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why -48volt dc is used in telecommunication?
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The reason is so that telephones can work during a blackout. The power comes from batteries at the telephone center. The high voltage can work for a long distance, because current is small..
This is the right answer.-48V was chosen to prevent corrosion and is the highest voltage that can be used that will not pass a fatal level of current though the human heart.
This is the right answer.
With a negative voltage {with respect to ground) any electrolytic action (ion migration) will be from the surroundings to the wire.
But one side of the system (positive side) is always at or very near ground potential.