From: ahk@chinet.com   
      
   Jishnu Mukerji  wrote:   
   >On 6/22/2014 2:14 PM, Adam H. Kerman wrote:   
   >>Jishnu Mukerji  wrote:   
   >>>On 6/21/2014 11:33 PM, 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 my VOIP phone line which is an optical fiber, both voltage and   
   >>>current are zero as far as I can tell :P   
      
   >>>Oh you meant from the modem to the phone? My old POTS phone from AT&T   
   >>>still works so ..... :)   
      
   >>That's hardly the test. Try using a 28.8k modem and let us know if you   
   >>can get it to synch with another modem.   
      
   >What has that got to do with 48v?   
      
   Modems work within narrower limits than what the human ear can interpret   
   as intelligible voice with a telephone instrument. It could be difficult   
   getting the telephone company to repair telephone lines so modems   
   would work, and I'd assume analog output from a digital line wouldn't   
   work. I still use a 500 desk set with one of my digital lines, but   
   there's no way to get a modem to work. It's been a few years since I've   
   had another computer to dial up to.   
      
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