S3756 Hardware Installation Manual
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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 S3756 switch and their description:
