THE OCCURRENCE AND EFFECT OF LOCKOUT 

 TABLE I (Continued) 



265 



Notes 



The values of delay in the column headed Tw include the delay of the tie line 

 and the added artificial delay. 



Circuit ib arranged with relays he and hy, to short the echo suppressor without 

 shorting the transmission path. 



nation. Observations were also made from time to time on the tie line 

 without added delay and with a single echo suppressor of special design. 

 Since this condition was not subject to lockout, these observations may 

 be used to give an indication of the seasonal effects, and to correct data 

 obtained from the different groups of tests. These data are designated 

 by the letter n. 



The data recorded consist of the duration of each call, the number of 

 lockouts per call, the total locked out time per call, and the number of 

 repetitions per call. Calls having a duration less than 100 seconds are 

 not included in the data. Table II gives the number of calls observed, 

 the mean duration of the calls in seconds, the number of lockouts per 



