DIALIXG HABITS OF TKLKI'IIOXK CISTOMERS 



Z(J to 



LU Z 



0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 



TIME, t, IN SECONDS AFTER THE RECEIPT OF DIAL TONE 



Fig. 23 — Distributions of the start-to-dial times of subscribers wlio dial after 

 the receipt of dial tone. 



iiulicate that a strong similarity exists among the six types of subscribers 

 with regard to their dialing patterns once dial tone is received. 



Fig. 23 shows composite dialing distributions of the six types of sub- 

 scribers for four dial tone delay intervals. For dial tone delays less than 

 3 seconds the dialing patterns are seen to be similar. Beyond 3 seconds 

 delay the start-to-dial curve shifts outward, although the data are too 

 scattered to indicate closely where the movement begins. 



COXCLUSION 



The foregoing report of the results of the tests conducted at the 

 Sterling-3 central office indicates that the dialing habits of subscribers 

 waiting for dial tone can be observed and analyzed to develop so-called 

 J factors for use in a more general trunking formula than has been 

 employed until recently in the Bell System. The report also presents 

 descriptive data regarding the patterns subscribers follow when waiting 

 for dial tone. 



ACKXOWLEDGEMEXT 



The writers gratefully acknowledge the help given by the personnel 

 of the Long Island Area of the New York Telephone Companj^, by 

 their associates and others in the various phases of the study and par- 

 ticularly b}' C F. Bischoff who had a major pai't in conducting the tests. 



