Fiber optic port, Mode selection button, Link test – Allied Telesis AT-MC1005/4 User Manual
Page 14: Missinglink

Overview
4
Fiber Optic Port
The 1000Base-SX port on the AT-MC1004 media converter has an SC
connector and is designed to operate with multimode fiber optic cabling. This
port has a maximum operating distance of 550 meters (1,804 feet) using 62.5/
125 micron multimode fiber optic cable.
The 1000Base-LX port on the AT-MC1005/x Series Media Converters has an
SC connector and is designed to operate with single-mode fiber optic cabling.
This port has a maximum operating distance of 10 kilometers (6.2 miles) to 70
kilometers (43.4 miles), depending on your model, using 9/125 micron single-
mode fiber optic cable.
Mode Selection Button
Link Test
The link test is a fast and easy way for you to test the connections between the
Gigabit Ethernet media 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 be able to focus your
troubleshooting efforts on the cable and end-node where the problem resides.
A link test is performed when the Mode Selection button is toggled until the
LT LED is green.
Note
Performing a link test does not interfere with a media converter’s ability
to pass network traffic.
MissingLink
The MissingLink feature enables the fiber optic ports on the Gigabit Ethernet
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 an end-node, the media converter shuts down the
connection to the other port, thus notifying the end-node that the connection
has been lost.