ELECTRONICS IN TELEPHONE SWITCHING SYSTEMS 



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In the control portion of a switching system it is not only necessary 

 to gather and store information but it must be interpreted and appro- 

 priate action taken. This function is called "processing". Processing 

 circuits control the information gathering and storage functions and 

 perform logical functions to produce the necessary flow of information. 

 In the logic circuits of electronic systems, to keep pace with the time 

 sharing nature of the information gathering function, the devices used 

 must be several orders of magnitude faster than their counterparts, the 

 relays, of the electromechanical system. The scanning and bulk memory 



Fig. 19 — Electrostatic storage tube. 



