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Telecom Power
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telecom power supplies?
Why positive polarity is earthed and negative polarity is used in telecom DC power supplies.
Are you sure ?. In sixties,PNP transistor is more popular than NPN one. At that time the positive of battery is connected to the ground. I believe it is not valid now.
Telecom Backup Power - ElectraGen ME Fuel Cell System by IdaTech
or perhaps