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THE BELL SYSTEM TECHNTCAL JOURNAL, MARCH 1057 



The equipment described here is equally adaptable to central office 

 mounting and pole mounting at remote locations. At the remote loca- 

 tions, however, it is necessary to provide the equipment with an outer 

 housing which gives protection from all kinds of weather and even from 

 moisture condensation. The opened housing is shown in Fig. 19. Fig. 20 

 shows a typical remote mounting of the housing on the left. In previous 

 electron tube carrier systems the amount of heat generated by the equip- 

 ment itself was sufficient to pre\'ent moisture condensation. In the case 



Fig. 20 — Example of remote mounting of PI terminal and ac power supply. 



