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3Com 3C16897 8-slot DC Chassis Troubleshooting the, Configuration, Power, No information is

Models: 3C16894 4-slot Chassis 3C16897 8-slot DC Chassis 3C16895 7-slot Chassis 3C16896 8 slot AC Chassis

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5

TROUBLESHOOTING

This chapter covers the following topics:

■Troubleshooting the Configuration

■Troubleshooting Power

■Troubleshooting the Fan

■Troubleshooting the Modules

The simplest way to diagnose a fault is to check the system status LEDs on the Fabric modules. In addition, with the DeviceMgr network management system, you can also locate the fault through management software.

Troubleshooting the	After the switch is powered on, booting information is displayed on the
Configuration	configuration terminal. If the configuration system has failed, there is no screen
	display at the configuration terminal or the displayed characters are illegible.
No information is	If there is no information displayed on the terminal after the Switch 7750 is
displayed on the	powered on, check that:
terminal	■ The power system is working normally.
	■ The power system is working normally.
	■ The Fabric is working normally.
	■ The console cable has been connected to the console port in the Fabric.
	If this procedure does not reveal the problem, verify that the console cable is
	properly connected and that the configuration terminal is set correctly.
The display characters	If the displayed characters are illegible, the parameters of configuration terminal
are illegible	may not have been set correctly. See Setting Terminal Parameters on page 49.

Troubleshooting	If the Power OK LED is off, there may be something wrong with the system power
Power	supply. Check that:
	■ The power module has been installed in the correct position to ensure normal
	communication with the backplane.
	■ The switch power has been turned on.
	■ The power cord is connected properly.
	■ The source voltage is correct.

Image 67

3Com 3C16897 8-slot DC Chassis manual Troubleshooting the, Configuration, Power, No information is, displayed on the

Contents

3C16896 8-slot AC Chassis 3C16897 8-slot DC Chassis 3Com Family Switch 7750 Installation Guide3C16895 7-slot Chassis 3C16894 4-slot Chassis and associated modules 01752-3064 3Com Corporation350 Campus Drive Marlborough, MACONFIGURING THE SWITCH CONTENTSSWITCH 7750 COMPONENTS INSTALLING THE SWITCHMAINTAINING HARDWARE TROUBLESHOOTINGOBTAINING SUPPORT FOR YOUR SWITCH MAINTAINING SOFTWAREDocumentation ABOUT THIS GUIDEConventions Related6 ABOUT THIS GUIDE Switch Chassis SWITCH 7750 COMPONENTSSwitch Backplane Fabric Module Figure 3 Fabric Table 3 lists Fabric specificationsTable 3 Fabric Specifications Figure 3 illustrates the front panel of the Fabric1000BASE-X-SFP Ports Compact Flash CF PortEthernet Port Console PortModule LEDs Power LEDsReset Button Fabric 32 Submodules4-Port 10/100/1000BASE-T Submodule 12-port 10/100/1000BASE-T and 4-port 1000BASE-X SFP Module 3C168916 I/O Modules12-port 1000BASE-X SFP and 4-port 10/100/1000BASE-T Module 3C186917 Figure 12illustrates the 48-port 10/100BASE-T FE PoE module 48-port 10/100/1000BASE-T PoE Module Table 22 describes the 48-port 10/100/1000BASE-T PoE module LEDs transmission distance Table 21 Specifications for the 48-Port 10/100BASE-TX FE ModuleCables and maximum Cables are 2 100-ohm Category-5 twisted pairs up to 100 m 300 ftModule Figure 15 Front Panel of the 48-port 48-port 100BASE-X SFP Module Table 26 lists the cables for the 48-port 100BASE-X SFP ports Each 100 Mbps optical port has a green LED, as shown in Figure Figure 18 illustrates the 20-Port 10/100/1000BASE-T Module ModuleTable 30 lists specifications of the 20-port 10/100/1000BASE-T module 12-port 10/100/1000BASE-T and 4-port 1000BASE-X SFP Module 3C168916 26 CHAPTER 1 SWITCH 7750 COMPONENTS12-port 1000BASE-X SFP and 4-port Figure 24 12-port 1000BASE-X SFP and 4-port 10/100/1000BASE-T Module Table 38 lists the cables for the 1000BASE-X SFP ports Figure 26 8-Port 1000BASE-X GBIC Module Figure 28 illustrates the 8-port 10/100/1000BASE-T GE module ModuleTable 42 describes the LEDs on the 8-port 10/100/1000BASE-T GE module System Power ModulePower Distribution External PoE PowerFan Assembly Table 46 Specifications for the Switch 7750 System Switch 7750 SpecificationsTable 46 provides detailed information about features of the Switch Figure 31 Fan Assembly36 CHAPTER 1 SWITCH 7750 COMPONENTS Table 46 Specifications for the Switch 7750 System continuedPreparing to Install INSTALLING THE SWITCHGeneral Safety Recommendations Temperature and Humidity Electrical SafetyMoving the Switch Laser SafetyElectromagnetic Discharge Static ElectricityLightning Damage Workbench Installing the CablingRack CabinetInstalling a Installing a ModuleSubmodule Configuring Power Connecting theGround Wire Connecting andCords Connecting DC Power To connect DC power cords, do the followingFigure 34 Back of the PoE Rack Power CordFigure 35 Front Panel of the PoE Rack Assembly Installing the FanInstalling Cables Connecting Optical Fiber Cables Cables Connecting Electrical Port CablesSC fiber connector MT-RJ fiber connector Installing Cablingoperates correctly Post-installationChecklist Installation ChecklistSetting Terminal CONFIGURING THE SWITCHConfiguring the Switch 7750 and aBaud rate = Databit = Parity check = none Stopbit = 7 Select VT100 in the Emulation dropdown menu 8 Click OK The voltage of power supply can meet the requirements on the switch Booting the SwitchBefore powering on the Switch 7750, verify that Power cords have been properly connectedPlease check LEDs Booting the Switch 77503Com You can now begin the configuration for the SwitchMAINTAINING SOFTWARE The terminal displays the following information Downloading an Application to Flash Memory Selecting the Application File for the Boot 7 Type Y to run the primary image 60 CHAPTER 4 MAINTAINING SOFTWARE 2 Enter 3 in the download program menu 11 Change the protocol name for the download to Xmodem the 8-slot Chassis Lost PasswordsPress Ctrl+B. The system displays Using the BOOT Menu 66 CHAPTER 4 MAINTAINING SOFTWARE Troubleshooting TROUBLESHOOTINGTroubleshooting the ConfigurationTable 50 describes power LEDs on the Fabric. continued Troubleshooting the FanModules Troubleshooting theModule Replacing a Power ModuleMAINTAINING HARDWARE Module70 CHAPTER 6 MAINTAINING HARDWARE Replacing a Power SupplyAssembly Replacing the FanReplacing I/O Modules To replace an I/O module, you need 72 CHAPTER 6 MAINTAINING HARDWARE Access Software OBTAINING SUPPORT FOR YOUR B SWITCHto Gain Service ServicesTelephone Technical Contact UsSupport and Repair Telephone Technical Support and Repair http//lat.3com.com/lat/support/form.htmlhttp//lat.3com.com/br/support/form.html latsupportanc@3com.com76 CHAPTER B OBTAINING SUPPORT FOR YOUR SWITCH This appendix covers the following types of cables and connectors SWITCH 7750 CABLESConsole Cable AUX CableFigure 46 The RJ-45 Connector ConnectorElectrical Port Figure 46 illustrates the RJ-45 connectorTable 56 RJ-45 MDI-X Port Pinouts ConnectorsFigure 47 SC Optical Fiber Connector Table 56 lists RJ-45 MDI-X Port Pin-outsFigure 49 LC Connector Figure 48. illustrates the MT-RJ fiber optic cable connectorFigure 49 illustrates the LC connector Figure 48 The MT-RJ Fiber Connector