CARD TRANSLATOR FOR NATIONWIDE DIALING 1061 



equipment is directed to make another trial. This usually will be with an 

 alternate decoder and translator so that the call is usually completed 

 with a delay of a little more than one second required for punching the 

 trouble recorder card. The trouble recorder, once it has completed 

 punching a card, is immediately available for recording another failure. 

 The trouble recorder is also available for recording failures of other CSP 

 equipment such as the controllers, senders and markers in a manner 

 similar to that described for the decoder and translators. 



TRANSLATOR TEST 



There are facilities provided on the trouble recorder frame, through 

 keys and connecting relays, for adding and removing cards from the 

 translators. On adding a card, a check can be made to verify the card 

 output to make sure that it is in agreement with the template from which 

 the card was coded. Test calls using all decoders and markers can be 

 made to verify the selection of a trunk in accordance with the routing 

 information on the new card as well as on any card in any translator. 

 These tests can be caused to recycle automatically and to drop a trouble 

 recorder card in case of failure. This feature is useful in isolating in- 

 frequent failures in any of the associated translators, decoder or markers. 

 Facilities are also provided for removing the translator selector unit for 

 periodic inspection and adjustment as may be necessary. Also timing 

 tests can be made from the trouble recorder frame to check the time 

 required for the translator to drop and restore a card. 



To determine if any of the output channel elements of the translator, 

 which includes the photo-transistors, transistor amplifiers and cold 

 cathode tubes, for all the channels, have satisfactory operating margin, 

 means are provided for making a mass test of the channels. This test is 

 made under a controlled voltage (36.5 volts) which is considerably below 

 the worst service condition. In case of a failure of an element under this 

 test, a trouble record card will be dropped which will show, by a punched 

 hole, each element that is operating satisfactorily. This mass test is 

 provided to detect any channel element that is approaching end of 

 life and thereby assures that there is at all times ample operating margins 

 of these important channel elements. 



Portable Test Set 



In addition to the test facilities provided on the trouble recorder frame, 

 there is also a portable test set for the translators as shown in Fig. 16. 

 This test set is connected to the translators by means of multicontact 



