An object of the present invention is to provide this in MPIO based router system using the same and a frame relay method to other services that may be accommodated in the ATM-based router MPOA.; According to the invention, the frame relay interface unit, the frame received by receiving the data encapsulated frame is a RFC1490 frame for from the relay network is converted to a LAN emulation frames for data transmission of the MPOA router and transferred to the routing processor, via the ATM network, converts the LAN emulation frames in RFC1490 frame includes a connection interlocking module for transmitting the frame relay network; Routing processor unit, a routing processing for receiving from the connected interlocking modules enter the LAN emulation frames, and transmitted to the ATM network by performing a route setting process, transmit and receives the ATM cells from the ATM network performing a route setting process by the connection interlock module that made, including the module is provided with a MPOA router system according to claim.
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