INTEKTOLL TRUNK CONCENTRATING EQUIPMENT 



325 



the next idle trunk lights. Tlie lump does not necessarily move progres- 

 sively thru the group hut is al\va3's lighted on the lowest numl)ered idle 

 trunk in the group. 



The diriM't iiileiloU trunks and the trunks to a concentrating equip- 



DIRECT CIRCUIT 



TRUNKS TO 

 CONCENTRATING EQUIPMENT 



IDLE INDICATING 

 LAMPS 



GROUP CONTAINING TRUNKS 



CI CI CI CI TO CONCENTRATING 

 C^ C^ C) C EQUIPMENT ONL 



GROUP CONTAINING DIRECT 



--SUBGROUP—. TRUNKS AND TRUNKS TO 

 D CI CI CI SINGLE CONCENTRATING 



OOOO OOOO ^°^^'^^^' 



SUBGROUP^ 

 D CI CI CI 



GROUP 



D = DIRECT CIRCUIT 



TRUNKS TO 



CONCENTRATING 



EQUIPMENT: 



CI =FIRST 



C2=SECOND 



C3=THlRD 



GROUP CONTAINING DIRECT 



/-SUBGROUP-. ^SUBGROUP-. TRUNKS AND TRUNKS TO 

 D CI C2 C3 D CI C2 C3 THREE CONCENTRATING 



OOOO OOOO ^°^'^^^^^ 



Fig. 13 — Idle trunk indicating control and some examples of groups contain- 

 ing direct trunks and trunks to concentrating equipment. 



