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1 Hours ago upload
As shown in the figure, R4 is configured to go out through two links. When one link is interrupted, it will all be switched to the other, and it will automatically switch back when it is restored. R4 can sense and switch when the downlink of the equipment connected with R4 is interrupted, but R4 cannot perceive and access the traffic when the uplink is interrupted. What technology can achieve R5 uplink interruption, R4 can also sense it
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