From: heller@deepsoft.com   
      
   At Sat, 21 Jun 2014 23:17:07 -0500 Stephen Sprunk  wrote:   
      
   >   
   > On 21-Jun-14 22:33, hancock4@bbs.cpcn.com wrote:   
   > > On Friday, June 20, 2014 4:45:19 PM UTC-4, mrob...@att.net wrote:   
   > >> Well, 48 V at the exchange. Maybe 5 V by the time it gets all the   
   > >> way out to your off-hook telephone. :)   
   > >   
   > > FWIW, I used a volt meter on my phone line and it was 48 volts.  Of   
   > > course, I live only a mile from the C.O., maybe people further out   
   > > have a lower amount.   
   > >   
   > > I have no idea what the voltage/currents are on VOIP phone lines.   
   >   
   > On the POTS side, both should be the same as a real POTS line.   
   >   
   > On the IP side, it's whatever the relevant IP technology uses, but in   
   > general the longer the wires it's intended to run over, the higher the   
   > voltage (at least at the source) will be.  Most use differential or   
   > alternating signaling so the net current is zero.   
      
   And with fiber optic Internet (eg FTTH), there is no current at all...   
      
   >   
   > S   
   >   
      
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   Robert Heller             -- 978-544-6933 / heller@deepsoft.com   
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