical Unit (IBM Corp.)
PUC Public Utility Commission
PUK Personal Unblocking Key
PVC Permanent Virtual Circuit
PWT Personal Wireless Telecommunications
PXE Preboot Execution Environment
