. The Bell System technical journal . THEORY OBSD AVG VAR ^NEGATIVE BINOMIAL 0 5 10 15 20 25 30 35 n=NUMBER OF SIMULTANEOUS CALLS P^n _^^RANDOM TRAFFIC--NEGATIVE BINOMIAL. THROWDOWN 0 5 10 15 20 25 30 35 n = NUMBER OF SIMULTANEOUS CALLS Fig. 34 — Distribution of calls from crossbar tandem trunks; negative binomialtheory versus throwdown observations. ! THEORIES FOR TOLL TRAFFIC ENGINEERING IN THE U. S. A. 479 of siniiiltaneoiis calls. The agreement again is reasonably good, in spiteof the considerable disparity in variances. The overflow from XBT and the load which by-pas
. The Bell System technical journal . THEORY OBSD AVG VAR ^NEGATIVE BINOMIAL 0 5 10 15 20 25 30 35 n=NUMBER OF SIMULTANEOUS CALLS P^n _^^RANDOM TRAFFIC--NEGATIVE BINOMIAL. THROWDOWN 0 5 10 15 20 25 30 35 n = NUMBER OF SIMULTANEOUS CALLS Fig. 34 — Distribution of calls from crossbar tandem trunks; negative binomialtheory versus throwdown observations. ! THEORIES FOR TOLL TRAFFIC ENGINEERING IN THE U. S. A. 479 of siniiiltaneoiis calls. The agreement again is reasonably good, in spiteof the considerable disparity in variances. The overflow from XBT and the load which by-passed it, as well assome other miscellaneous parcels of traffic, were now combined for finaloffer to the Suburban Tandem group of 17 trunks. The comparison ofparameters here is again available in Table XI. On Fig. 35 are shownthe observed and calculated distributions of simultaneous calls for theload offered to the ST trunks. The agreement is once again seen to bevery satisfactory. We now estimate the loss from the ST trunks for comparison with theactual proportion of calls which failed to find an idle path, and finally Table XI — Load Offered to Suburban Tandem The
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