MAGNETIC DRUM TRANSLATOR FOR TOLL SWITCHING OFFICES 721 



pulses to all translation selecting and translation delivery circuits in mul- 

 tiple. The object of such an arrangement, naturally, is to employ the mag- 

 netic drum system in the most economical manner. A further extension 

 along the same lines would involve relay switching of the pulse circuits 



TRANSLATION SELECTING UNIT 



"n 



MATCH 

 UNIT 

 NO.t 



MATCH 

 UNIT — 

 NO. 8 



I — T — 1 



' I f f I t ♦ T T L 



AND -GATE 



AND -GATE 



AND-GATE 



'A" 



PULSE 



GENERATOR 



-MATCH PULSE 



CBKM 



DISABLE ^~j»j 

 BIAS 



SLOT- 



SPANNING 



MEMORY 



3_J 



AND-GATE 



"B" 



PULSE 



GENERATOR 



CODE CHECK RELAYS 



H 



K> 



X 



T 



I 



I 



I 



INPUT CODE 

 CHECKING 

 NETWORK 



I I 



H 



X 



T 



X 



CBK 



1 



I 



IND B 



^ 



i t 



X 



si 



U. 



DC 



oS 



tr block diagram. 



