\\ More than 3500 Telecom abbreviations maintained by Ioan (Nini) Indreias // 1 A B C D E F G H I J K L M N O P Q R S T U V W X Y All words P/AR Peak to Average Ratio P/F Poll/Final Bit P2P Peer-To-Peer PA Pointer Adjustment PA Preamble (LAN) PA PreArbitrated PABX Private Automatic Branch Exchange PACS Personal Access Communication System PAD Packet assembler/disassembler (GSM) PAD Packet Assembler/Disassembler (X.25) PAD Packet Assembly-Disassembly PAL Phase Alternate Line PAM Pass Along Message PAM Pulse Amplitude Modulation PAMR Public Access Mobile Radio PANS Pretty Amazing New Services (B-ISDN) PAP Printer Access Protocol PAP Process/Application Protocol PAP Public Access Profile (DECT) PAR Positive Acknowledgement with Retransmission PAR Prompted Auto-Redial service PARC Xerox Palo Alto Research Center PASP Public Service Answering Point PAW Personal Area Wireless PBD Power Board PBX Private Branch Exchange PC Personal Computer PC Point Code PC Program Counter PCA Plug-In Comunication API PCB Printed Circuit Board PCB Process Control Block PCF Point Coordination Function PCH Paging Channel (GSM) PCI Peripheral Component Interconnect PCI Peripheral Components Interface PCI Protocol Control Information PCIO Program Controlled I/O PCM Pulse Code Modulation PCMCIA Personal Computer Memory Card Interface Association PCN Personal Communications Network PCNE Protocol Converter for Non-SNA Equipment PCR Peak Cell Rate (ATM) PCS-1900 Personal Communications Systems 1900MHz PCS Personal Communications Services PCTF Per-Call Test Failure PCU Packet Control Unit PCU Premises Control Unit PD Premier Dialing PD Propagation Delay PD Protocol Discriminator (GSM) PDA Personal Data/Digital Appliance/Assistant PDA Personal Digital Assistant PDC Personal Digital Communications PDC Power Distribution Center PDF Portable Document Format PDF Portable Document Format] PDH Plesiochronous Digital Hierarchy PDI-P Payload Defect Indicator-Path PDI-V Payload Defect Indicator-Virtual PDM Physical Medium Dependent (FDDI) PDN Public Data Network PDP Packet Data Protocol PDP Policy Decision Point PDS Premises Distribution System PDU Power Distribution Unit PDU Protocol Data Unit PEDC Pan European Digital Communications PEL Picture Element PEP Partitioned Emulation Program PEP Policy Enforcement Point PER Packed Encoding Rules PF Polycenter Framework PFDL Policy Framework Definition Language PFM Packet Forwarding module PG Peripheral Gateway PGS Pair Gain System PGTC Pair Gain Test Controller PH Packet Handler (ISDN) PHS Packet Handling System PHS Personal Handy Phone System (Japan) PHY-PCI Physical Layer-Protocol Control Information PHY-SAP Physical Layer-Service Access Point PHY-SDU Physical Layer-Service Data Unit PHY Physical Layer PHYM Physical Layer Management PI Plug-In PI Process Improvement PIB Policy Information Base PIC Plug-In Container PIC Point In Call PIC Primary Interexchange Carrier PIC Programmable Interrupt Controller PICC Prescribed Interexchange Charge PICC Primary Interexchange Carrier Charge PID Path Identification PIG Proprietary Information Guidelines (legal document PIM Peripheral Interface Manager (Cisco) PIM Product Integration Manager PIN Personal Identification Number PIN Positive Intrinsic Negative PINS Plug-In Network Sensor PIP Pre-Impulsing Pulse PIT Process Integration Testing PIU Path Information Units (SNA) PJC Pointer Justification Count PKI Public Key Infrastructure PKI Public Key software Infrastructure PL/SQL Procedural Language/Structured Query Language (Database) PL Private Line PLA Programmable Logic Array PLAR Private Line Automatic Ringdown PLB Payload Loop Back PLC Power Line Carrier PLCP Physical Layer Convergence Protocol (DQDB) PLIM Physical Layer Interface Module (Cisco) PLMN Public Land Mobile Network PLMN Public Land Mobile Network (GSM - UMTS) PLP Packet Layer Protocol (X.25) PLP Presentation Level Protocol PLS Private Line service PLU Percentage Local Usage PLU Primary Logical Unit PM Performance Monitoring PM Peripheral Modules PM Phase Modulation PM Physical Medium PM Privacy Manager service PMA Physical Medium Attachment PMC PCI Mezzanine Card PMD Physical Medium Dependent (FDDI) PMR Private Mobile Radio(communications) PMTS Principal Member of Technical Staff PNNI Private Network Node Interface PNS Packet Switching Node POC Positive Outage Control POCSAG Post Office Code Standardisation Group POD Programmable Option Devices POF Pending Order File POH Path Overhead (SONET) POI Point of Interconnection PON Passive Optical Network POP3 Post Office Protocol 3 POP Point Of Presence PoP Points of Presence POP Post Office Protocol PoS Packet Over SONET POS Point Of Sale POSI Promotion of OSI POSIT Profiles for Open Systems Interworking Technologies POSIX Portable Operating System Interface for UNIX POST Power-On Self Test POST Power-On Self-Test POT Point Of Termination POTS Plain Old Telephone Service POTS Plain Old Telephone Service/System POTS Plain Old Telephony Service PP Payload Pointer PPB PrePaid Billing (Sicap) PPC PrePaid Core (Sicap) PPD Parallel Presence Detect PPD Preferred Payment Date PPD Project Profile Database PPDU Presentation Protocol Data Unit PPM Processor Power Module (HP) PPP Point-to-Point Protocol (IETF) PPS Packets Per Second PPS PrePaid Server PPSN Public Packet Switched Network PPSP PPS Proxy PRA Primary Rate Access PRBS Pseudo-Random Binary Sequence PRBS Pseudo-Random Bit Sequence PRC Primary Reference Clock PRD Prompted Repeat Dial service PRD Pseudo-Random Downstream PREMIS Premises Information System PRI Primary Rate Interface PRI Primary Rate Interface (ISDN) PRM Performance Report Message PROFREQ Profile Request PROFS Professional Office System PROM Programmable Read Only Memory PRS Personalized Response System PRS Primary Reference Source PRS Project Requirements Specifications PRSIG Pacific Rim SMDS Interest Group PRU Pseudo-Random Upstream PS Packet Switch PSAP Primary Safety Answering Point PSB Public Service Board PSC Primary Scrambling Code (GSM - UMTS) PSC Public Service Commission PSD Product Specification Document PSDM Premium Substrate Data Mux PSDN Packet Switched Data Network PSDN Public Switched Data Network PSDS Public Switched Data Services PSDS Public Switched Digital Service PSELFEXT Power Sum Equal Far End Cross Talk PSI Packet Switching Interface (DNA) PSI Performance Systems International PSK Phase Shift Keying PSN Alternative to PSTN (Public Switched Telephone Network) PSNEXT Power Sum Near End Cross Talk PSP ProLiant Support Pack (HP) PSPDN Packet Switched Public Data Network PSPDN Public Switched Packet Data Network PSRCP Public Safety Radio Communications Project PSTN Public Switched Telephone Network PSU Power Supply Unit PSW Program Status Word PSX Power System Exchange PT Payload Type PTE Path Terminating Equipment (SONET) PTI Packet Type Identifier (X.25) PTI Payload Type Identifier (ATM) PTI Payload Type Indicator PTM Packet Transfer Mode PTM Packet Transfer/Transport Mode PTN Personal Telephone Number PTN Public Telephone Network PTO Public Telecommunication Operator PTT Post Telephone & Telegraph admin PTT Push-to-Talk (PMR) PTZ Pan-Tilt-Zoom (Camera) PU Physical Unit PU Physical Unit (SNA) PUC Public Utilities Commission PUK PIN Unblocking Key (GSM) PVC Permanent Virtual Circuit/Connection PVN Private Virtual Network PVT Product Validation Testing PWT Personal Wireless Telecommunications PXE Preboot eXecution Environment PZN PersonaliZed telephone Number SMBZ - SaMBoZaur - test for propagation of define: