XPost: sci.electronics.design   
   From: jasen@xnet.co.nz   
      
   On 2010-03-10, Jon  wrote:   
      
   > What?  Have you deviants flipped your lid?  Knowledge is free.  But just try   
   > to get your hands on telephone electronics.  It's proprietary information.   
   > There are no books on it at the library.   
      
   The info is out there if you keep looking.   
      
   > All they show is how the keypad makes beeps.  The rest is secret.   
      
   > How do you multiplex 4 dedicated lines through one wire?   
      
   These days, VOIP. in the past some sort of FDM.   
      
   > What's the code?  But knowledge is free, and nobody's   
   > going to get electrocuted with phone line voltage.   
      
   The lowest voltage fatal electric shock that I am aware of was 42V   
   telephone on-hook volage is 48V, ring voltage is even highrer.   
      
   bye.   
      
      
      
      
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