REMOTE CONTROLLED LINE CONCENTRATOR 



259 



Fig. 6 — Line unit construction. 



concentrator only in response to a pulse in the associated time slot or 

 when a crosspoint operates (a line busy pulse is generated under this 

 condition as a crosspoint closure check). The control circuit in the 

 central office is designed to serve 10 remote line concentrators connected 

 to a single line link frame. In this way the marker deals with a concen- 

 trator line link frame as it would with a regular line link frame and the 

 marker modifications are minimized. 



The traffic loading of the concentrator is accomplished by fixing the 



