Why telecom power supply has -48V dc power supply?
Negative sign indicates The positive grounded
he negative voltage on the line was better than positive to prevent electro-chemical reactions from destroying the copper cable quickly, if cables get wet
Low enough not to cause serious danger if somebody touches the telephone wires
What is the nominal voltage required in subscriber loop connected to local exchange?
- 48 volts. This -48 volts is required by the copper wires to prevent it from corroded & eluded
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