DELAYED EXPONENTIAL CALLS SERVED IN RANDOM ORDER 377 



0.1 

 8 



6 



5 ^ 



Q 



O 2 



=! 0.01 

 < 8 



O ^ 



0.001 

 8 



6 

 4 



10 



0123456739 

 t/h = DELAY IN MULTIPLES OF AVERAGE HOLDING TIME 



Fig. 15 — Delayed traffic served in random order, exponential holding times, 



delay on all calls to 0.035 (100) = 3.5 seconds, an improvement in this 

 characteristic of 7 to 1 over the 8 operator service.* 



Example No. 4 



How much improvement in the delay service would be obtained in 

 Examples 2 and 3 by purchasing storing or gating equipment which 

 would substantially insure calls being handled in order of arrival? 



Solution. With 8 operators working at an occupancy of 0.78, the pro- 



* Had some number of operators been required other than those for which 

 working charts, Figs. 8 to 18, are supplied, intermediate values could be obtained 

 by graphical interpolation, or better still by employing the basic Riordan chart. 

 Fig. 20, combined with P(>0) found on Fig. 21, to obtain delay versus load for 

 any desired number of paths or facilities. This latter process is described in the 

 Appendix. 



