A study of the dimensioning of fiber optics transmitting media in the long distance national networks

The application of the interurban networks dynamical optimization (ODRI) computing procedure is illustrated. The ODRI procedure is formed by two consecutive programs: the CAPDIN program determines the routing of existing circuit-demand between each pair of nodes for the duration of the planning, while the COMB program determines the installation sequence which satisfies each capacity demand at the minimum total cost. The problem under consideration is the planning of an interurban network cabled with optical fibers which would route 66% of the circuit increased demand from 1980 to 2020. The rate of annual increase is taken as between 4% and 8%. The cable cost is found to be two to three times that of the system. The use of cables with a limited number of fibers and systems with high capacity show definite advantages.