| 摘要 |
By a method and device which improve a transmission efficiency on an ATM transmission line upon network relay between an ATM cell and an Ethernet frame which is a variable length frame of a predetermined specification, a frame of a nonstandard frame format is generated, in which header information free from troubles in an end-to-end transfer even if the information is deleted from the Ethernet frame of a standard frame format for inter-layer conversion is deleted therefrom, and a plurality of ATM cells are generated from the frame of the nonstandard frame format. Also, by performing a reverse operation, the Ethernet frame is generated from the ATM cell. Also, it is made possible to statically or dynamically select the standard frame format and the nonstandard frame format, so that the network relay is realized by performing a conversion between the Ethernet frame and the ATM cell.
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