Allied Telesis AT-MC106XL - Manual (Page 9)

AT-MC105XL and AT-MC106XL Installation Guide
3
NML/LNK TST Switch
The NML/LNK TST (Normal/Link Test) switch, located on the front panel,
establishes a fiber/twisted pair link in the test position.
The default position of the switch is IN, which is the normal (NML) operating
mode and enables the MissingLink feature. With the switch in the OUT or
Link Test Mode (LNK TST) position, the MissingLink feature is disabled and
the optical transmitter TX is forced on. The NML LED lights when the NML/
TST LNK switch is in the default (IN) operating position.
Note
Using the Link Test Mode does not interfere with the media converter’s
ability to pass network traffic.
Auto-Negotiation
The 100Base-TX ports participate in IEEE 802.3u Standard auto-negotiation
with its local link partner.
Note
End stations used with the media converter must operate in the same
duplex mode (either both full-duplex or both half-duplex).
Note
The media converters have an additional feature, allowing the unit to
operate in 100 Mbps half-duplex mode. Certain applications require this
mode, for example two media converters installed in a back-to-bac
configuration (fiber-to-fiber) which are attached to unmanaged repeaters
and/or switches that auto-negotiate with the other. For instructions on how
to set up the media converter for this application, visit the Technical
Support area of Allied Telesyn’s web site at www.alliedtelesyn.com.
MissingLink

MissingLink gives the host (router, server, switch) attached to each end of the
converter critical information about the status of the other (remote) segment
link. If either link fails, the converter interacts with both hosts, making each
instantly aware of the link fault. Either host can then execute
preprogrammed, redundant transmission path selection.