| 摘要 |
PURPOSE:To enable a terminal to perform a resending, by detecting the collision of packets by comparing a first-come input signal with an input signal inputted later than the input signal, and informing a bit of detecting information to a communication terminal. CONSTITUTION:By setting an input signal detecting device 2 at a collision detecting mode, an input channel in which a collision is generated, is detected, then being stored. In the collision detecting mode, since the inverted signal of the first-come input signal is supplied to the input of a gate at the preceding stage from a reference signal line, the differential signal of the input signal of the input of the first-come input signal is outputted. A switching control device 5 connects the collision signal transfer channel of a switching matrix device 1 to the output channel of the first storage, and makes output a collision signal from an output channel 2, and also, cuts off connections to the output channels corresponding to all of the input channels in which the first collision are generated. In this way, a transmission station can perform the resending, and also,communication efficiency is not lowered compared with a communication when no collision is generated.
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