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Why -48V?

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How do you expect to receive an answer form a question that cannot be understood?
 
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**broken link removed**

Look at Note #4 at the bottom of the page.

BTW, I think he's speaking Tagalog (Philipino)
 
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If I get what you are asking, telephone lines use 48 V because is in the limit considered safe for handling (low voltage) and negative because that way reduces electrolytic erosion of copper wires often wet when underground or rains.
 
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