THROWDOWN MACHINE FOR TRAFFIC STUDIES 



335 



NCOMING 



REGISTER 



ARRAY 



NCOMING 

 TRUNK 

 ARRAY 



as follo\Vs: 



Fig. 16 — Originating position — left side. 



HG— LLF— L 



where HG — ^horizontal group No. 0-9 

 LLF— hne link frame No. 00-19 

 L— Hne No. 00-49 

 The right upper five lines in each horizontal group of a frame (lines 

 45-49) are reserved for PBX use. A PBX can be assigned to hne jacks 

 occupying the same relative location in a vertical row (20 line link frames- 

 same horizontal group). The pegs in a PBX group are marked with a 

 distinctive color to facilitate hunting. 



