DC Port

Good day

I need guidance with the DC port connection. It shows -48v positive. Would it be the same if I use a standard 48v psu and swop the negative and positive to give me -48v?

Thank you

Does your "standard" psu have floating outputs? Connect the + terminal to earth ground and connect the - terminal to -48 VDC.

If your "standard" psu's - terminal is connected to ground, it won't work for this application.

I hope this helps!


Here is an answer to the next question you are going to ask: http://archive.digivation.net/2006/08/11/why-telephones-use-negative-forty-eight-volts-dc/