Allied Telesis AT-MCF2012LC/1 - Manual (Page 55)

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Chapter 3
Troubleshooting
This chapter contains suggestions on how to troubleshoot
the AT-MCF2012LC and AT-MCF2012LC/1 media
converter modules should a problem occur. For
suggestions on how to troubleshoot a problem with the
chassis, refer to the Installation Guide that ships with the
chassis.
Problem 1: Cables are connected to the ports on the
media converter module and the chassis is powered on,
but all of the port LEDs on the module are off.
Solution: Examine the LT, ML, and SML LEDs on the
module. One of the LEDs should be on, as well one of the
CH LEDs, even when no cables are attached to a module.
A failure of all the LEDs could mean that the module is not
receiving power or has failed. Try the following:
ˆ Remove the media converter module and reinstall it.
ˆ Determine whether the power supply in the chassis is
operating by listening for the fans. If the fans are not
operating, the problem is with the power supply. Refer
to the chassis’ Installation Guide for assistance in
troubleshooting a problem with the power supply.
ˆ Install the media converter module in another slot in
the chassis.
ˆ Replace the media converter module.
Problem 2: The two ports of a channel are connected to
networking devices, but the Link LEDs for the ports are off.
Solution: The first step to resolving a link problem
between the ports of a channel and the networking
devices is to set the operating mode of the channel to the
Smart MissingLink mode or the Link Test mode. These
modes allow you to use the Link LEDs to identify which
port in a channel is unable to establish a link to its
networking device. The operating mode of a channel is set
with the Mode Selection button, as explained in “Mode
Selection Button” on page 36.