Allied Telesis AT-PBC18 - Manual (Page 47)

PowerBlade PBC18 Installation Guide
47
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 a AT-PB101 were to fail,
the module would respond by dropping the link on the fiber optic port.
In this way, the AT-PB101 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
MissingLink/Link Test feature. Consequently, to ensure that the
MissingLink is enabled on the media converter, always set the
ML/LT to the ML position during normal network operations.