Fan Fail Led; Low Batt Led; Dangerous Environmental Conditions Display - 3Com 3C780 - LinkBuilder FDDI Base Unit User Manual

5-14 Using the Hub

FAN FAIL LED

If the FAN FAIL LED shows amber, the fan has failed and must be replaced.
You must send the hub base unit back to 3Com to replace the fan. Contact your
3Com representative for a Return Materials Authorization (RMA).
HI TEMP LED
If the HI TEMP LED shows amber, it means that the temperature in the hub
exceeds 50° C. Check to be sure that nothing is blocking air flow around the
chassis. If the temperature in the wiring closet exceeds 50° C and nothing is
blocking the flow of air into the hub, you should install a cooling system for the
closet.

LOW BATT LED

If the LOW BATT LED is on, a low battery condition exists and nonvolatile
RAM will not retain data if power is lost. You must replace the battery. See the
instructions in the section "Installing the Battery" in Chapter 2.

Dangerous Environmental Conditions Display

If any of the environmental dangers exist (Fan Fail, Hi Temp, or Low Batt), the
appropriate LED listed in Table 5-8 will show amber. In addition, an
appropriate message appears on a terminal directly or remotely (Telnet)
connected to the hub.
When one or more of these conditions exist, a message is appended to any
displayed command string or new line followed by [Enter] that you type. For
example, if all conditions were to exist, you would see the following alert
message after you entered a command and the terminal displayed the
command's response:
Hardware: (FAN FAILURE) (HIGH TEMP) (LOW BATTERY)
Only those conditions that exist will be displayed. If none exist, nothing is
displayed.