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Why did we use -48 v Dc in telecommunication filed?

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Question added by Rashid Hafeez , Electrical Supervisor HIGH TECH ENG & SERVICES , Project Waird
Date Posted: 2013/12/03
Omer Saeed
by Omer Saeed , GIS Team Lead , Magma Systems

there are many possible reasons..

1. To prevent the outside equipment from lightning, because clouds are negativly charged at bottom. If telecom equipment is positive then clouds will choose antenna to discharge.

2. All telephony and landline equipment and wiring is made up of copper.... to avoid errosion and rusting.. they use negative potential...

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