B&B Electronics 855-11844--51 - Manual User Manual
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5
Link Fault Pass-Through (LFPT)
Link Fault Pass-Through (LFPT) is a troubleshooting feature that combines TX and FX
LinkLoss from both the local and remote McBasic-Gigabit modules. LFPT is enabled
by turning on both FX and TX LinkLoss on both modules. This feature allows either
end of the conversion to detect a link fault occurring at the other end of the media
conversion chain. FiberAlert can also be enabled at the main site.
If a cable fault occurs on the remote devices’ twisted pair port, then TX LinkLoss
detects the fault and disable the OPTICS port.
If a cable fault occurs on the remote devices fiber optics’ port, then FX LinkLoss
detects the fiber loss and disables the Twisted Pair port.
The link fault is passed through the media conversion and is observed at each end. It
acts just like it would if the devices were directly connected.
For more information on LinkLoss/FiberAlert, visit the B&B Electronics Web site at
http://www.bb-elec.com/Tech-Support.aspx
If unsure of how to implement these
features in a specific configuration, contact B&B Electronics Technical Support at
(800) 433-5109 (U.S./Canada), +353 91 792444 (Europe) or via e-mail at:
.
6
Additional Gigabit Features
Preferred/Forced Mode
In addition to Master/Slave Modes, McBasic-Gigabit module also includes
Preferred/Forced Modes for Master/Slave negotiation. Preferred Mode helps
determine whether the module should act as a Master or Slave. Forced Mode should
typically only be used when connecting to some legacy switches, or when there is
difficulty establishing a link. The default is Preferred Mode (S1-1 is ON).
Since most switches today typically
function as Masters, B&B Electronics
recommends configuring McBasic-Gigabit
as indicated in the table.
DIP
Switch
Feature
Setting
S1-1
Preferred/
Forced
ON
(Preferred)
FX Negotiation on McBasic-Gigabit
McBasic-Gigabit module includes the FX Auto Negotiation feature which negotiates
duplex mode. This feature must be enabled or disabled on both ends of the
connection or there may have difficulty establishing a link. If the device being
connected to the McBasic-Gigabit module does not support Auto Negotiation,
disabling the feature on the McBasic-Gigabit module forces the link up.
DIP Switch settings for FX AN:
DIP Switch
Setting
S1-5 FX
AN
=
ON