Patent ID: 6463036
Filing Date: 2002-10-08
Classification: H04L,H04Q

Abstract:
An asynchronous transfer mode (ATM) communication apparatus forming an ATM communication network, comprising:a cell buffer portion which temporarily stores cells received from a plurality of cell transmitting origin communication apparatuses and outputs said cells to a destination communication apparatus; a congestion detecting portion which detects a congestion state of said cell buffer; a transmitting origin identifying portion which identifies a cell transmitting origin communication apparatus which has input a cell to said cell buffer portion that caused said congestion state from previously registered information in said plurality of cell transmitting origin communication apparatuses based on an output of said congestion detecting portion, wherein said previously registered information being connection information of a connection previously set between said cell transmitting origin communication apparatus and said destination communication apparatus; a congestion notifying cell generating portion which generates a congestion notifying cell; and an output portion which transmits said congestion notifying cell to said cell transmitting origin communication apparatus identified by said transmitting origin identifying portion at the time of congestion in said cell buffer, wherein said output portion, subsequent to an output from said cell buffer, transmits said congestion notifying cell by inserting said congestion notifying cell into a cell string which is output from said cell buffer and is to be transmitted to said cell transmitting origin communication apparatus.