MONITOR SYSTEM FOR TRANSMISSION NETWORK

PURPOSE:To realize the monitor of an ATM transmission network able to measure a cell flow without increasing the circuit scale by providing an input/ output section, a timer, a memory and a traffic measuring section to the system. CONSTITUTION:An initial value for the entire device is set to an input output section 1. A traffic measurement section 4 continues the measurement when a preceding cell arrival time and arrival time interval in the memory 3 are not a lower limit at the arrival of a succeeding cell of a same identifier. The measurement is a gain implemented when the measurement allowable time is exceeded and the result is not outputted from the input output section 1. Thus, even when number of identifiers is increased, the system copes with it by having only to increase the capacity of the memory 3, the circuit scale is not affected and no error measurement result is outputted. When the arrival time interval between cells of the same identifier is less than the lower limit, number of times of violation is accumulated to the memory 3, the number of times of violation and its identifier are outputted from the input output section 1 at the end of the measurement to inform the time interval of the violation cell. Thus, the cell flow is accurately given.