Pulsating Direct Current

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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	psophometer psophometric voltage public data transmission service public land mobile network 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 radiation angle radiation mode radiation pattern radiation scattering