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摘要

PURPOSE: To efficiently attain data communication by reducing, delaying, or stopping the in-flow of data cells to the specific point (bottle neck) of a communication equipment in the case of the presence of fear that the number of data cells is too many at this concentrated point, and crowding is generated at that point. CONSTITUTION: What is the maximum load in which all data cells attaching to each group are concentrated through a potential crowding point (bottle neck) is already introduced to the evaluation algorithm of a first evaluation unit 5a. Feedback signals t1-t3 estimated from a first evaluation signal are provided to evaluation units 5b-5d, and an evaluation signal is generated based on a quality class for disturbing that. The evaluation algorithm of the evaluation unit 5d is changed according to the minimum quality class III by using this first evaluation signal That, is the threshold value of the data cell having the minimum quality class III is increased, and as a result, such kind of data cells can be inhibited from being transmitted to a downstream device of permitted only in an extremely limited range. Thus, data communication can be efficiently attained.