3Com 3C17709, Getting Started Manual

Page: 52 / 86

52 C
HAPTER
4: P
ROBLEM
S
OLVING
Solving Problems
Indicated by LEDs
If the LEDs on the Switch indicate a problem, refer to the list of suggested
solutions below.
The Unit LED does not light
Check that the power cable is firmly connected to the Switch and to the
supply outlet. If the connection is secure and there is still no power, you
may have a faulty power cord or an internal fault. Firstly, check the power
cord by:
■
testing it in another device
■
connecting a working power cord to the ‘problem’ device
■
installing and testing a second PSU
then contact your supplier for advice.
On powering-up, the Unit Status lights yellow
Either:
■
The Switch unit has failed its Power On Self Test (POST) because of an
internal problem. The fault type will be indicated on the unit LEDs.
Contact your supplier for advice.
or
■
A port has failed and has been automatically disabled. You can verify
this by checking that the Port Status LED is quickly flashing Yellow. If a
port fails the Switch passes its Power on Self Test and continues to
operate normally.
A Port Status LED is quickly flashing yellow
The port has failed and has been automatically disabled. The Switch
passes its Power On Self Test and continues to operate normally, even if
one or more ports are disabled.
The PSU LED lights red or flashing red
The PSU has failed or you may have a faulty power cord. Firstly, check
whether a temporary fault has occured by removing and replacing the
power cord connected to the PSU. If the problem still occurs, check the
power cord by:
■
testing it in another device