| PA |
Power Amplifier |
| PA |
Preassigned |
| PA/TDMA |
Permanent Assignment TDMA |
| PAA |
Phased Array Antenna |
| PABX |
Private Automatic Branch Exchange |
| PAD |
Packet Assembler/Dissembler |
| PAD |
Programme Associated Data |
| PAL |
Phase Alternation Line (TV standard) |
| PAM |
Payload Assist Module |
| PAM |
Private Astronaut Mission |
| PAM |
Pulse Amplitude Modulation |
| PAMA |
Pre Assigned Multiple Access |
| PAM-D |
Payload Assist Module D |
| PANDA |
Processed Narrow Deviation Audio |
| PAPM |
Pulse Amplitude Phase Modulation |
| PAR |
Parity |
| PAT |
Process Analytical Technology |
| PBSC |
Packet Based Station Controller |
| PBX |
Private Branch Exchange |
| PC |
Personal Computer |
| PC |
Printed Circuit |
| PCDU |
Power Conversion and Distribution Unit |
| PCE |
Power Conditioning Electronics |
| PCM |
Phase Change Material |
| PCM |
Pulse Code Modulation |
| PCN |
Personal Communications Network |
| PCR |
Program Clock Reference |
| PCS |
Personal Communications Services |
| PCSS |
Personal Communications Satellite Services |
| PCU |
Power Control Unit |
| PCU |
Power Conversion Unit |
| PDA |
Personal Digital Assistant |
| PDC |
Primary DAMA Converter |
| PDF |
Probability Distribution Function |
| PDH |
Plesiochronous Digital Hierarchy |
| PDM |
Pulse Duration Modulation |
| PDR |
Preliminary Design Review |
| PDS |
Planetary Data System |
| PDT |
Pacific Daylight Time |
| PDU |
Power Distribution Unit |
| PDV |
Powered Descent Vehicle |
| PE |
Post Encounter |
| PeA |
Periapsis Altitude |
| PeD |
Periapsis Distance |
| PeR |
Periapsis Radius |
| PES |
Personal Earth Station |
| PeT |
Time to Periapsis |
| PF |
Power Factor |
| PFD |
Power Flux Density |
| PFM |
Pulse Frequency Modulation |
| PFO |
Pilot Frequency Oscillator |
| PG |
Primary Group |
| PG |
Prograde |
| PGO |
Probability of Go |
| PI |
Principal Investigator |
| PICA-X |
Phenolic Impregnated Carbon Ablative |
| PID |
Packet Identification |
| PIF |
Payload Integration Facility |
| PIM |
Passive Intermodulation |
| PIN |
Personal Identification Number |
| PIP |
Payload Integration Plan |
| PKM |
Perigee Kick Motor |
| PL |
Path Loss |
| PLF |
Payload Fairing |
| PLL |
Phase Locked Loop |
| PLMN |
Public Land Mobile Network |
| PM |
Phase Modulation |
| PM |
Post Meridiem |
| PMA |
Pressurised Mating Adapter |
| PMC |
Packet Modem Controller |
| PMD |
Propellant Management Device |
| PMF |
Propellant Mass Fraction |
| PMI |
Principal Moments of Inertia |
| PMP |
Parts, Materials and Process |
| PN |
Pseudorandom Noise |
| PN |
Pseudorandom Number |
| PNAPI |
Position Navigation Application Program Interface |
| PNT |
Positioning, Navigation and Timing |
| Pol |
Polarisation |
| Pol Ang |
Polarisation Angle |
| POP |
Point Of Presence |
| POP3 |
Post Office Protocol version 3 |
| POR |
Pacific Ocean Region |
| POS |
Point Of Sale |
| POTS |
Plain Old Telephony Services |
| P-P |
Peak to Peak |
| PPD |
Pay Per Day |
| PPE |
Power and Propulsion Element |
| PPF |
Payload Processing Facility |
| ppm |
parts per million |
| PPM |
Pulse Position Modulation |
| PPP |
Point to Point Protocol |
| pps |
Pulse Per Second |
| PPS |
Precise Positioning Service |
| PPTP |
Point to Point Tunnelling Protocol |
| PPU |
Power Processing Unit |
| PPU |
Propulsion Power Unit |
| PPV |
Pay Per View |
| PRA |
Pyrotechnic Relay Assembly |
| PRB |
Primary Reference Burst |
| PRBS |
Pseudo Random Binary Sequence |
| PRC |
Perceptive Radio Coding |
| PRCU |
Packet Radio Channel Unit |
| PRMA |
Packet Reservation Multiple Access |
| PRMS |
Packet Resource Management System |
| PROM |
Programmable Read Only Memory |
| Prop |
Propulsion |
| PRR |
Preliminary Requirements Review |
| PQM |
Proto Qualification Model |
| PRN |
Pseudo Random Noise |
| PRT |
Primary Reference Terminal |
| PS |
Power Supply |
| PS |
Proxy Server |
| PSD |
Power Spectral Density |
| PSE |
Packet Switch Exchange |
| PSDN |
Public Switched Data Network |
| PSI |
Program Specific Information |
| PSK |
Phase Shift Keying |
| PSN |
Packet Switching Network |
| PSN |
Private Satellite Network |
| PSPDN |
Packet Switched Public Data Network |
| PSSC |
Public Service Satellite Consortium |
| PST |
Pacific Standard Time |
| PSTN |
Public Switched Telephone Network |
| PSU |
Power Supply Unit |
| PSU |
Pyrotechnic Switching Unit |
| PTLU |
Pre Transmission Line Up |
| PTM |
Pulse Train Modulation |
| PTO |
Public Telecoms Operator |
| PTR |
Post Test Review |
| PTT |
Post Télégraphique Téléphonique |
| PU |
Physical Unit |
| PULSAR |
Pulsed Sequential Access Relay |
| PV |
PhotoVoltaic |
| PVC |
Permanent Virtual Circuit |
| PVT |
Performance Verification Test |
| pW0p |
Decibels with respect to a test tone of 1mW |
| PWM |
Pulse Width Modulation |
