Why -48V is used as power for telecom? This topic has 16 replies, 1 voice, and was last updated 6 years, 1 month ago by osama. Viewing 2 posts - 16 through 17 (of 17 total) ← 1 2 Author Posts 20th October 2018 at 05:36 #37770 Arham AshaqGuest i want to know that why we only prefer -48 volts in telecommunication devices 6th December 2018 at 08:05 #37771 osamaGuest Why -48V is used as power for telecom Author Posts Viewing 2 posts - 16 through 17 (of 17 total) ← 1 2 The forum ‘Telecom Design’ is closed to new topics and replies.