THEORIES FOR TOLL TRAFFIC ENGINEERING IN THE U. S. A. 469 



Table IV — Loss Comparison of Graded Arrangements 



Table V — Comparison of Theory and Throwdowns for the 



Parameters of Loads Overflowing the Common Trunks 



in Single-Stage Graded Multiples 



In Table V are given certain descriptive data for the 17 OST trunk 

 arrangements showing numbers of legs of direct trunks, total direct 

 trunks, the offered erlangs and calls, and the mean and variance of the 

 alternate routes' overfiovvs, as obtained by the ER theory and by 

 throwdowns.* The throwdown a' and v' values of the OST overflow 



* Additional details of this simulation study are given in Section 7.4. 



