IMC Networks McBasic TX/FX Installation Manual page 3

copper and fiber transmitters, but normally has no way of knowing whether
the cable to the other device is intact and the link pulses are reaching the
other end. FiberAlert and LinkLoss allow this information to be obtained from
the fiber, even when physical access to a remote device (and its link integri-
ty LED) is not available.
W I F X L
H A T S
FX LinkLoss is a troubleshooting feature. When a fault occurs on the fiber
segment of a conversion, FX LinkLoss detects the fault and passes this infor-
mation to the twisted pair segment. If a media converter is not receiving a
fiber link, FX LinkLoss disables the transmitter on the media converter's twist-
ed pair port. This results in a loss of link on the device connected to the
twisted pair port.
W I T X L
H A T S
TX LinkLoss is another troubleshooting feature. When a fault occurs on the
twisted pair segment of a conversion, TX LinkLoss detects the fault and pass-
es this information to the fiber segment. If a media converter is not receiv-
ing a twisted pair link, TX LinkLoss disables the transmitter on the media con-
verter's fiber port. This results in a loss of link on the device connected to the
fiber port.
W I F
H A T S
FiberAlert minimizes the problems asso-
ciated with the loss of one strand of fiber.
If a strand is unavailable, the IMC Networks
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. (To enable, see page 4).
FiberAlert should only be enabled on ONE side of a media conversion.
Enabling it on both sides would keep both transmitters off indefinitely.
U F
S I N G I B E R
The following table provides an overview of the troubleshooting features,
their functionality and the recommended settings for a pair of media con-
verters in a typical central/main site to remote site application:
L
I N K
Feature
FX LinkLoss
TX LinkLoss
FiberAlert
L
I N K O S S
L
I N K O S S
A ?
I B E R L E R T
A
L E R T A N D
L / F A
O S S I B E R
Fault Location
Fiber
Twisted Pair
Fiber
?
?
Local Link LED is OFF indicating a break in the fiber loop
L L
I N K O S S
C
L E R T O M P A R I S O N
Disabled LEDs
Twisted Pair
Fiber
Fiber
3
Local Site
Cable Break
XMT
RCV
LED
LED OFF = Broken Link
IMC Networks product with FiberAlert
Remote Site stops transmitting
T
A B L E
Enable At:
Main Site Only
Remote Site Only
Remote Site Only
Remote Site
RCV
XMT
LED
enabled —