6.4.            539

  frame relay

 frame relay     ,  -
  .25.      -
^,       .25,     frame
relay.

 frame relay       -
    ,       Ethernet.
  ,        -
,       ,  .
   ,   frame realay,    Ethernet,  -
     .     
        
frame relay         
  ,    frame relay.   -
,       ,    -
   TCP  NCP   .  
    ,      
frame relay     ,      Ethernet 
   .

  frame relay       -
  -   .  -
      ,     G.703  
 ISDN.       
         "6.

    frame relay   ,    -
,        .  -
      frame realy    
   2 /,      .

        frame relay -
  .      -
 ,   , .  
frame relay       .  , -
,   frame relay,     ,  -
.        ,   
    .

        
         , -
         ,  
 ,      , -
  .

        frame
relay   FRF.11.        
 ,      ^~~~ ~

.     frame relay   -
     ,   -
 ,        1/1, 
    .