P
PABX Private automatic branch exchange
PACS Personal Access Communication System
PAL Phase alternation line, one of two European color TV standards, the other being SECAM
PBS Paging base station
PCM Pulse code moculation
PCS Personal communication service or personal communication system
PES Personal earth station
PDH Plesiochronous digital hierarchy (vis-a-vis SDH)
PF Peaking or peak factor
PHEMT Pseudomorphic high electron mobility (LNA)
PHS Personal handy phone system (Japan)
PLL Phase-lock loop
PM Phase modulation
POCSAG Post Office Code Standardization Advisory
Group (a paging standard)
POTS ''Plain old telephone service''
PRB Primary reference burst
PRBS Pseudorandom binary sequence
PRV Partial response violation
PSTN Public switched telecommunication network pW, pWp Picowatts, picowatts psophometrically weighted
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