2.3.           149

          
(NRZ),        
.

       ,  -
         -
.      Ethernet  Token Ring.

      NRZ   -
 ,    . 
 :

        (  4/5);

    (  2B1Q).

       ,  -
,       , 
 FDDI, Fast Ethernet, Gigabit Ethernet.

2.3.   
 

     ,   -
  ,  ,     -
  .      
    ,     
    ,      . -
     ,    
 ,  ,         -
   ,     Ethernet 
    Ethernet  Token Ring  , -
    .     
           -
   -   .   -
        ,   
    ,    
       .

        
-  ,     
    .       -
 ,        -
    ,     
,   ,    -
 .

      ,   
 Ethernet   ,    -
   ,       Ethernet  .25,