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NML/LNK TST Button

The NML/LNK TST (Normal MissingLink/Link Test) button allows you to

perform a link test on the ports on the media converter. This button also allows

you to activate the MissingLink feature on the unit. The MissingLink and Link

Test features are describe below.

MissingLink. The MissingLink feature activates 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 node, the media converter shuts down the connection to the

other port, thus notifying the node that the connection has been lost.

For example, if the network twisted pair cable to the AT-MC14 were to fail, the

media converter 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 media converter 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, and so alert the network administrator of the problem.

Note

The MissingLink feature is disabled when you perform a link test with

the NML/LNK TST button. Consequently, to ensure that the

MissingLink feature is activated on the media converter, always set the

button to the NML (IN) position during normal network operations.

Link Test. A link test is a fast and easy way for you to test the connections

between the ports on the media converter and the end-nodes that are connected

to the ports. If a network problem occurs, you can perform a link test to

determine which port is experiencing a problem, and so be able to focus your

troubleshooting efforts on the cable and end-node where the problem resides.

A link test is performed when the NML/LNK TST button is in the LNK TST

(OUT) position.

Note

Performing a link test does not interfere with a media converter’s ability

to pass network traffic.

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