Allied Telesis AT-MC16 - Manual (Page 17)

AT-MC1x Series Installation Guide
7
MissingLink
The MissingLink feature enables the ports on the media converter to pass the
“Link” status of their connections to each other. When the media converter
detects a problem with one of the ports, such as the loss of connection to a end-
node, the media converter shuts down the connection to the other port, thus
notifying the end-node that the connection has been lost.
For example, if the network twisted pair cable on an AT-MC14 were to fail, the
module would respond by dropping the link on the fiber optic port. In this way,
the AT-MC14 notifies the end-node connected to the fiber optic port that the
connection on the twisted pair port has been lost. If the failure had started with
the fiber optic cabling, the unit would drop the link to the twisted pair port.
The value to this type of network monitoring and fault notification is that some
hubs and switches can be configured to take a specific action in the event of the
loss of connection on a port. In some cases, the unit can be configured to seek a
redundant path to a disconnected end-node or send out a trap to a network
management station, alerting the network administrator of the problem.
Note
MissingLink is disabled when you perform a link test with the Fiber
Link Test switch. Consequently, to ensure that MissingLink is enabled
on the media converter, always set the Fiber Link Test switch to the
DOWN position during normal network operations.