Allied Telesis AT-MMC1000/SP, Installation Manual

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Chapter 3: Troubleshooting
40
Problem 4:
The twisted-pair port on the media converter is connected to
an end node, but the port’s COPPER P1 L/A LED is off.
Solutions: The port is unable to establish a link to an end node. Try the
following:

Verify that the end node connected to the twisted-pair port is
powered on and is operating properly.

Verify that the twisted-pair cable is securely connected to the port
on the media converter channel and to the port on the remote end-
node.

Verify that the port is connected to the correct twisted-pair cable.
This is to eliminate the possibility that the port is connected to the
wrong end-node, such as a powered-off device.

Try connecting another end node to the twisted-pair port with a
different cable. If the twisted-pair port is able to establish a link,
then the problem is with the cable or the other end-node.

Verify that the twisted-pair cable does not exceed 100 meters (328
feet).

Verify that the end node connected to the media converter is
operating at the same speed.

Verify that you are using the appropriate category of twisted-pair
cable: Category 5 or Category 5E.
Note
A 1000Base connection may require 5 to 10 seconds to establish a
link.
Problem 5: The FIBER P2 L/A LED for the fiber-optic port is off.
Solutions: The fiber-optic port on the transceiver is unable to establish a
link to an end node. Try the following:

Verify that the end node connected to the fiber-optic port is
operating properly.

Verify that the fiber-optic cable is securely connected to the port on
the media converter channel and to the port on the remote end-
node.

Verify that the end node connected to the media converter is
operating at the same speed.

Check that the SFP module is fully inserted in the slot.