6.4.            537

  CIR  .      
   ,     CIR, Be  Be. ,
       1     -
 CIR,  128 /,      
128 /,    1  1,544 /     -
   +.

		CIR = 256 /			
		=512			
		. = 128 			
CIR'	=128 / /			
-=	64  	256  '  	(2) <<	CIR	=512 /
		^S/ / DLCI=136 .-^-^		Be'	 128 
(1	1	(-^:^-::^^^"'	^	,Be=	 64 
		/ '' ~ ~---.-.^"			(5)
		'/.--'	,'		nV-
		^ '"'			
		\. ' /			
		"^--" ---..,			
		^ ^ /			
		/ \ 's '			
		/ \^ ^ / -			
		1 ^^'-^^'^			
	()	\1			
		(4)			

. 6.28.    frame relay

        -
  . ,  . 6.28  1    2
   DLCI=136.     1   2
    128 /   =256  (
  1 )  =64 .       
      256 /  
=512 =128 .

       
        frame relay.
    ,    
      . 
      ,   
      .
          
    DE=1  ,   +.

     frame relay     (-
)   .    
  ,       (
 ).  FECN (Forward Explicit Congestion Bit) 
    .      -.
         (TCP/IP,
SPX  . .)     ,     -
    .