Method for monitoring a transmission system which comprises a plurality

Abstract

For monitoring a transmission system comprising a number of asynchronously operating channels through which data cells can be transmitted, variable values are stored which, on arrival of a data cell, are altered by an alteration algorithm in accordance with data cell traffic and are then processed by an evaluation algorithm to produce an evaluation signal. Such evaluation signals are processed by a combination algorithm to produce a control signal. A data cell is or is not, transmitted, depending on the value of the control signal. Quality classes are assigned to the data cells and for each quality class a first variable value is stored, which is altered by a first alteration algorithm when a data cell arrives at a first location and is processed by a first evaluation algorithm to produce a first evaluation signal. The channels are divided into groups, each comprising those channels which use a particular potential congestion point in the transmission system. For each group of channels a second variable value is stored, which is altered by a second alteration algorithm when a data cell arrives at a second location and is then processed by a second evaluation algorithm to produce a second evaluation signal. Depending on the value of the second evaluation signal and depending on the value of the respective quality class, the first alteration algorithm or the first evaluation algorithm or both are so controlled that the number of data cells transmitted is reduced and this the more for data cells of lower the quality classes.