1338 THE BELL SYSTEM TECHNICAL JOURNAL, NOVEMBER 1954 



records that number in the sender by the operation of numerical keys 

 located at her position. The CAMA switchboard shown in Fig. 5 is a 

 cordless board of modern sheet metal design. 



The sixth group of functions ■ — that of converting the data into the 

 desired form and perforating it on the paper tape — is performed jointly 

 l)y the transv^erter, the billing indexer, the recorder and the call identity 

 indexer. The trans\'erter is very similar to that used in local A]\IA. It 

 registers the calling and called nimiber received from the sender, registers 

 the billing data received from the billing indexer and controls the re- 

 corder in the perforation of the initial entry. 



The billing indexer is strictly a translating circuit. It receives the 

 calling and called office codes and the customer rate class from the trans- 

 verter and converts this information into a form which the transvertei 

 and recorder can use. It provides a 1-digit billing index, which denotes 

 the charging plan to be used, and provides a type of initial entry indica- 



A LINK 



SENDER 

 GROUP 3 -- 



SENDER 

 GROUP _""_ 



POSITION 

 _^_ GROUP 9 



POSITION 



_0_ GROUP 5 



POSITION 

 _M_ GROUP 4 



POSITION 

 GROUP 



CONTROL 

 B 



Fig. 4 — Position link and control circuit. 



