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Why -48v dc used in telecom equipment regent for ansar?

Updated: 8/21/2019
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10y ago

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This voltage is supplied by large banks of lead-acid batteries at the central office. There are 24 cells in each battery, giving 48 volts. Grounding the positive battery terminal makes the delivered voltage negative. Batteries are used so the system can keep operating (for a period of time) during a power failure, so that emergency and other important calls can still be made.

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Q: Why -48v dc used in telecom equipment regent for ansar?
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