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Fast Ethernet Switching System User's Guide
This troubleshooting section is intended to help you solve the most common problems on
the DES-5024.
The Diagnostic LED displays a code if there is a problem on the DES-5024. If an error
cannot be resolved by implementing the solutions in this section, contact D-Link
Technical Support.
All LEDs are explained in detail in Chapter 4, LEDs. If you are having a problem that is
not discussed here, contact technical support.
Problem
POST Errors
The POST checks all of the hardware components on the DES-5024. See
Cables
Faulty cable is the most common source of problems on Ethernet and Fast
Ethernet is more fault tolerant than Fast Ethernet. If you are moving from
Port States All ports on the DES-5024 have two modes: auto negotiation mode and
The port settings on the DES-5024 and the port settings on the device you are
Power LED is Off
Troubleshooting
Solution
The DES-5024 performs a Power On Self Test (POST) every time
it is powered on. If you are connected to the DES-5024 through
Local Console Management during the POST you can see the
results displayed on your monitor. The login screen appears after
the DES-5024 has completed the POST.
Table 8: Diagnostic LED for proper actions.
Ethernet networks. Check the cable first if you are having any
problems connecting to a device.
Ethernet to Fast Ethernet, make sure the cables are pinned out
correctly. See Chapter 3, Connecting the DES-5024 to the
Network, Cable Specifications, for a diagram showing the proper
pin arrangement for Ethernet and Fast Ethernet.
forced mode. Ports in auto negotiation mode auto negotiate the
proper speed and duplex mode. Ports in forced mode have been
manually set to a particular speed and duplex mode. Check the
LEDs on the DES-5024 and on the link partner to verify settings.
See Chapter 4, LEDs, for an explanation of all LEDs.
connecting to must be the same in order for them to communicate.
Check the speed and duplex setting on both the port and device
you are connecting to.
Check the three pronged power plug and verify that you are getting
power from the wall socket. If the DES-5024 is on and the power
LED is not working properly return the DES-5024. If the DES-
Troubleshooting
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