Regulation method and apparatus for ATM cell delay variation

Abstract

A regulation apparatus for ATM cell delay variation includes a variation regulating buffer for temporarily storing cells transferred thereto, a variation waiting timer for controlling a waiting time which extends from reception of the first cell to read-out of cells from the buffer, a read-out timer for controlling intervals at which cells are read from the buffer, a latest cell preservation memory for storing the latest cell transferred from a VPI/VCI demultiplexing unit and, a selector for selecting a cell stored in the buffer or in the memory to transfer the selected cell to a cell reproduction unit. The invention further includes a communication type discriminator for discriminating a communication type in a call set-up phase upon starting a communication and for calculating a variation waiting time in accordance with the discriminated communication type to set the calculated variation waiting time to the variation waiting timer, and a dummy cell inserting circuit for inserting the last reaching cell as a dummy cell if a cell delay time cannot be regulated by the variation waiting time in a communication of sound or moving images.

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