Importance

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Abstract

Provided is a cell exchanging device which realizes switching of an AAL2 connection level using an existing ATM switch, thus preventing deterioration of a transfer quality of other ATM cells. In an input-side ATM line corresponding section, provided are an ATM cell demultiplexing section 113-I-1 for extracting and separating only an AAL2 cell from an ATM cell, an AAL2 DMX 113-I-2 for converting from the AAL2 cell to an AAL2 partial fill cell, and an ATM cell multiplexing section 113-I-4 for multiplexing and packing the ALL2 partial fill cell and the ATM cell other than AAL2. Before entering to the ATM switch, a priority order of each ATM cell is determined based on class information presented in the ATM line corresponding section, and reading-out from the ATM cell multiplexing section is controlled. Similarly, also in an output-side ATM line corresponding section, at the time of a transfer to a transmission path, a priority order of each ATM cell is determined based on class information presented in the input-side ATM line corresponding section and a reading-out is performed.

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First Claim