Solving Problems Indicated By Leds - 3Com SuperStack 3 Switch 4400 Series Getting Started Manual

56 C 4: P
HAPTER ROBLEM
Solving Problems
Indicated by LEDs
S
OLVING
If the LEDs on the Switch indicate a problem, refer to the list of suggested
solutions below.
The Power 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
■
then contact your supplier for advice.
On powering-up, the Power/Self Test LED 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 LED 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 LED 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.
A link is connected and yet the Status LED for the port does not
light
Check that:
The Switch and the device at the other end of the link (or cable) are
■
connected securely.
The devices at both ends of the link are powered-up
■
The quality of cable is satisfactory
■