Dell PowerConnect 3248 System User's Manual

Also see for PowerConnect 3248: Manual Features list Specification

Back to Contents PageAppendixDell™ PowerConnect™ 3248 Systems User's GuideTroubleshootingDownloading Firmware Through the Console PortTechnical SpecificationsGetting HelpRegulatory NoticesTroubleshootingThis 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 "Contacting Dell").LEDsl All light-emitting diodes (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, youmay 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 "" for more information.Portsl 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 Accessl 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 ConsolePort" 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, anddefault 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.¡ Your management station has management VLAN access (see "Management VLAN Access").NOTICE: Operating temperature for the switch must not exceed 40ºC (104°F). Do not place the switch in the direct sunlight or near warm air exhaustsor heaters.