CARD TRANSLATOR FOR NATIONWIDE DIALING 1057 



outgoing trunk, the decoder releases the translator. Just prior to this, 

 the decoder operates an automatic restoral relay in the translator, which 

 causes the card to be restored to its normal position in the stack. This 

 takes place by again energizing the pull-up magnet, and, when the cards 

 are again suspended, the latches are operated and the code bars are 

 released, restoring to their normal positions. The card that was down 

 is restored by the code bars to its position in the stack. All the relays in 

 the translator table then release except for a slow releasing relay which 

 remains operated holding the pull-up and latch magnets energized so 

 that a subsequent call does not have to wait for these magnets to operate 

 and suspend the cards. This feature saves time under heavy traffic. 



TRANSLATION TIME 



The call carrying capacity of a translator and the number of trans- 

 lators for a particular CSP is directly related to the time required for 

 translation, that is, the selection, reading and restoral of the translator 

 cards. For this reason, particular attention to translation time was used 

 in the design, not only of the translator, but throughout all the associated 

 circuits of the switching system. 



Since the translators in service are always controlled by the decoder 

 circuits and since the number of decoder translators and decoder foreign 

 area (DFA) translators are directly proportional to the number of de- 

 coders, the times for the various types of translation and alternate 

 routing will be given in terms of the holding time of the decoder. 



PRETRANSLATION 



This requires approximately 235 milliseconds. On this type of call 

 translation of three digits, when either four, five or six digits are needed 

 for the routing, informs the sender to release the decoder and wait for 

 the rest of the code. 



THREE DIGIT TRANSLATION 



The time for this type of call is approximately 330 milliseconds. This 

 is when three digits are sufficient for a routing. 



SIX DIGIT TRANSLATION 



The time for this is approximately 550 milliseconds, assuming that 

 the six-digit card is in the decoder translator. This does not include the 



