Public Data Transmission Service

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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 psophometer psophometric voltage 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 radiation angle radiation mode