To ensure accurate network design and planning in the presence of multiple streams (arising, e.g. from different services on the same network), it is imperative to determine the individual means and variances of the overflows of the different traffic streams offered to a common trunk group arrangement. The exact calculation of these parameters for the individual overflow streams is a very hard problem. Thus, this Recommendation introduces different approximate methods for the calculation of the individual overflows. These methods are evaluated in terms of accuracy, processing time, memory requirements and programming effort. This Recommendation also provides sample numerical results based on exact calculations to which the results based on these methods may be compared.
ITU-T E.524 FRENCH-1999 Referenced Document
ITU-T E.521-1988 Calculation of the number of circuits in a group carrying overflow traffic
ITU-T E.600-1993 Terms and Definitions of Traffic Engineering - Telephone Network and ISDN - Quality of Service Network Management and Traffic Engineering (Study Group II) 21 pp
ITU-T E.524 FRENCH-1999 history
1999ITU-T E.524 FRENCH-1999 Overflow Approximations for Non-Random Inputs Study Group 2; 18 pp