Allied Telesis AT-CM70S - Manual (Page 84)

Chapter 3: Troubleshooting
84
LK LED is OFF If the LK LED for the twisted pair port on a line card is OFF, do the
following:
ˆ Check that the end-node connected to the port is powered ON and is
operating properly.
ˆ Check that the twisted pair cable is securely connected to the twisted
pair port on the switch and on the end-node.
ˆ Make sure that the twisted pair cable does not exceed 100 meters
(328 feet) and that you are using a Category 5 or better cable.
ˆ Check for MissingLink™ option.
If the LK LED for the fiber optic port on a line card is OFF, do the following:
ˆ Verify that the end-node connected to the port is ON and is operating
properly.
ˆ Check that the fiber optic cable is securely connected to the fiber optic
port on the media converter and on the end-node.
ˆ Check to be sure that the end-node connected to the port is operating
at the same port speed.
ˆ Verify the fiber connections are correct that is the converter’s TX port
is connected to the end node’s RX port, and the converter’s RX port is
connected to the end node’s TX port.
ˆ Check to be sure that the end-nodes connected to the switch are
operating at the same duplex mode.
ˆ Test the attenuation on the fiber cable to ensure that it does not
exceed acceptable values.
ˆ Verify that you are using the appropriate type of fiber optic cables and
that you have not exceeded the maximum operating distances.
ˆ Check that the operating specifications of the fiber optic port on the
end-node are compatible with the operating specifications of the fiber
optic port on the converter.
LK LED is
Flashing
If the LK LEDs for the fiber optic ports on two AT-CV102 line cards are
flashing when they are operating back-to-back in SML mode, do the
following:
ˆ Unplug the twisted pair port on either of the two AT-CV102's for at least
20 seconds, then re-insert it.
If you are still experiencing problems after testing and troubleshooting the
installation, contact Allied Telesis Technical Support for assistance. Refer
to “Contacting Allied Telesis” on page 14 or visit our web site at
www.alliedtelesis.com for support information.