Installation Guide

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Auto-Negotiation, Duplex Mode, and Speed
This feature allows either end of the conversion to detect a link fault occurring at the
other end of the media conversion chain, as follows:
 A cable fault occurs on the remote twisted pair.
 TX LinkLoss detects the fault and disables the OPTICS (or UPLINK) port.
 FX LinkLoss detects the fiber loss and disables the DATA port.
The link fault is passed through the media conversion and is observed at each end. It
acts just as it would if the devices were directly connected.
Note: FiberAlert can also be added to the remote side of the pair to further assist in
locating a fault.
Loopback Testing
The Mini FiberLinX-II includes Loopback testing functionality, which loops back all
frames arriving on the optics port (except for the device’s management traffic).
When in Loopback mode, the Mini FiberLinX-II drops the link on the twisted pair
port.
Another form of Loopback testing, called Source/Destination (Src/Dest) Address
Swap, swaps the frame’s MAC Address. This test mode is set from the Unit screen in
the serial/Telnet session or from PrismaView.
Note: This test mode can cause a frame with a multicast source address to be
created, which violates the IEEE standard. Select only clear multicast bits.
For more information, see the
Unit Control Settings section of Using the Main
Configuration Screen
(on page 30) or consult the PrismaView help file.