3Com 3C13755-US - Router 5642 Installation Manual

Also see for 3C13701: Installation guide Quick reference guide Installation guide Getting started guide Module guide

Contents

3Com 3C13755-US - Router 5642 Installation Manual Manual pdf 88 page image

86 CHAPTER 7: T ROUBLESHOOTINGIllegible CharactersDisplay on theTerminal afterPower-OnIf the system operates normally after the system runs the POST, the start-upinformation is displayed on the console terminal. If the configuration system has afault, the terminal may display only illegible characters.If the console terminal displays illegible characters after the POST, verify that theHyperTerminal parameters are set properly, as follows:■ Baud — 9600■ Data bits — 8■ Stop bit — 1■ Parity — None■ Flow control — None■ Terminal emulation — VT100If the parameter settings do not match these values, reconfigure them.Repeated Reboot There are two possible situations in which the system reboots repeatedly:■ After Now testing memory... displays■ After System now is starting... displays, the system restarts repeatedly anddisplays, Copied program error.Repeated reboots are caused by damage to the SDRAM. You can check whetherthe SDRAM has a fault by checking the LED status of the router. During the POST,the SLOT0 – SLOT2 LEDs and SERIAL0 LED light first. If the SLOT0 and SLOT1 LEDsare on instead, the SDRAM test has failed.If the SDRAM is damaged, you must replace it. See “Replacing the SDRAM” onpage 82.Troubleshooting SICsand MIMsThe LEDs on the Router 5000 Family routers indicate whether the modules areproperly installed. After the installation of a module, turn on the power and checkthe corresponding LED on front panel of the router. If the LEDs are on, the POSTwas successful and the router is working normally. If the LEDs are off, the POSThas failed. You can test it using the following steps:■ Check that the port cable matches the port.■ Verify that the module is in normal operation by observing its LEDs .■ Use the display command to check whether the module or interface modulehas accepted the configuration.All LEDs of the Encryption Accelerator MIM Remain off after StartupAfter startup, all LEDs should blink once. If all indictors are off, the module orhardware on the module has not powered on. Check whether the power of theintegrated equipment is properly connected.If the power of the integrated equipment is in normal operation, the fuse of themodule may have burnt out or the Complex Programmable Logic Device (CPLD)