Our exchange is under Stored Program Control (SPC). This means that there
   is a computer in the system whose job is controlled by a program (in reality,
   several programs).  The control functions involves in ....

   Detecting and analyzing events in the exchange
   Deciding on suitable measures (choosing the program)
   Take action (e.g. control the set of the call )
 
 

   Figure 31 shows the SPC operation in an exchange.
 
 

 

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