at frequent intervals you should visually check the switch.

    regular checks can give you an early warning of a possible failure; any problems can then be attended to when there will be least effect on users.

    check that all external cabling connections are secure and that no cables are pulled taut.

    refer to the information about leds given earlier in this guide to see if the problem can be identified and solved. here are some common problems that can occur:

    activity status led not lit for a port that has a connection.

    there is a problem with this connection. check that:

    1 the device being connected to is powered on and operating correctly.

    2 the cable is connected at both ends.

    3 you are using a tp cable that is not damaged.

    4 if the connection is to a workstation, that the workstation’s network interface card is installed and configured correctly.

    all activity leds appear to be lit continually. there may be broadcast storms on the network. remove port connections one at a time, waiting a few seconds between each port. if the leds go off after removing a port connection, the device that was connected to that port is introducing an excessive amount of broadcast frames to the network (some pieces of network equipment operate by sending out broadcast frames regularly). refer to the documentation that accompanies the device for information on disabling the broadcast operation.

    if the problem persists and the unit still does not operate successfully, contact your supplier with the following information before returning the unit:

    1 product number and serial number (printed on a label supplied with the unit)

    2 a brief description of the fault condition