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10/100 Auto Negotiation Switch 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-3216.
The DES-3216 does not have external LED error messages. If there is an error and it 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-3216 performs a Power On Self Test (POST) every time it is
powered on. If you are connected to the DES-3216 through Local
Console Management during the POST you can see the results
displayed on your monitor. The login screen appears after the DES-
3216 has completed the POST.
The POST checks all of the hardware components on the DES-3216.
Cables Faulty cables are the most common source of problems on Ethernet
and Fast Ethernet networks. Check the cables 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-3216 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-3216 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-3216 and on the Network Interface Card to verify settings.
See Chapter 4, LEDs, for an explanation of all LEDs.
The port settings on the DES-3216 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 power plug and verify that you are getting power from the
wall socket. If the DES-3216 is on, the power LED is not working
properly. Return the DES-3216. If the DES-3216 is not powering on