| 摘要 |
PURPOSE:To progress the delivery of a high priority data by providing a priority field to a data packet and providing a priority distinction accumulating buffer to a packet exchange section. CONSTITUTION:A value in response to the priority is set in a priority field 31 of a packet of a host 12 from packet terminal equipments A-D and a value is set to the field 31 in the data packet from the host in response to the priority of the terminal equipment. The packet 24 arriving in the exchange 14 is stored in accumulating buffers 21-23 (A-C) with priority and transmitted to the host in the order of priority. When buffers A, B are idle, the data of the C is sent. In storing the data packet to the buffers A, B during the data transmission of the C, they are used with priority. The data transmission from the host to the terminal equipment is implemented similarly. Through the constitution above, the data delivery with high priority is progressed without being affected by the congestion of the packet network.
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