| 摘要 |
PURPOSE: A network comprising a plurality of sub-networks, which are linked via bridge terminals is provided which increase data processing amount between at least two sub-networks under a specific overload condition. CONSTITUTION: The bridge terminal BT1 is synchronized with the subnetwork SN1 and the bridge terminal BT2 with the sub-network(SN2) at the beginning of the MAC frames segment. At time t1, bridge terminal BT1 sends an absence message to the controller of sub-network(SN1) which then acknowledge receipt of the signal (time t2). The bridge terminal is then not synchronized with either the first or the second sub-network(SN1)or(SN2) for a certain period of time. At time t3, bridge terminal BT1 sends a presence message to the controller of the second sub-network(SN2) which then acknowledges receipt of the signal with an acknowledge signal at time t4. After a certain number of MAC frames, bridge terminal BT1 needs to change back over to the first sub-network(SN1). This changeover phase is introduced by an absence message t5. After the acknowledge signal t6, synchronization with the first sub-network(SN1) begins again. This is terminated by a presence message t7 from the first bridge terminal BT1 and an acknowledge signal from the first sub-network SN1 at time t8. The processes for bridge terminal BT2 are the same as those described for bridge terminal BT1.
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