The invention IMT-2000 mobile from the base station controller of the communication system A TM (ATM) for ATM switching ATM cell through a switch AAL5 cell and the AAL2 'separated cells and AAL2' cell the AAL2 cell, the AAL5 type ATM cell demultiplexing to recover and that for providing the AAL2 type ATM cell converting apparatus, this invention is of AAL5 type of ATM cells and AAL2 transmitted from the ATM switch, receives the ATM cell, and demultiplexes the AAL5 ATM cell into a plurality of E1 lines AAL2 ' to recover the ATM cell, AAL2 ATM cell. The extract only the user's voice data packets from the input AAL2 'cells to generate the AAL2 ATM cells put still clamped in one ATM cell. In this way from one device to process the AAL5 cell demultiplexing the AAL2 cell to restore the AAL2 'cells, it can reduce the volume of the device and enables it so that the use of ATM AAL2 cells for voice data processing.
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