1060 THE BELL SYSTEM TECHNICAL JOURNAL, SEPTEMBER 1953 



Fig, 14 — A trouble record card is being removed from the perforator and in- 

 formation from a punched card is being entered in the office records. 



capacity of the CSP office or the switching system would be reduced. 

 However, to insure satisfactory operation of the card translators auto- 

 matic trouble recording, test circuits and maintenance methods are 

 provided. 



TROUBLE RECORDER 



In CSP offices, where the card translators are used, the card punching 

 type of trouble recorder will be provided as shown in Fig. 14. In the 

 event of a failure of any translator, the associated decoder circuit will 

 block and time out. This causes the connection of a multiplicity of leads 

 between the trouble recorder and the decoder as well as to the translator. 

 The trouble recorder will then automatically punch and drop a properly 

 designated paper card (Fig. 15) that shows which translator and decoder 

 are in trouble. The state of the various elements of the translator and 

 decoder will also be recorded. In addition, a record is made showing which 

 code bars, pull up and pull down magnets, latches and important relays 

 are operated. Also the important key relays which are operated in the 

 decoder will be shown. The associated sender will be identified as will 

 also the marker if one is connected. Then too, the state of the marker 

 will be recorded. From this trouble record the cause of the failure can, 

 in most cases, be determined. 



When the trouble recorder card has been punched, the associated 



