Smart Missinglink™ (Sml); Sml Example Scenarios - Allied Telesis AT-DMC1000/SC Installation Manual

Smart
MissingLink™
(SML)
Table 1. Media Converter LED Functional Descriptions (Continued)
LED State
Off
Steady
Green
Rapid
Fiber Port
Blinking
LINK/ACT
Green
Slow
Blinking
Green
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 LINK/ACT LED is turned off. At the same time, the media
converter causes the opposite port's LINK/ACT 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 copper
port fails (as shown in Figure 5 on page 22), the fiber port's LINK/ACT LED
turns ON and OFF simultaneously with the fiber port's link going up and
down, and the fiber port's end node will detect its link going up and down.
The copper port's LINK/ACT LED is turned OFF, indicating a failed
connection on the copper port.
If the failure had started with the fiber-optic cabling (as shown in Figure 4
on page 22), then the copper port's LINK/ACT LED would blink slowly with
the copper port link down, and the fiber port's LINK/ACT LED would turn
OFF.

SML Example Scenarios

Following are example scenarios with one SML enabled media converter
connected between two end nodes.
AT-DMC1000/100 Series Desktop Mini Media Converter Installation Guide
The port has not established a link.
The port has an established link to a
network device, but it is not transmitting or
receiving network packets.
The port is transmitting or receiving
network packets.
SML is on and detects a failure on the
copper port or the remote copper port
when operating in a back-to-back
configuration with another AT-DMC1000
or AT-DMC100.
Description
21