... ordi-nary and priority queueing systems. An alternate and instructive way to view78 QUEUEING THEORY FOR TELECOMMUNICATIONSthe busy-period process is to separate the busy period into two parts: the ... service with rateCustomers who decide not to enter the second service system proceed immedi-ately to the third system, which has service rate There, they join the waitingline along with customers ... into (3.26), we find thatUsing the fact that and each have the same distribution as in (3.27)leads to We showed earlier that and Substi-tuting these values into (3.28) leads to 80 QUEUEING THEORY...