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Fig. 9.4. Characteristic traffic for high usage route with overflow.

Fig. 9.4 (a) shows the traffic offered to high usage route. The traffic carried by the high usage routes are shown in Fig. 9.4 (b). Fig. 9.4 (b) depicts that the traffic carried is equal to the traffic offered, if it is less than or equal to number of high usage trunks. If the offered traffic is greater than the number of high usage routes, overflow occurs and the traffic carried equal to number of trunks.

Fig. 9.4 (c) shows the over flow traffic. The traffic offered to the final route is thus more peakly than poisonian traffic. The analysis of this traffic requires mean as well as variance. The Wilkinson equivalent Random theory is the widely used method to analyse the random overflow traffic.

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