REMOTE CONTROLLED LINE CONCENTRATOR 



287 



10. MISCELLANEOUS FEATURES OF TRIAL EQUIPMENT 



There are a number of auxiliary circuits provided with the trial equip- 

 ment to aid in the solutions of problems brought about by the concepts 

 of concentrator service. One of the purposes of the trials was to deter- 

 mine the way in which the various traffic, plant and commercial ad- 



CONCENTRATOR 

 TRUNK SWITCH 



SERVICE OBSERVING 



TEST CONTROL-] 



SIMULATOR 



TRUNK DISCONNECT 

 RELAYS 



CONCENTRATOR 

 CONNECTOR RELAYS 



FRAME RELAY 

 CIRCUITS 



SERVICE DENIAL 



FRAME ELECTRONIC 

 CIRCUITS 



POWER SUPPLY 



LINE CONDITION 

 TESTER 



Fig. 30 — Trial central office equipment. 



