464     6   

 HSSI (High-Speed Serial Interface)     -
 DCE,    ,    
(45 /), SONET -1 (52 /).     
        300 /  52 /.

6.1.2.   

  . 6.2       -
        . -
          
  ,     ,   
   .     -
        2-3  ,   
 ,     .

        -
       ,  -
,   . 6.2,      
 .

         -
       .     -
     ,  
   ,    .
        -
   ,     
 .

   ,      , 
  ,   :

  ;

  ;

  .

     ,   
      ,  
    .     
 ,        
   .

 

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

     .   
       , -
 frame relay,        -
 ,    , 
 ,   . 6.2.