| 摘要 |
PURPOSE:To economically and efficiently perform packet transfer by setting information to instruct the possibility of deletion of a packet when the packet encounters congestion in a switching machine and the information to instruct the necessity of re-transmission when it encounters a transmission path error. CONSTITUTION:The information from a TV camera 3 and a mike 4 as terminals, for example, TV conference terminals are assembled as the packet at a packet disassembling device 5, and is transferred to a packet switching machine 7, and the switching machine 7 transfers the packet after dividing to constant length. On the packet, a deletion classification field to instruct the possibility of the deletion of the packet in the case of encountering to the congestion in the switching machine and a re-transmission classification field to instruct the necessity of re-transmission in the case of encountering to the transmission path error are set. Furthermore, the transfer of the packet from the switching machine 7 to another switching machine is performed with an 1 frame when the re-transmission is needed, and with a UI frame when it is not needed, and the switching machine 8 receiving the packet controls the deletion when the congestion is generated in an output route based on the information of the possibility of the deletion. In such a way, it is possible to perform the packet transfer economically and efficiently.
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