382 



BELL SYSTEM TECHNICAL JOURNAL 



In order to suppress only a portion of the interaction crosstalk 

 between two. sections, measurements were made with the coaxial 

 outer conductor-sheath circuit shorted at the transposition point thus 

 permitting continuity of the quad-outer conductor tertiary circuit. 

 This tertiary circuit had been shown previously to be an important 



95 



105 



115 



120 



130 



a 140 



Q 



Z 145 



<5 100 



105 

 110 

 115 

 120 

 125 

 130 

 135 

 140 



40 50 60 



100 150 200 300 400 500 600 

 FREQUENCY IN KILOCYCLES PER SECOND 



Fig. 13 — Same as Fig. 12 except with quad-outer conductor tertiary circuit 

 continuous past the transposition. 



one in the production of interaction crosstalk. The measured far-end 

 crosstalk results are given in Fig. 13. 



It is at once apparent that the transposition is not so effective in this 

 case. The crosstalk remaining after transposing is about what would 

 be expected due to interaction crosstalk between sections via the quad- 



