Importance

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Abstract

In an asynchronous transfer mode (ATM) switching system, a generating section generates test cells at a generation rate, and stops the generation of the test cells in response to a generation stopping instruction. Input and output buffer section stores normal cells and the test cells. Each of the normal cells is used for transferring speech or data Each of the input and output buffer sections issues a congestion notice in accordance with a storage state in the buffer section. An ATM switch receives the normal cells outputted from the input buffer section to transfer to an output port. A test section tests the test cells to determine whether cell conductivity is established. A control section issues the generation stopping instruction to the generating section in response to the congestion notice from the input or output buffer.

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First Claim