| 摘要 |
In an ATM communication apparatus, when a transmission schedule section determines a transmission virtual channel, payload data corresponding to a plurality of cells is read out from a host memory if no payload for the virtual channel is present in a transmission payload temporarily storing section. The payload corresponding to a first cell, a corresponding cell header, and a corresponding cell trailer are formed into a transmission cell. The cell is transmitted to a physical layer device. Payloads corresponding to the second and subsequent cells are temporarily stored in the transmission payload temporarily storing section. When the transmission schedule section determines the virtual channel as a transmission virtual channel afterward, a payload is read out from the transmission payload temporarily storing section if the payload is stored therein. The read payload, corresponding header information, and corresponding trailer information are formed into a transmission cell. The cell is transmitted to the physical layer device.
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