Pulse-address Multiple Access

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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 pulsating direct current pulse 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 radio equipment radio fix