7
TP/TX LinkLoss is another troubleshooting feature. When a fault occurs on the
twisted pair segment of a conversion, TP/TX LinkLoss detects the fault and
passes this information to the fiber segment. If a media converter is not receiving
a twisted pair link, TP/TX LinkLoss disables the transmitter on the media
converter's fiber port. This results in a loss of link on the device connected to the
fiber port.
FiberAlert
FiberAlert minimizes the problems associated with the loss of one strand of fiber.
If a strand is unavailable, the B&B Electronics device at the receiver end notes
the loss of link. The device will then stop transmitting data and the link signal
until a signal or link pulse is received. The result is that the link LED on BOTH
sides of the fiber connection will go out indicating a fault somewhere in the fiber
loop. Using FiberAlert, a local site administrator is notified of a fault and can
quickly determine where a cable fault is located.
NOTE
Enable FiberAlert only on one side of the media conversion; enabling it on both sides will
keep both transmitters off indefinitely.
Pulsing FiberAlert
Available on products 850-14940 through 850-14949 (board revision -10),
Pulsing FiberAlert minimizes the problems associated with the loss of one strand
of fiber. If a strand is unavailable, the B&B Electronics device at the receiver end
notes the loss of link. The device will then stop transmitting data and start
sending link pulses. Until a valid link is received, the fiber link LED will be OFF
on the device on the receiver side of the fiber strand with the fault while the fiber
link LED on the other unit will blink. Pulsing FiberAlert notifies a local site
administrator of a fault, allowing quick determination of where a cable fault
resides.
NOTE
Pulsing FiberAlert can be enabled on both sides of a conversion.
Using FiberAlert and LinkLoss
The following chart provides an overview of the troubleshooting features, their
functionality and the recommended settings for a pair of media converters in a
typical central/main site to remote site application:
FiberAlert and LinkLoss
Feature
Enabled
Fault Location
Disabled LEDs
FiberAlert
Remote Site Only
Fiber
Fiber
