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CHAPTER 4: MAINTENANCE AND TROUBLESHOOTING
4.1 MAINTENANCE
4.1.1 FINDING OUT THE PROBLEMS
When the electrical current becomes dangerous, the Power LEDs on the chassis will light red. When the problems have been
cleared, the LEDs return to normal.
If the fuse has blown or the power supply has broken down, the POWER LEDs will be off and the fans will not work. (The fuse is
under the plug; you can pull it out to check or change it.)
When the fans of chassis have broken down,the POWER LEDs will light green, but the fans will not work. If this happens, replace the
power supply.
If the power supply of chassis is operating normally, but the LEDs on the media converters are off, there may be problems with the
connection between the plug board of chassis and the power supply. Stop the electrical current, pull out the power adapter and
check it, then reinsert the power adapter.
4.1.2 REPLACING THE POWER SUPPLY
When one of the dual power supplies has broken down, the chassis can work normally. The power supplies are hot-swappable, so
you don't need to power down the chassis if the redundant power supply is still working. Remove the broken power supply, pull out
the plug and replace it with a new power supply and connect the plug.
When a single power supply broken down, follow the above steps. The converters installed in the chassis will stop working until a
new power supply is installed and working normally.
4.2 TROUBLESHOOTING
TABLE 4-1. PROBLEMS/CAUSES/SOLUTIONS
PROBLEM
CAUSE
POSSIBLE SOLUTION
Poewr LEDs are OFF
Power plug not connected or not a valid connection
Connect the power plug and make sure it is a valid
connection
Link/Act LED is OFF
1. Electrical cables not connected to the electrical
port or not a valid connection
2. Wrong cables used for electrical connection
3. NIC or terminal fault
1. Connect the electrical cables to the electrical port
and make sure it's a valid connection
2. Use the correct type of cables
3. Make sure the NIC and Ethernet terminal can work
normally
FX and FX Link/Act LEDs are OFF
1. There may be a fault with the terminal optical
devices
2. The optical fiber has broken down or the optical
fiber connection is not valid
3. The optical fiber is overloss
Check the terminal optical devices and the main
fiber to see if they can work normally. If not, repair
or replace them
TX and FX LEDs are normal, but
data cannot be transmitted
1. The connection between the optical fiber and
devices is not valid
2. The system does not receive enough power
1. Check the fiber connectors and make sure the
connection between optical fiber and devices is valid
2. Turn off the power supply, wait a minute, then
power on the unit and try again
