6.5.       571

  40     ,  60-80,  -
      frame relay. 
,     ,    
,      .   -
        -
   frame relay.

6.5.2.    

         
           -
,     .        -
       (Remote Access Server,
RAS),        -
  .    ,  
   ,     .

,          
   ,       
        ,    
. ,      
(   ), ,  ,     
,        ( -
),   .

        
    (Communication Server). -
        ,
       -
  /,     .
,       -
,            , 
         .
 ,     
,     . ,  -
    dial-out  ,   -
         
  -  .

   (Remote Access Server, RAS)   -
,   ,      
  ,   . .  .    -
  dial-in  ,   ,   -
 ,        .
       .   
        
     .

        
   ,      -
    -  ,    