 
 Where is
 pointer processing needed?
 SDH
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
  
  
 
  
  
   
   
   
   
   
   
   
  
  
  
   
  
 
  
  
 
  
  
 
  
  
 
  
  
  
  
 SDH
 CC
 ATM
 ATM
 SDH
 SDH
 CC
 Pointer processing is
 needed when different SDH network nodes have slightly different clock rates
 VC-4 container passes transparently
 through SDH
 cross-connect (CC) equipment 
 
  
  
  
  
 
  
  
  
  
 
 Packing of 
 VC-4 container
  
 
  
  
 
  
  
  
 
  
  
  
  
 Mux/demux SDH node
 ATM switch
 
  
 
  
  
  
 