Allied Telesis AT-GS2002 Series, Руководство по установке

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Chapter 1: Overview
22
MODE Push Button
The MODE push button is used to toggle between the three operation
modes: Link Test (LT), MissingLink (ML), and Smart MissingLink (SML).
This button is located on the front panel. The button cycles through these
three modes with each push.
To select between the three modes, use a pointed object such as a pen to
depress the push button.
Link Test
The link test is a fast and easy way for you to test the connections
between the bridging converter ports 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.
To perform a link test, toggle the MODE selection button until the LT LED
is green. The LINK LEDs for the ports should now be green, indicating
that they were able to establish a link with their end-nodes. If a LINK LED
is off, the port could not establish a link. Refer to “Troubleshooting” on
page 33 for suggestions on how to remedy the problem.
Note
Performing a link test does not interfere with a bridging converter’s
ability to pass network traffic.
MissingLink
The MissingLink feature enables the ports on the bridging converter to
pass the “Link” status of their connections to each other. When the
bridging converter detects a problem on one of the ports, such as the loss
of connection to an end-node, the bridging converter shuts down the
connection to the other port, thus notifying the end-node that the
connection has been lost.
For example, if the twisted pair cable to the 10/100/1000Base-TX port on
the bridging converter were to fail, the unit would respond by dropping the
link on the 1000Base-FX fiber optic port. In this way, the bridging
converter 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