ELECTRONICS IN TELEPHONE SAVITCHING SYSTEMS 



1007 





iiFi<i:mM^^'&'^-'m. 





Fig. 16 — Wiring side of relay unit. 



longed intervals of loss of power. The amount of memory is measured 

 in terms of binary digits or "bits". The number of bits equivalent to 

 single cross connection can be rather large. Therefore, electronic mem- 

 ory replacing fixed memory such as in the card translator in modern 

 electromechanical systems should be high in bit capacity, from 10^ to 

 10^ bits for 10,000 lines. 



Fig. 17 — Magnetic drum. 



