Allied Telesis AT-MCF2012LC/1 - Manual (Page 57)

AT-MCF2012LC and AT-MCF2012LC/1 Media Converter Modules Installation Guide
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specifications, refer to “100Base-FX Fiber Optic Port
Specifications” on page 63.
ˆ Verify that the correct type of fiber optic cabling is being
used. For specifications, refer to “Fiber Optic Ports” on
page 22 or “100Base-FX Fiber Optic Port
Specifications” on page 63.
ˆ Verify that the correct fiber optic cable is connected to
the port in the channel. This is to eliminate the possibility
that an unused fiber optic cable was inadvertently
connected to the port or that the cable is connected to
the wrong remote networking device, such as a
powered off device. For background information, refer to
“Media Converter Channels” on page 19.
ˆ Try connecting another networking device to the fiber
optic port using a different cable. If the twisted pair port
is able to establish a link, then the problem is with the
cable or the other networking device.
ˆ If you installed the optional management module in the
chassis, use the management software to verify that the
port is enabled.
ˆ If the remote networking device is a management
device, use its management firmware to determine
whether its port is enabled.
ˆ Test the attenuation on the fiber optic cable with a fiber
optic tester to determine whether the optical signal is too
weak (i.e., sensitivity) or too strong (i.e., maximum input
power). The specifications of the fiber optic ports on the
media converter module can be found in “100Base-FX
Fiber Optic Port Specifications” on page 63.
Problem 5: The Link LEDs for the two ports of a channel
are on but the networking devices are unable to forward
traffic to each other through the channel.
Solution: Try the following:
ˆ Verify that the twisted pair and fiber optic cables from
the two networking devices are connected to ports of
the same channel. This is to eliminate the possibility that
the devices were inadvertently connected to ports in
different channels. For background information, refer to
“Media Converter Channels” on page 19.
ˆ If the networking devices are managed devices, use
their management firmware to determine whether they
are configured and operating properly.