CARD TRANSLATOR FOR NATIOKWIDE DIALING 1047 



By enlarging these holes in combinations the output information for the 

 particular route is obtained. 



As seen in Fig. 4 the top holes beginning at the left of the card are 

 used for ''pretranslation" purposes. The senders are not provided with 

 facilities which enable them to predetermine when to present for trans- 

 lation the first three digits received or when to wait for more than this 

 number as when six-digit translation is required. Therefore the sender 

 always requests translation when the first three digits are received. 

 So for six-digit calls, the sender must be informed to disconnect from 

 the translator after three digits have been received and wait for six 

 digits. The CA6, (come again six) hole in the card is used for this pur- 

 pose. The CA4 and CA5 holes are used similarly for calls to certain 

 four- or five-digit operator codes, informing the sender to apply again 

 for translation T\4th four or five digits. The NCA (No Come Again) hole 

 is used for three-digit calls. 



The "OGT" holes are used to inform the common control equipment 

 on which train of s^\dtches the outgoing trunk appears to enable 

 the associated circuits to select the proper switching train. The remain- 

 ing holes on the top line are for controUing operation of traffic meters. 



On the second line, the translator box number holes are used on 

 area code cards to indicate which translator contains the particular 

 cards for the called area when six-digit translation is required. The INDI 

 hole on the second line and the IND2 hole on the fourth line which 

 commonly are referred to as index holes are never enlarged. They serve 

 as an indication that a card has dropped and that all is ready for trans- 

 lation output detection. These index holes also aid in trouble detection 

 in case of light failure, for routing of certain calls where cards are de- 

 liberately omitted and for calls where a blank code was dialed in error. 



The class holes are used for indicating the type of outpulsing and the 

 kind of signalling channels used on trunk groups out of the office. 



The AREA CODE CONTROL holes on the third line are used for deter- 

 mining the number of digits to be transmitted forward to the next office 

 and for supplying undialed code digits needed primarily in connection 

 with automatic alternate routing. The alternate route pattern 

 NUMBER holes are used for the selection of the series of alternate routes 

 to be used. 



The holes on the fourth line are for making proper disposition of calls 

 when all trunks are busy and to inform the associated circuits how many 

 digits should be received for the particular code. 



The CODE CONVERSION holes on the fifth line are used to supply the 

 sender with information as to the outpulsing of certain arbitrary digits 



