3com 4900 sx Quick Setup Guide
22
C
HAPTER
2: I
NSTALLING
THE
S
WITCH
Solving Problems
Indicated by LEDs
Indicated by LEDs
If the LEDs on the Switch indicate a problem, refer to
below,
which contains a list of problems and suggested solutions.
Table 8 Problems Indicated by LEDs
Solving Hardware
Problems
Problems
In the rare event of your Switch unit experiencing a hardware failure,
refer to
refer to
Problem
Suggested Solution
The Power LED does
not light
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.
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.
Power/Self Test LED
lights yellow.
The relevant Switch unit has failed its Power On Self Test
(POST) because of an internal problem. Contact your
supplier for advice.
(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
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 devices at both ends of the link have the same
auto-negotiation setting, i.e. both enabled, or both
disabled.
auto-negotiation setting, i.e. both enabled, or both
disabled.
■
The quality of cable is satisfactory.
17702ua.bk Page 22 Friday, April 6, 2001 3:31 PM