re: satisfied customer

["W. Curtiss Priest" <BMSLIB@MITVMA.MIT.EDU>]

  Matthew Sparby said, regarding ISDN:
  >It doesn't do any modulation at all
  
  My communication theory is rusty, but I thought that certain phase shift
  encoding schemes were inherently more noise immune and better reached
  toward the theoretical limits of the bandwidth available than simply
  sending a "digital signal" (a simple rise and fall in voltage on a
  wire).
  
  Is this true of ISDN that if I took a scope and looked at the
  PC bus where the digital signal was passing, and then looked on the
  ISDN line, I would see the same, identical wave form?
  
              W. Curtiss Priest, Director, CITS
        Center for Information, Technology & Society
           466 Pleasant St., Melrose, MA  02176
         Voice: 617-662-4044  BMSLIB@MITVMA.MIT.EDU
   Fax: 617-662-6882 WWW: http://www.eff.org/pub/Groups/CITS