6.2.            481

   ,     
 ,   :

        -
,   (add)   (drop)  -
   ,    ;

   ;

         ;

         -
 .

       SONET/SDH -
  . 6.7.

                                                             

 (Path)		
	 STSn			
 (Line)				
			^		>	
 (Section)						
					>	
  (Photonic)						
			>		>	

()    ()





	STSn							
								
					R			
						'		






/
(add-drop)



. 6.7.      SONET/SDH

  ,       SONET/
SDH.

   (Terminal, ),    -
 (Service Adapter, SA),     -
   PDH ( 1/1  /)    
 STS-n. (  STS-n    
  SONET/SDH.)

  (Muliplexers)     
      STS-n    -
  STS-m.

  ^-^ (Add-Drop Multiplexers)    -
     STS-n,   
 ,   ,  , -
   .