REMOTE CONTROLLED LINE CONCENTRATOR 



253 



Fig. 1 — Reed switch relay. 



central office equipment. To accomplish this signaling and to process the 

 information economically transistors appear most promising. 



Germanium alloy junction transistors were chosen because of their 

 ; improved characteristics, reliability, low power requirements, and mar- 

 gins, particularly when used to operate with relays.^^ Both N-P-N and 

 P-N-P transistors are used. High temperature characteristics are par- 

 ticularly important because of the ambient conditions which obtain on 

 pole mounted equipment. As the trials of this equipment have progressed, 



