Allied Telesis AT-MMC6005, Руководство по установке

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AT-MMC6000 Series Installation Guide
31
Smart
MissingLink™
(SML)
SML Overview
If an Ethernet connection to one of the media converters loses link, the
Smart MissingLink™ (SML) feature allows you to determine which port still
has a valid Ethernet connection and which port requires troubleshooting.
The value to this type of network monitoring and fault notification is that
you can quickly determine which media converter’s port has failed and
pinpoint the specific area where the problem is occurring.
When the first media converter in a pair detects a loss of connection on the
second media converter’s copper port, the second media converter’s
copper port’s L/A LED is turned off. At the same time, the first media
converter copper port’s L/A LED blinks while simultaneously turning OFF
its Ethernet connection to its end node. This occurs even though the first
media converter’s port had a valid connection before the failure occurred.
The reason for this behavior is so that its end node connected to the
first media converter is notified that the Ethernet connection on the second
media converter is compromised, and immediate action is required to
resolve the issue.
SML Example
The following illustrations are examples of how SML behaves with two
SML enabled media converters connected back-to-back (bookend mode).
Figure 8 and Figure 9 show two AT-MMC6000 Series Media Converters
and end node L/A LED behavior with SML enabled under normal
conditions.
Figure 8 illustrates that all of the Ethernet links are operating properly and
all of the copper L/A LEDs are on.
Figure 8. SML in Normal Condition with Two Media Converters
DSL Cable
End Node
Link LED On
End Node
Link LED On
AT-MMC6000 Series
Copper L/A
LED On
DSL
Copper L/A
LED On
Copper Cable Copper Cable
DSL
Provider
AT-MMC6000 Series
Subscriber