THROWDOWN MACHINE FOR TRAFFIC STUDIES 



339 



register originations, the operator controls the preference with the assis- 

 tance of a lamp signal per connector and a written register preference 

 record. 



Once in the active section of the gate, a call awaits an idle marker. 

 When correct preference conditions are met, a conn closed (c) lamp 

 lights, together with an attention lamp, to indicate to the marker opera- 

 tor which is the next call to be served. The marker operator depresses 

 the MKR PREF key in the connector block to lock in a signal at the marker 

 position indicating the marker to be used on this call. The operator 

 then removes the call sUp and peg from the gate and inserts them in the 

 correct unit of the marker position. The match ticket portion of the 

 call slip is torn off and passed to the match operator. On originating 

 register controlled calls, the register match ticket will have been at- 

 tached to the call slip and this also is passed to the match operator. 



MARKER 



CONNECTOR ARRAY 



SENDER GROUP 

 CONNECTOR 



SENDER HOLD 

 JACKS 



SENDER PEGS 



« o & o « 



I II li 11 H II H ll » n t 



MARKER UNIT 



Fig. 19 — ^Marker position. 



