AUTOMATIC TOLL SWITCHING SYSTEMS 



878 



Fij£. 4 — Cai'd t fuiishitor- 



the code point and a route relay associated with the trunk group to be 

 selected. The route relay has a number of contacts which are cross- 

 connected to supply the information required for proper routing of the 

 call. When changes in routing or equipment location of trunks within 

 the office are made it is necessary to change cross-connections. 



With the nationwide dialing plan in operation routing changes or 

 opening of new offices in one part of the country will necessitate trans- 

 lator changes in many offices, some of them far removed from the scene 

 of the event that forces them to be made. The changes in any one CSP 

 will, therefore, be frequent and to make them by running cross-connec- 

 tions would be cumbersome and expensive. The new translator uses 

 punched cards instead of relays, making it possible to effect changes by 

 the simple process of removing old cards and inserting new ones in a 

 machine. This can be done in a very short time and not only saves labor 

 but requires less out-of-service time for the equipment. Fig. 4 is a photo- 

 graph of the machine. 



A metal card about 5 by lOf inches is provided for each area code 

 and also one for each office code that must be translated in a particu- 



