Problem Solution

Check whether the Connected LED on the LAN switch port is on.

If the LED is not on, check to make sure you are using the correct cable and that it is properly and securely attached. For example, make sure that you are not using a rolled cable where a straight-through cable is required, or vice versa.

Make sure the cable is correctly wired. Refer to the user guide for your LAN switch for information on cable pinouts.

Use a TDR1 or other cable-checking device to verify that the cable has no opens, shorts, or other problems.

Swap the cable with another of the same kind to see whether the cable is bad. If connections are now possible, the cable is faulty.

Replace or fix the faulty cable as necessary.

Power supply

Step 1

Check the Power LED. If it is not on, make sure the LAN switch is plugged in and is

problem

powered on.

Step 2

Check for a blown fuse. If the fuse is blown, refer to the user guide for your LAN switch

for information on replacing the fuse.

Step 1 Check whether the Connected LED on the port is on.

Step 2 If the LED is not on and the cabling is intact, there might be a bad switch port or other hardware problem.

Step 3 Check whether the Module Enabled LED is on for FDDI and Fast Ethernet modules. Step 4 If the LED is not on, remove and reseat the module. Step 5 Check the switch hardware and replace any faulty components.

1 TDR = Time Domain Reflectometer

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