| 摘要 |
PURPOSE:To decrease the time for retransmission and to reduce the load to the system, by retransmitting the same packet from the memory in the control unit after a given time without sending the end signal to the subsystem, when the content of response from the reception control unit is busy. CONSTITUTION:The data buffer 3 of a plurality of communication control units 1 is connected in right with the transmission line through the reception section 2 and the transmission section 4 to perform the detection of vacant packet and arrival packet with the common control section 5, and the packet buffer memory 7 of the channel section 8 stores the data for transmission and reception and perform the giving and receiving of packet with the subsystem. When the packet fed from the transmission section 4 returns after circulating the transmission line, the content of response is interpreted with the decoder of the channel control section 6, and if the busy is discriminated, the timer in the control section 6 is started and transmission request signal is fed to the memory 7 when a given time is elapsed after start and the same packet in the memory 7 is again fed on the transmission line via the buffer 3. |
