248     3     

    Ethernet 10 /,  802.3   
     .      -
       .  -
    ,    , 
    ,   .  , -
,   ,   ,  
      512   (bt), 
        .

   I      -
 .

,     ,  
  . 3.10,      -
  .

 3.10. ,  

 	   bt  1 	     
UTP Cat 3	1,14 bt	114 bt (100 )
UTP Cat 4	1,14 bt	114 bt (100 )
UTP Cat 5	1,112 bt	111,2 bt (100 )
STP	1,112 bt	111,2 bt (100 )
	1,0 bt	412 bt (412 )

,       
 (  ),   . 3.11.

 3.11. ,   

            

  TX/FX           100 bt
  4              138 bt

  TX/FX          127 bt
  4

,   ,    I,  140 bt,
        ,
,       -
,   . 3.10.     512, ,
      .  802.3
    4 bt    ,  
      0  5 bt.

       , -
         
136 .

     136 bt,    FX 
  100 bt,       140 bt.  
 512 bt,    ,   ,     0.