Investigation of the multipurpose loss calculation algorithm for Integrated Services Digital Network (ISDN) management system

摘要

An algorithm has been developed for calculating the loss in a subscriber line in order to determine whether ISDN can be provided over the line. The line loss is the main factor determining whether ISDN can be provided. This algorithm can calculate the loss in a complicated subscriber line with several bridged taps. It is based on 1) the theoretical calculation of the loss in a four-pole network, 2) programming with recursive calls, and 3) the definition of the attributes of the subscriber-line facilities as a matrix. This algorithm has been used successfully in the ISDN management system at NTT's Saitama branch since December 1998.