why is there -48 v DC voltage use in CISCO Router.?? is there any advatage to

why is there -48 v DC voltage use in CISCO Router.?? is
there any advatage to use this type of negative voltage
rather than positive voltage??

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why is there -48 v DC voltage use in CISCO Router.?? is there any advatage to use this type of neg..

Answer / surya

as we know that normally particles in atmosphere are
negatively charged and & when we use -48V DC it avoid
corrosion of cables that might increase the life of cable

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