3Com 3C780 User Guide - Page 116

FAN FAIL LED, HI TEMP LED, LOW BATT LED, Dangerous Environmental Conditions Display

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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.

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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.