A novel Dedicated Multimedia Fiber Industrial Network (FIN) established by consulting the protocols and standards of FDDI-II satisfies the specific requirements of real-time transmission. In this paper, the characteristics of services in FIN are analyzed and the services are classified according to the definition of the Isochronous and Packet ones. Basing on the service partition, the requirements for bandwidth of services are analyzed, and structures of the Cycle Frame and the Token are determined. In the end, the flow charts of transmitting and receiving Cycle Frames in FIN are presented, and the data transaction results of the sub-layers are simulated.
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