124 APPENDIX A: TROUBLESHOOTINGNormal LEDMeaningsThis section describes the normal operation of the SuperStack IIbridge/router LEDs.System LEDs The following figure describes the system LEDs.Serial LEDs The following figure describes the serial LEDs.Lights green when the software has successfully loaded and is running.Unlit in normal operation. Flashes green during startup to indicate system is loading software. Lightsamber when there is a load problem.Unlit in normal operation. Lights amber during startup to indicate system is running self-tests.Provides additional status for the Run, Load, and Test LEDs.Lights green when unit has power. Lights amber if there isa problem with power. When unlit, power to unit is off.Flashes green each time a packet is forwarded betweentwo ports.Reserved for future use (model 4xx only).SYSTEMStatusRunTestPower/FaultLoad yyyyAuxFwd FwdPower/Fault yy yyRunTestLoadStatusAuxNormal operationLights green when the path is up.Lights green when there is a physical connection to a serialdevice such as a CSU/DSU or modemUnlit in normal operation. Lights amber if an error in theframes is detected.ALinkActiveFaultBALinkActiveFaultBNormal operationC* D*DC* Model 5xx only
