Patent ID: 7382783

Claim:
A multiplex transmission apparatus configured to load an ATM cell with an IP packet and transmit the ATM cell to an ATM network, the multiplex transmission apparatus comprising: an intermediately generated packet generator configured to generate, depending on DiffServ Code Point (DSCP) header information of the IP packet, an intermediately generated packet having Channel Identifier (CID) header information; a buffer storage configured to select, from a plurality of transmission waiting buffers, a transmission waiting buffer which is prepared for a QoS class associated with the CID header information of the intermediately generated packet, and to store the intermediately generated packet in the selected transmission waiting buffer; an extractor configured to extract, the intermediately generated packet from the selected transmission waiting buffer in an order according to the QoS class among the plurality of transmission waiting buffers; and an ATM cell transmitter configured to load the ATM cell with the intermediately generated packet extracted from the selected transmission waiting buffer and transmit the ATM cell to the ATM network.