| 摘要 |
An ATM switch capable of preventing the network resource from being wasted during the occurrence of an overcrowding condition. In the ATM switch, both a message type and a processing mode are stored in correspondence to the connections. When the discarding of a cell occurs, the connection to which the discarded cell belongs is set to a discard mode by a cell discard controlling circuit, and each cell constituting the same message as that of the discarded cell out of the subsequent cells is discarded, and when a demarkation of the message has been detected, the processing mode is returned to a transfer mode, whereby the subsequent received cells are transferred in a normal manner. Thus, the cell which has become useless for a reception terminal is discarded in the network.
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