DIALING HABITS OF TELEPHONE CUSTOMERS 



37 



rcspoiuLs to Figs. 2(a) and 2(h). Fig. (i is for the coin class of service 

 with 34 line finders and corresponds to Figs. 2(c) and 2(d). 



Plotted on Figs. 3 to 6 are theoretical fitting dial tone tester delay- 

 curves, curves A, determined by meai'is of the following formulae: 



1. The generalized trunking formula for determining the proportion 

 of calls that encounter congestion, i.e., find all line finders busy. 



i < 



,H .2 



z 



m 



5 



AV13a 3NOI IVia aSlVDIQNI 3Hi NVHi a3iV3a3 

 SAV-13a a3H31NnOON3 iVHi SIIVD iS3i 3NOi IVIQ dO iN30 a3d 



