TELEPHONE EQUIPMENT FOR LONG CABLE CIRCUITS 



U7 



of a group of interrupters with the associated testing equipment. 

 These assembly arrangements are uniform with those previously 

 described for other types ot equipment. 



The 135-cycle motor-generator developed for signaling purposes 

 is shown in Fig. 27. This outfit includes two motor-generators, one 

 for regular service and one for reserve, on one panel, the control 



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-Assembly of 10-Watt, 135-Cycle Motor-Generator Set and Associated 

 Apparatus 



equipment being mounted on a second panel. The output ot the 

 motor-generator, which is provided with a filter, is practically free 

 from harmonics. Its voltage range is from 30 to 40, while its fre- 

 quency range is from 133 to 137 cycles, including full load to no load 

 conditions. The output capacity of this machine is approximately 

 10 watts. 



General Assembly Arrangements 



In the preceding descriptions some mention has been made of the 

 panel assembly method which is expected to be used with much of 

 the cable equipment. It might be well to speak briefly here of some 

 of the features of this mounting method which are expected to have 

 general application. 



The large number of equipment units per station in the cable plant 

 has been one of the principal factors in determining the requirements 



