Allied Telesis AT-MCF2300 - Manual (Page 148)

Chapter 23: Troubleshooting the Modules
148 Section II: Installation
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If you installed the optional management module, use the
management software to verify that the port is enabled.
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If the remote network device is a management device, use its
management firmware to determine whether its port is enabled.
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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 AT-MCF2012LC and AT-MCF2012LC/1 Modules
are listed in “100Base-FX Fiber Optic Ports” on page 175.
Problem 6: The Link LEDs for the two ports of a channel are on but the
network devices are not forwarding traffic to each other through the
channel.
Solution: Try the following:
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Verify that the twisted pair and fiber optic cables from the two network
devices are connected to ports in 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 34.
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If the network devices are managed devices, use their management
firmware to determine whether they are configured and operating
properly.
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If the network devices are using a spanning tree protocol, the ports on
the devices may have been placed in the standby mode if the path is a
redundant path.
Problem 7: Two network devices are forwarding traffic through a channel
of the media converter module, but performance is slow.
Solution: Try the following:
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There might be a duplex mode mismatch between the twisted pair port
in the channel and the network device connected to the port. This
occurs when a twisted pair port using Auto-Negotiation is connected to
a device with a fixed duplex mode of full duplex. If this is the cause of
the problem, adjust the duplex mode of the port on the network device
or the media converter module so that both ports are using the same
duplex mode.
❒
The two network devices connected to the ports in the channel are
operating with different duplex modes. As explained in “Guidelines to
Using the Media Converter Modules” on page 53, the performance of
a channel is enhanced when its two network devices and its two ports
all use the same duplex mode.
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There could be an intermittent problem with one of the network
devices connected to the ports in the channel or with a cable. To
determine if this is the problem, set the channel to the Link Test mode