6.5.        567

 ,      -
    CIR     .

  frame relay      -
       -
,    ,     ,
      .

    frame relay    -
  ,      -
     .

        -
    ,  
 frame relay.

      ,   -
  :      CBR, -
       ,   
  VBR,    ,   
    .

           -
       -
 PCR,    SCR,   MBS,  
      , -
  ,   .

          ,
  .      -
    SONET/SDH  PDH.

^          ,
        
     B-ISDN,     ISDN.

6.5.  

         -
       -
,         
 .       -
   ,  ,     -
  .

6.5.1.    
  

     ,     
    ,   .  -