386 



BELL SYSTEM TECHNICAL JOURNAL 



25 

 24 

 23 

 22 

 21 

 20 

 19 



O 16 



^ 13 



U 10 



10 20 30 40 50 60 70 80 90 100 HO 120 130 140 150 



FREQUENCY IN KILOCYCLES PER SECOND 



Fig. 14 — Reflection coefficient at junction between open-wire and toll 

 entrance equipment. 



