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FA is used when connecting to a device that does not support FEF. If an FEF signal is
sent to a device that does not support FEF, the device acts as if there is still a good
connection. The FEF signal is mistaken for data. FA works similar to FEF, in that
when there is a fault in one direction of the fiber, it acts on the fiber in the opposite
direction. But unlike FEF, FA sends no signal. Because of this, FA can not be
enabled on both ends. If it is enabled at both ends and a fault occurs, FA will turn
signal off in the opposite direction; the device on the other side of the fiber will see
the loss of signal and engage FA, turning off signal. The net result will be the signal
turned off in both directions, even after the fault has been repaired.
It is highly recommended that only one is chosen, either FEF or FA. If both are
selected FA will take precedence over FEF.
Auto Negotiation on IE-iMcV-MediaLinX TX/SFP
IE-iMcV-MediaLinX TX/SFP modules include the feature Auto Negotiation. When
Auto Negotiation is enabled, the module negotiates as a 10/100 Mbps full-duplex
device. If the connected device can operate at 100 Mbps full-duplex, a link is
established. Auto Negotiation (DIP Switch #1) is enabled by default.
If the twisted pair port on the other device does not have the ability to Auto
Negotiate or a half-duplex connection is desired, then Auto Negotiation must be
disabled. The IE-iMcV-MediaLinX TX/SFP is capable of 10 Mbps (half and full duplex)
as well as 100 Mbps (half and full duplex).
The following diagram shows a typical application with three possible configurations.
Configure Auto Negotiation on an IE-iMcV-MediaLinX TX/SFP by adjusting the DIP
Switch setting (for unmanaged modules) or via the management software. Refer to
the DIP Switch table for switch location and settings.
If unsure of how to implement these features in a specific configuration, contact IMC
Networks Technical Support at (800) 624-1070 (U.S./Canada), +32-16-550880
(Europe) or via e-mail at: techsupport@imcnetworks.com.
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