10/100 Auto Negotiation Switch User’s Guide
6
Troubleshooting
This troubleshooting section is intended to help you solve the most common problems on the
The
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 |
| powered on. If you are connected to the |
| 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 |
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 |
| Cable Specifications, for a diagram showing the proper pin |
| arrangement for Ethernet and Fast Ethernet. |
Port States | All ports on the |
| 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 |
| See Chapter 4, LEDs, for an explanation of all LEDs. |
| The port settings on the |
| 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
Troubleshooting | 55 |
