3Com Router 6000 FamilyInstallation ManualChapter 1Preparing for Installation3Com Corporation1-10III. LEDThe following figure illustrates the front panel of AC-input PSU.Figure 1-9 Front panel of AC-input PSUThe following figure illustrates the front panel of DC-input PSU.Figure 1-10 Front panel of DC-input PSU.Table 1-4 PSU LED descriptionLED DescriptionALM (red) ON means the PSU is not present or has failed.RUN (green) Steady ON means the PSU is operating normally, and OFFmeans the PSU has failed.AC/DC OK (red)PSU input LED (only for the AC-input PSU). Steady ON meansthe normal voltage (85 to 264 V) is inputting, and OFF meansthe opposite.1.4.3 FAN moduleI. FunctionsThe 3Com Router 6040 is configured with six fans; the 3Com Router 6080 is configured witheight fans. These fans are working in pairs and the two fans in each pair are working inredundancy. When all these fans are working normally, the operating temperature of thesystem can be maintained between 0 and 55oC (32 to 131 oF). As the failure of a fan does notaffect the operation of other fans, the normal operating temperature of the system canmaintain.The routing speed of the fans is adjusted by the fan controller on the main control board andbetween 50% and 100% depending on the system temperature. When the systemtemperature rises above the high-temperature threshold set by the fan controller, the fans arerotating at full speed (100%); when the system temperature drops below the low-temperature
