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Chapter 5 Hardware Fault Analysis
The part describes how to remove the fault from the switch.
5.1 Fault Separation
The key for resolving the systematic faults is to separate the fault from the system.
You can compare what the system is doing with what the system should do to
detect the fault. You need to check the following subsystems:
Power and cooling systems—power and fan
Port, cable and connection—ports on the front template of the switch and the
cables connecting these ports
5.1.1 Faults Relative with Power and Cooling System
Do the following checkups to help remove the fault:
When the power on-off is at the “ON” location, check whether the fan works
normally. If the fan does not work well, check the fan.
The working temperature of the switch is from 0 to 40 Celsius degrees. If the
switch is too hot, check whether the air outlet and air inlet are clean and then
do relative operations in section 2.3 “Requirements for Common Locations”.
If the switch cannot be started and the PWR indicator is off, check the power.
5.1.2 Faults Relative with Port, Cable and Connection
Do the following checkups to help remove the fault:
If the port of the switch cannot be linked, check whether the cable is
correctly connected and whether the peer connection is normal.
If the power on-off is at the “ON” location, check the power source and the
power cable.
If the console port does not work after the system is started up, check
whether the console port is set to a baud rate of 9600 bps, eight data bits, no
sum check bit, one stop bit and no traffic control.
5.2 Indicator Description
The following table shows the indicators of the 24 SWITCH and their description:
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