Failure phenomenon: A factory in the internal network, the previous workshop did not network, the recent workshop of the computer also connected to the local area network, even after the good, found often dropped or unable to log on to the network. Thought is the problem of network card, check the driver of the network card, protocol and IP address are normal.
Fault analysis and elimination: According to the fault analysis, this fault may be a network cable problem or switch problems caused. First check with Ping, found serious packet loss and timeout, with the line tester test cable, all the lines. In the test, it is not found that the distance from the switch to the workshop computer is too long, carefully measuring the distance of 100m. Since the transmission distance of twisted pair is generally not more than 100m, the actual transmission distance is within 95m. Seems to be the problem of network cable, adjust the position of the switch after troubleshooting.