Allied Telesis AT-MC13 - Manual (Page 18)

Chapter 1: Overview
18
NORMAL/LNK TST Button
The AT-MC13 media converter features a NORMAL/LNK TST (Normal
MissingLink/Link Test) button, shown in Figure 5. The 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. This button sets
the fiber port into an artificial link transmission state for testing without the
twisted pair port being connected.
When the NORMAL/LNK TST button is in the IN (default) position, the
NORMAL LED is green indicating that the media converter is functioning
normally. For a link test, set the switch in the OUT position. Be sure to set
the switch back to the default position after performing a link test. If the
switch is left in the OUT position, the media converter will not function
properly..
Figure 5. NORMAL/LNK TST Switch
The MissingLink and Link Test features are described below.
MissingLink
The MissingLink feature allows 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 twisted pair cable to the AT-MC13 were to fail, the
media converter would respond by dropping the link on the fiber optic
port. In this way, the AT-MC13 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.
AT-MC13 ETHERNET MEDIA CONVERTER
NORMAL
LNK TST
10Base-FL 10Base-T TX RX
MDI MDI-X
PWR
NORMAL
REC
LINK
REC
LINK
CLASS 1
LED PRODUCT
1204
NORMAL
LNK TST