Problem Solving - 3Com 2800 Series User Manual

3

Problem Solving

At regular 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 Twisted Pair 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).
14