Solving Problems Indicated By Leds; Solving Hardware Problems - 3Com SuperStack 3 4900 SX Getting Started Manual

22 C 2: I
HAPTER NSTALLING THE
Solving Problems
Indicated by LEDs
Solving Hardware
Problems
S
WITCH
If the LEDs on the Switch indicate a problem, refer to
which contains a list of problems and suggested solutions.
Table 8 Problems Indicated by LEDs
Problem
The Power LED does
not light
On powering-up, the
Power/Self Test LED
lights yellow.
A link is connected and
yet the Status LED for
the port does not light
In the rare event of your Switch unit experiencing a hardware failure,
refer to Table 9.
Suggested Solution
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.
The relevant Switch unit has failed its Power On Self Test
(POST) because of an internal problem. Contact your
supplier for advice.
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.
The quality of cable is satisfactory.
Table 8 below,