Allied Telesis AT-IMC2000T/SC, Руководство по установке

Страница: 18 / 58

IMC2000/200 Series Media Converter Installation Guide
18
Smart MissingLink™ (SML)
If one of the Ethernet connections to the media converter loses link, the
Smart MissingLink™ (SML) feature allows you to determine which port still
has a valid 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 port has failed and troubleshoot
the specific area where the problem is occurring.
When the media converter detects a loss of connection on one of the
ports, the port’s L/A LED is turned off. At the same time, the media
converter causes the opposite port’s L/A LED to blink while simultaneously
turning OFF that port’s Ethernet connection to its end node. This occurs
even though the properly operating port had a valid connection before the
failure occurred: The reason for this is so that its end node is notified that
the data path has been compromised, and immediate action is required.
For example, if the network connection to the media converter’s twisted-
pair port fails, the FIBER P2 L/A LED blinks slowly while its link is turned
OFF. The COPPER P2 L/A LED is turned OFF, indicating a failed
connection on the twisted-pair port. If the failure had started with the fiber-
optic cabling, then the COPPER P2 L/A LED would blink slowly, and the
FIBER P2 L/A LED would turn OFF.
SML Example
Scenarios
Following are example scenarios with one SML enabled media converter
connected between two end nodes.
Figure 5 shows media converter and end node L/A LED behavior with
SML enabled under normal conditions.
Figure 5. SML in Normal Condition
Figure 6 shows media converter and end node L/A LED behavior with
SML enabled with a fiber connection down.
IMC2000/200
Copper L/A Fiber L/A
End Node
Copper Cable Fiber Cable
Link LED On
End Node
Link LED On
LED On LED On
Media converter
IMC2000/200
Copper L/A Fiber L/A
End Node
Copper Cable Fiber Cable
Link LED Off
End Node
Link LED Off
LED Blinking LED Off
Media converter