Protected Distribution System

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polarential telegraph system polarization polarization maintaining optical fiber polling power budget power factor 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 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 address multiple access pulse amplitude pulse code modulation pulse duration pulse link repeater pumping push to talk operation