3Com 16985ua.bk - Manual (Page 31)

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 problems and suggested solutions.
For information about solving problems when managing the Switch, refer
to the Problem Solving chapter in the “SuperStack Switch Management
Guide”.
Table 5 Problems indicated by LEDs
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 a
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.
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.
■
The connection uses cross-over cable if you are
linking a 10BASE-T or 100BASE-TX port with a device
that is MDIX-only.
16985ua.bk Page 31 Thursday, September 7, 2000 9:15 AM