Patent ID: 6335918
Filing Date: 2002-01-01
Classification: H04L

Abstract:
A device for estimating a loss ratio of data cells in a digital transmission network switch having a router configured to route cells present on incoming highways to outgoing highways through stacks of registers, comprising:a traffic summator configured to provide an output indicating a total number of cells which are present on each incoming highway during each cell instant that are destined for a same one of the outgoing; and a plurality of highway emulation groups each highway emulation group being allocated to a corresponding one of the outgoing highways and having a specified number of counters that are each connected to simultaneously receive the output from the traffic summator, said specified number of counters of each of said highway emulation groups having a different threshold value and being configured to count the number of cells being output from the summator to each counter until said count exceeds the different threshold value of each counter so that an estimate of the number of cells lost on the corresponding one of the outgoing highways can be obtained based upon a difference determined between the exceeded different threshold value of each counter and the output from the traffic summator.