Allied Telesis MMC10G Series, Installation Manual

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MMC10G Series Mini Media Converter Installation Guide
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Enabling SML
To enable SML on the unit, set the SML ON/OFF DIP switch on the rear
panel of the unit to the ON (up) position. See Figure 15.
Figure 15. SML and Loopback DIP Switch
Guidelines to the
LED Modes
Here are the guidelines to using the LED modes:

The default is the Smart MissingLink mode.

The LED modes do not block or interfere with the flow of traffic
between the two ports during normal network operations.

Smart MissingLink and Regular modes are useful in identifying
ports that cannot establish links to network devices or have lost
links. In Smart MissingLink mode, if only one port has a link to a
network device, the LED for the port that lost link will be off, while
the LED for the port that had a valid link will blink once a second. In
contrast, if the media converter is set to Regular mode, and only
one port has a link to a network device, its Link LED will be on
while the Link LED on the port with no link will be off.
Note
The MMC10GT/SP cannot link in 1G mode unless both ports have
valid link partners

The Smart MissingLink mode can also be useful in situations
where both network devices connected to the ports can react to the
loss of a link by performing specific actions, such as sending
SNMP traps or seeking a redundant path.
Loopback ON/OFF
SML ON/OFF