Buffer controller incorporated in asynchronous transfer mode network for changing transmission cell rate depending on duration of congestion

摘要

An asynchronous transfer mode network has a controller (21g/ 21h to 21k/ 21m) for a buffer (21c) where asynchronous transfer mode cells successively enter into a queue formed therein, and the controller determines a degree of congestion status on the basis of the length (Q) of queue and a lapse of time (T1 to Tn-1) after the length exceeds the least threshold of the length so as to change a transmission cell rate.