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Fast Ethernet Switching System User’s Guide
Troubleshooting
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Troubleshooting
This troubleshooting section is intended to help you solve the most common problems on
the DES-5016.
The Diagnostic LED displays a code if there is a problem on the DES-5016. 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 Solution
POST Errors The DES-5016 performs a Power On Self Test (POST) every time
it is powered on. If you are connected to the DES-5016 through
Local Console Management during the POST you can see the
results displayed on your monitor. The login screen appears after
the DES-5016 has completed the POST.
The POST checks all of the hardware components on the DES-
5016. See Table 9: Diagnostic LED for proper actions.
Cables Faulty cable is the most common source of problems on Ethernet
and Fast Ethernet networks. Check the cable first if you are having
any problems connecting to a device.
Ethernet is more fault tolerant than Fast Ethernet. If you are
moving from Ethernet to Fast Ethernet, make sure the cables are
pinned out correctly. See Chapter 3, Connecting the DES-5016 to
the Network, Cable Specifications, for a diagram showing the
proper pin arrangement for Ethernet and Fast Ethernet.
Port States All ports on the DES-5016 have two modes: auto negotiation mode
and 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-5016 and on the link partner to verify settings.
See Chapter 4, LEDs, for an explanation of all LEDs.
The port settings on the DES-5016 and the port settings on the
device you are 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.
Power LED is Off Check the three pronged power plug and verify that you are getting
power from the wall socket. If the DES-5016 is on and the power