3Com Switch SuperStack II User Manual

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Solving Problems Indicated by LEDs 31
Solving Problems
Indicated by LEDs
If the LEDs on the Switch indicate a problem, refer to Table 5 which
contains a list of known problems and suggested solutions.
For information about solving problems when managing the Switch, refer
to the Problem Solving chapter in the “SuperStack II Switch Management
Guide” (DUA1695-0BAA0x).
Table 5
Known problems indicated by LEDs
Known Problem Suggested Solution
A Power LED does not
light
Check that the power cable is firmly connected to the
relevant Switch unit and to the supply outlet. If the
connection is secure and there is still no power, you may
have a faulty power cord.
On powering-up, the
Power/Self Test LED
lights yellow and Unit
LED lights green
The relevant Switch unit has failed its Power On Self Test
(POST) because of an internal problem. Contact your
supplier for advice.
An Expansion Module
Status LED flashes yellow
An unrecognized Expansion Module is installed into the
relevant Switch unit. You may need to remove the
Module, or upgrade the management software used by
the Switch to a version that recognizes the Module.
Contact your supplier for further advice.
A link is connected and
yet the Status LED for the
port does not light
Check that:
■
All connections are secure.
■
The devices at both ends of the link are powered-up.
■
Tx fiber cables are connected to remote Rx sockets,
and Rx fiber cables are connected to remote Tx
sockets.
■
The connection uses cross-over cable if you are
linking a 10BASE-T or 100BASE-TX port with a device
that is MDIX-only.
The Packet LED for an
Expansion Module is
flashing even though
there is no external traffic
on this link
If you have a Matrix Module installed into your Switch,
this is normal operation. Management software in the
stack passes packets between units even if there is no
other traffic activity.
16982ug1.bk Page 31 Thursday, April 29, 1999 4:51 PM

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