Why -48V are given to BTS and not +48V?

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Abdul Manan

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why 48v

Can anyone tell me the reason that why negative 48V are given to BTS and not positive 48V
 

Re: why 48v

negative supply is more immune to noise
 

I would imagine it has to do with corrosion, if the return is truly at ground
(earth) potential and the signal negative, the signal will not corrode with
-48V but would be chowed quickly with +48V and any moisture at all.
 

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