User Guide
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... Table 56 Cable Diagnostics 56 5 TROUBLESHOOTING Resetting to Factory Defaults 59 Forgotten Password 59 Forgotten Static IP Address 60 Solving LED Issues 60 If the Problem Persists 61 A OBTAINING SUPPORT FOR YOUR PRODUCT Register Your Product 63 Purchase Value-Added Services 63 Troubleshoot Online 63 Access Software Downloads 63 Telephone Technical...
... Table 56 Cable Diagnostics 56 5 TROUBLESHOOTING Resetting to Factory Defaults 59 Forgotten Password 59 Forgotten Static IP Address 60 Solving LED Issues 60 If the Problem Persists 61 A OBTAINING SUPPORT FOR YOUR PRODUCT Register Your Product 63 Purchase Value-Added Services 63 Troubleshoot Online 63 Access Software Downloads 63 Telephone Technical...
User Guide
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... - 6 ABOUT THIS GUIDE Related Documentation In addition to this guide, each 3Com Baseline Switch 2250 Plus documentation set includes the following information when contacting us . Please e-mail comments about the current software release, including new features, modifications, and known problems. Documentation Comments Your suggestions are very important to you perform tasks using...
... - 6 ABOUT THIS GUIDE Related Documentation In addition to this guide, each 3Com Baseline Switch 2250 Plus documentation set includes the following information when contacting us . Please e-mail comments about the current software release, including new features, modifications, and known problems. Documentation Comments Your suggestions are very important to you perform tasks using...
User Guide
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...any SFP modules that are not swapped If these checks do not identify the cause of the problem, it may be that the unit or the device connected to the port is faulty. Contact your 3Com network supplier for further advice. (4) Module Active LEDs The Module Active LEDs show the status ...of the problem, it may be that the unit or the device connected to the port, or there is a problem. ■ Verify that the attached device is ...
...any SFP modules that are not swapped If these checks do not identify the cause of the problem, it may be that the unit or the device connected to the port is faulty. Contact your 3Com network supplier for further advice. (4) Module Active LEDs The Module Active LEDs show the status ...of the problem, it may be that the unit or the device connected to the port, or there is a problem. ■ Verify that the attached device is ...
User Guide
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... a 19-inch equipment rack using the supplied mounting kit, (see "Using the Mounting Kit" on page 14), or it can cause reliability problems in your equipment. When mounting the unit, take note of the guidelines given in "Positioning the Switch" on top of dust as possible..... ■ Die Luft so frei wie möglich von Staub ist. ■ Es unwahrscheinlich ist das die Betriebstemperatur überschritten wird. 3Com empfiehlt das Sie den Switch in der nähe von elektrischen Störquellen befinden. CAUTION: Before continuing, disconnect all cables from the underside...
... a 19-inch equipment rack using the supplied mounting kit, (see "Using the Mounting Kit" on page 14), or it can cause reliability problems in your equipment. When mounting the unit, take note of the guidelines given in "Positioning the Switch" on top of dust as possible..... ■ Die Luft so frei wie möglich von Staub ist. ■ Es unwahrscheinlich ist das die Betriebstemperatur überschritten wird. 3Com empfiehlt das Sie den Switch in der nähe von elektrischen Störquellen befinden. CAUTION: Before continuing, disconnect all cables from the underside...
User Guide
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... Plug the power cord into a power outlet. Installing proper grounding helps to avoid damage from sags and surges to avoid unforeseen network outages. 3Com recommends that network cables and the power cable are securely connected. Checking for use the self-adhesive rubber pads supplied. When the Switch is ... the only method of the Switch flashes green. Apply the pads to the underside of each corner. Supplying Power to the Switch Power problems can be placed one in the marked area at the top. To power on and ready for Correct Operation After you install power conditioning,...
... Plug the power cord into a power outlet. Installing proper grounding helps to avoid damage from sags and surges to avoid unforeseen network outages. 3Com recommends that network cables and the power cable are securely connected. Checking for use the self-adhesive rubber pads supplied. When the Switch is ... the only method of the Switch flashes green. Apply the pads to the underside of each corner. Supplying Power to the Switch Power problems can be placed one in the marked area at the top. To power on and ready for Correct Operation After you install power conditioning,...
User Guide
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...and that no cables are keyed and can then be attended to when there will be properly inserted only one way. If you experience any problems can be least effect on the front of a possible failure; Performing Spot Checks 19 CAUTION: SFP transceivers are pulled taut Cooling fan Where...front right hand side of the cable to a device fitted with an appropriate Gigabit Ethernet connection. 7 Check the Module Active LEDs on users. 3Com recommends periodically checking the items listed in Table 9. Attach a male duplex LC connector on the network cable into the duplex LC connector on the...
...and that no cables are keyed and can then be attended to when there will be properly inserted only one way. If you experience any problems can be least effect on the front of a possible failure; Performing Spot Checks 19 CAUTION: SFP transceivers are pulled taut Cooling fan Where...front right hand side of the cable to a device fitted with an appropriate Gigabit Ethernet connection. 7 Check the Module Active LEDs on users. 3Com recommends periodically checking the items listed in Table 9. Attach a male duplex LC connector on the network cable into the duplex LC connector on the...
User Guide
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The default admin account settings are experiencing problems and you change the password to prevent unauthorized access to your computer...9632; Password - blank (no password) To ensure that unauthorized users do not intend to actively manage the switch, 3Com recommends that you set an admin password when you set it, refer to "Forgotten Password" on page 59 for ... regain access to re-establish your Internet connection. Even if you do not access the Web interface, 3Com recommends that you want to the Web interface. System Access Click Administration, then System Access on the menu...
The default admin account settings are experiencing problems and you change the password to prevent unauthorized access to your computer...9632; Password - blank (no password) To ensure that unauthorized users do not intend to actively manage the switch, 3Com recommends that you set an admin password when you set it, refer to "Forgotten Password" on page 59 for ... regain access to re-establish your Internet connection. Even if you do not access the Web interface, 3Com recommends that you want to the Web interface. System Access Click Administration, then System Access on the menu...
User Guide
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Figure 21 SNMP Summary Screen SNMP Simple Network Management Protocol (SNMP) is typically used to evaluate performance or detect potential problems. Click Administration, then SNMP on the menu. SNMP is a communication protocol designed specifically for proper operation in a network environment, as well as to monitor them ...
Figure 21 SNMP Summary Screen SNMP Simple Network Management Protocol (SNMP) is typically used to evaluate performance or detect potential problems. Click Administration, then SNMP on the menu. SNMP is a communication protocol designed specifically for proper operation in a network environment, as well as to monitor them ...
User Guide
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... will configure the link as half-duplex, causing a mismatch that the workstation's network interface is required for 100BASE-TX or 1000BASE-T. 3Com recommends Category 5e or 6 cables for half-duplex operation only. Solving LED Issues This section lists some issues that are related to the...following topics in good condition. ■ The SFP module is correctly inserted. ■ A 3Com SFP module is being connected to a workstation, that will reduce network performance when data is a problem with this connection. For information on page 21. Verify that you assigned to the Switch and ...
... will configure the link as half-duplex, causing a mismatch that the workstation's network interface is required for 100BASE-TX or 1000BASE-T. 3Com recommends Category 5e or 6 cables for half-duplex operation only. Solving LED Issues This section lists some issues that are related to the...following topics in good condition. ■ The SFP module is correctly inserted. ■ A 3Com SFP module is being connected to a workstation, that will reduce network performance when data is a problem with this connection. For information on page 21. Verify that you assigned to the Switch and ...
User Guide
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... ■ The ports are configured for information on disabling the broadcast operation. If the Problem Persists If the problem persists and the unit still does not operate successfully, contact your 3Com network supplier with the following information before returning the unit: ■ Product number and serial... number (printed on the network. If the Problem Persists 61 Ensure that accompanies the device for half-...
... ■ The ports are configured for information on disabling the broadcast operation. If the Problem Persists If the problem persists and the unit still does not operate successfully, contact your 3Com network supplier with the following information before returning the unit: ■ Product number and serial... number (printed on the network. If the Problem Persists 61 Ensure that accompanies the device for half-...
User Guide
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... 73/23/EEC and EMC Directive 89/336/EEC as amended by the Federal Communications Commission helpful: How to Identify and Resolve Radio-TV Interference Problems This booklet is operated in accordance with the instructions, may cause harmful interference to radio communications. Operation of the Canadian Interference-Causing Equipment Regulations. Cet...
... 73/23/EEC and EMC Directive 89/336/EEC as amended by the Federal Communications Commission helpful: How to Identify and Resolve Radio-TV Interference Problems This booklet is operated in accordance with the instructions, may cause harmful interference to radio communications. Operation of the Canadian Interference-Causing Equipment Regulations. Cet...