6.5.        579

 ,        
   64 /.

,    ,   -
      Internet ( 
   ).      
Internet    ,    -
,     ADSL,    
       ,   
   .

   *DSL   -
     Internet    -
 ,        .

  ADSL-  . ,     
       DMT,     
 -,     -
,    .  *DSL   
,     .    -
 ADSL   ,  short range  short haul  
        .   
    ,    , 
  ,    ,    ,
     2,048 / (,  
RAD Data Communications).

         -
   Internet      -
.           .
      75- -
            30 /,
         10 /.    -
   .

       Internet
         -
    Internet,   10     8 / 
   80 /,       -
  SONET/SDH  .    Internet, -
 UUCP,    .



      
,      -
 .

         
 ISDN          -
  .

       -
      (RAS),     -