Specifications
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Appendix
Dell™PowerConnect™5212SystemsUser'sGuide
Troubleshooting
Downloading Firmware Through the Console Port
Technical Specifications
Getting Help
Regulatory Notices
Troubleshooting
This section explains how to isolate and diagnose problems with the switch. If you have a problem that is not listed here and you cannot solve it, contact Dell
(see "Getting Help").
LEDs
l All light-emitting diode (LEDs) are off.
Ensure that:
¡ You are using an RJ-45 (network) cable and not an RJ-11 (telephone) cable to connect to the switch.
¡ The power cable is firmly connected to the relevant switch unit and to the supply outlet. If the connection is secure and there is still no power,
you may have a faulty power cable.
¡ The switch has sufficient space for adequate airflow on both sides.
l When the switch powers on, the Diag LED lights are red.
The relevant switch unit failed its power-on self-test because of an internal problem. See "Getting Help" for more information.
Ports
l The port does not function.
Ensure that:
¡ The cable connections are secure and the cables are connected to the correct ports at both ends of the link.
¡ The port status is set to Enable and the autonegotiation feature is enabled at the switch. See "Port Configuration" for more information.
Management Access
l The terminal cannot access the switch.
Ensure that:
¡ Your terminal is correctly configured to operate as a VT100 terminal.
¡ You are using a proper null-modem cable.
¡ You have set the terminal emulator program to VT100-compatible, 8 data bits, 1 stop bit, no parity and 9600 bps. See "Connecting the Console
Port" for more information.
l You cannot access the switch using Telnet.
Ensure that:
¡ You have configured the switch's management virtual local area network (VLAN) with a valid Internet Protocol (IP) address, subnet mask, and
default gateway.
¡ Your management station has management VLAN access (see "Management VLAN Access").
¡ The switch is powered up.
¡ You have a valid network connection to the switch and the port you are using has not been disabled.
¡ You have not exceeded the maximum number of concurrent Telnet sessions permitted. Try connecting again at a later time.
l The web browser cannot access the switch.
Ensure that:
¡ You have configured the switch's management VLAN with a valid IP address, subnet mask, and default gateway.
NOTICE: Operating temperature for the switch must not exceed 40ºC(104°F).Donotplacetheswitchinthedirectsunlightornearwarmairexhausts
or heaters.