Techniques for the synthesis of domestic longhaul communication systems to meet forecast traffic requirements must provide for cost-effective integration of satellites with existing and new terrestrial systems. A methodology that may be uses to carry out this synthesis is described. One of its important features is the separate investigation Of the characteristics of satellite and terrestrial systems with merging of the results towards the end of the study. This allows activities to be carried out concurrently rather than consecutively so that both sets of results may be more up-to-date and so more useful when they are merged. Optimization algorithms are described which are of general interest in that they can be used to optimize any network having step-like link costs.
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