P
 | P3P Platform for Privacy Preferences Standard developed by WWW consortium internet standards body. Alerts user via browser when a web site fails to meet privacy standards
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| PABX Private Automatic Branch Exchange An in-house telephone switching system that interconnects telephone extensions to each other as well as to the outside telephone network.
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| PAD Packet Assembler Disassembler
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| PAE Power Added Efficiency
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| PAL Phase Alteration Line Video standard for many European countries
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| PAM Pulse Amplitude Modulation
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| PAN Personal Area Network Also known as Piconets. Enables devices to communicate over short distances
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| PAT Port Address Translation
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| PAT Program Association Table
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| PBX Private Branch eXchange
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| PC Personal Computer Generally referred to as IBM compatible
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| PCI Peripheral Component Interconnect Common Bus architecture for the connection of peripherals
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| PCIA Personal Communications Industry Association
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| PCL Printer Control Language Hewlett Packard standard for driving their range of printers
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| PCM Pulse Code Modulation
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| PCMCIA Personal Computer Memory Card International Association Common to portable computers, defines the standards of connection for "credit card" size peripherals
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| PCN Personal Communications Network
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| PCR Peak Cell Rate
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| PCR Program Clock Reference
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| PCS Personal Communications System Two way digital wireless devices
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| PCTV Personal Computer TeleVision A combined PC and Television unit
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| PCX A common graphics standard
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| PDA Personal Digital Assistant Portable devices used to access computer information. Corporate or Internet.
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| PDF Portable Document Format A file format defined by Adobe and widely used on the Internet
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| PDF Package Definition File
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| PDH Plesiochronous Digital Hierachy
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| PDN Primary Directory Number
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| PDN Public Data Network
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| PDT Printer Definition Table
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| PDU Packet Data Unit
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| PDU Protocol Data Unit
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| PE PolyEthylene
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| PERL Practical Extraction and Reports Language
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| PES Packetised Elementary Stream
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| PGL Peer Group Leader
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| PGP Pretty Good Privacy Encrypts data which is unscrabled by the recipient using a shared key
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| PHB Packet Hop Behaviour
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| PHD Power Hybrid Doubler
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| PHY PHYsical Layer
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| PIC Programmable Interrupt Controller Prioritises interrupts ( IRQ ) and passes to CPU
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| PICS Protocol Implementation Conformance Statement
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| PID Process Identification Number
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| PID Packet IDentifier
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| PIF Program Information File A file used to store information about a DOS programme. Generally used as a short cut
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| PIM Protocol Identification Number
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| PIN Personal Identification Number Used in digital wireless devices
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| PING Packet INternet Gopher
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| PIP Picture In Picture Displays two separate TV pictures to the same screen at the same time
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| PIX Proprietary Identifier eXtension
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| PKI Public Key Information
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| PLAN Programming LANguage
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| PLAR Private Line Auto Ringdown
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| PLC Power Line Communications
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| PLCP Physical Layer Convergence Protocol
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| PLL Phase Locked Loop
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| PLOU Physical Layer Overhead Unit
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| PM Phase Modulation
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| PMD Physical Medium Dependent
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| PMP Point to MultiPoint
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| PMT Program Map Table
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| PN Pseudo random Noise
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| PNG Portable Network Graphics
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| PNNI Private Network to Network Interface
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| PNP Plug aNd Play
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| POH Powered On Hours Used to describe the "up time" of a system
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| POH Path OverHead
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| POI Power Overhead Indicator
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| POP Point Of Presence The location of a dial up service, commonly used for local access to the internet
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| POP Post Office Protocol
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| POP3 Post Office Protocol 3
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| POTS Plain Old Telephony Systems
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| PPDU Presentation Protocol Data Unit
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| PPK Private Public Key
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| PPM Pages Per Minute Used to describe the speed of a printer
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| PPM Peak Program Meter
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| PPM Part Per Million
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| PPP Point To Point Protocol Often referred to in connection with data transmission by telephone to computer direct |
| PPSN |
Public Packet Switched Network
| PPTP |
Point to Point Tunnelling Protocol
| PPVPay Per View
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| PQA Palm Query Application
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| PRBSPseudo Random Bit Sequence
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| PRI Primary Rate Interface ISDN
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| PRISM Parallel Redused Instruction Set Multiprocessing
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| PRNG Pseudo Random Noise Generation
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| PROM Programmable Read Only Memory
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| PS Power Supply
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| PSA Professional Services Automation A set of applications designed to improve staff utilisation and product management for professional service organisations especially IT service companies.
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| PSC Public Service Commission
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| PSI Program Specific Information
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| PSK Phase Shift Keying
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| PSTNPublic Switched Telephone Network
The world wide voice telephone network
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| PSU Power Supply Unit
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| PT Payload Type ATM
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| PTE Path Terminating Equipment
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| PTI Payload Type Identifier
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| PTR Punched Tape Reader
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| PTR Pointer Reversed
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| PTS Protocol Type Selection
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| PTT Post Telegraph and Telephone
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| PU Presentation Unit
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| PVC Permanent Virtual Circuit
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| PVK PIN Verification Key
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| PVPC Permanent Virtual Path Connection ATM
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| PVR Personal Video Recorder Combines internet, games and recording into a single set top box
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| PVVPIN Verification Value
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| PXE Pre boot eXecution Environment
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