Compact sliding-window ATM service quality monitoring apparatus

摘要

An ATM (Asynchronous Transfer Mode) service monitoring apparatus includes a first counter unit (1, 2), a window set counter (3), a plurality of second counters (51 ∼ 5N) of the N, and a judging section (6). The first counter unit (1, 2) counts the first number of times a cell is passed and generates a first reset signal (19) to clear the first number when the first number reaches a value obtained by dividing Z (Z is a positive integer) by N (N is a positive integer). The window set counter (3) inputs the first reset signal (19) to count the second number of times the first reset signal (19) is inputted. Each of the plurality of second counters (51 ∼ 5N) counts the third number of times a cell is disposed of and one of the plurality of second counters (51 ∼ 5N) is reset when the second number is changed. The judging section (6) judges an ATM service quality based on the third numbers of the plurality of second counters (51 ∼ 5N).