236     3     

     :    -
 PHY (Physical)      PMD (Physical Media
Dependent) (. . 3.17).

 FDDI       PMD: 
-        5.
        TP-PMD.

  PMD     -
         .  -
 :

        -
-  62,5/125 ;

         
 .       
      2 ,    
   10-40      ;

      (optical bypass switches) 
 ;

    MIC (Media Interface Connector),  -
;

         1300 ;

          NRZI.

 TP-PMD      -
          MLT-3,
   : +V  -V     -
.          -
    .   
     TP-PMD  100 .

    FDDI  100 , -
         500.

3.5.5.  FDDI   Ethernet
 Token Ring

 . 3.7     FDDI  
Ethernet  Token Ring.

 3.7.   FDDI, Ethernet, Token Ring

	FDDI	Ethernet	Token Ring
 	100 /	10 /	16 /
	  	/	/
 	    	CSMA/CD	  