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BELL SYSTEM TECHNICAL JOURNAL 



Fig. 2 — Typical sections of oscillographic records. 



a. Circuit reversals. New York completed talkspurt, heard Chicago's reply, 

 and began another talkspurt. 



b. Reply by New York during pause by Chicago caused lockout. New York 

 gained control of the circuit. 



c. Short reply by Chicago during pause by New York caused lockout. New York 

 regained control of the circuit. 



d. Negative response time. Chicago replied before the completion of New York's 

 talkspurt. 



