| 摘要 |
PURPOSE:To avoid a packet not relevant to a lost packet from being unnecessarily retarded by a relay switching by allowing switching only accommodating a destination terminal equipment of the packet to apply the sequence control of the packet if the packet is lost in a communication line and a selective retransmission is requested. CONSTITUTION:A switching detecting a missing frame 18 lost due to transmission error or the like in a satellite line or the like applies a selective retransmission request and the sequence control of a packet 15 sent by the frame 18 attended with the selective retransmission is implemented by only the switching accommodating the destination terminal equipment of the packet 15 and a switching relaying the packet 15 does not implement any sequence control of the packet 15. Thus, a packet 15 addressed to other terminal equipment not relevant to the missing packet 15 is not retarded improperly.
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