CARD TRANSLATOR FOR NATIONWIDE DIALING 1059 



from the third card and finally to 1060 milHseconds for the fourth card 

 routing. 



SIX-DIGIT CARD-TO-RELAY TRANSLATION 



This type of operation is used where the first group of trunks to the 

 destination is of the type that requires test by the marker for selecting 

 an idle trunk. There are alternate routes, however, in which the decoder 

 can determine which group has an idle trunk. In this case the area code 

 card provides information for the selection of the first six-digit card. 

 This card has information for routing the call over the first group of 

 trunks. There are alternate route cards for each subgroup of alternate 

 routes. There may be as many as five alternate routes, each of which 

 may have as many as four sub-groups of 40 trunks each. 



The translation time, assuming the routing is from the first card, is 

 about 550 milliseconds. For routings from any one of the alternate route 

 cards, the time increases to approximately 800 milliseconds. Pretransla- 

 tion and FAT delay time, if any, are not included. 



THREE-DIGIT CARD-TO-RELAY TRANSLATION 



The time required is about 350 milliseconds for routings from the first 

 card and about 580 milliseconds for routing from an alternate route card. 



SIX-DIGIT RELAY-TO-RELAY TRANSLATION 



This type of operation is used where all of the trunks including the 

 alternate routes are tested by the decoder in determining in which group 

 there is an idle trunk. 



The translation time, assuming the routing is from the first six-digit 

 card, is approximately 575 milliseconds. For routings to succeeding 

 alternate routes the time is approximately 800 milliseconds. 



MAINTENANCE FACILITIES 



Although the card translator and all of its components are designed 

 for relatively long and trouble-free life, adequate testing facilities and 

 maintenance procedures are essential because of the importance of the 

 individual CSP's in nationwide dialing. Adequate guards and methods 

 of procedure have been made available in case of almost any catastrophe 

 that would incapacitate any CSP office. Moreover the complete break- 

 down of a translator or even several of them in a CSP office would not 

 completely stop calls through that office although the call carr3dng 



