Psophometer

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power failure transfer power law index profile power margin precision preemphasis preemphasis improvement preemphasis network preventive maintenance primary channel primary rate interface primary station	primary time standard principal clock priority priority level private line proceed to select propagation constant propagation path obstruction proration protected distribution system protocol control information	protocol data unit provisioning pseudorandom noise pseudorandom number sequence psophometric voltage public data transmission service public land mobile network pulsating direct current pulse pulse address multiple access pulse amplitude	pulse code modulation pulse duration pulse link repeater pumping push to talk operation push to type operation quadrature quadruply clad fiber quality control quasi analog signal queuing delay