6
11
unshielded twisted pair link segment. Remove the jumper shunt or place it
on only one pin to select an unshielded twisted pair link segment (factory
default). Place the jumper shunt over both pins to select a shielded twisted
pair link segment.
NOTE: This jumper is not found on -40 10Mbps module boards.
About LinkLoss and FiberAlert
10Mbps
and
100Mbps Modules
include the following features:
•
FO/FX LinkLoss
(a.k.a. "
Fiber LinkLoss
" or "
LinkLoss
")
•
TP/TX LinkLoss
(a.k.a. "
Twisted Pair LinkLoss”
or "
Reverse LinkLoss”
)
•
FiberAlert
FiberAlert
and
LinkLoss
are advanced troubleshooting features that can
help you locate "silent failures" on your network. However, it is vital that you
understand exactly how
FiberAlert
and
LinkLoss
work, and how they will
react in your network configuration, before attempting to install the enclosed
module(s).
Installing modules without understanding the effects of
FiberAlert
and
LinkLoss
can cause perfectly functioning units to appear flawed or
even dead
.
A
B O U T
L
I N K
I
N T E G R I T Y
During normal operation, link integrity pulses are transmitted by all point-
to-point Ethernet devices. When a Black Box media converter receives valid
link pulses, it knows that the device to which it is connected is up and send-
ing pulses, and that the copper or fiber cable coming from that device is
intact. The appropriate “LNK” (link) LED is lit to indicate this.
The Black Box media converter also sends out link pulses from its 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. The combination of
FiberAlert
and
LinkLoss
allows this information to
be obtained, even when physical access to a remote device (and its link
integrity LED) is not available.
W
H A T
I
S
F O / F X L
I N K
L
O S S
?
FO/FX LinkLoss
is a troubleshooting feature. When a fault occurs on the
fiber segment of a conversion,
FO/FX LinkLoss
detects the fault and passes this
information to the twisted pair segment. If a media converter is not receiv-
ing a fiber link,
FO/FX LinkLoss
disables the transmitter on the media con-
verter's twisted pair port. This results in a loss of link on the device con-
nected to the twisted pair port.
LEDs on 10Mbps Modules with BNC ports
The LED function on
10Mbps Modules with BNC ports
is as follows:
TP L
INK
Glows green when link is established on the TP port
.
A
CTIVITY
Glows amber when data is being passed on the TP port.
LEDs on 100Mbps Modules (-20 and -50)
The LED functions on
100Mbps Modules
are as follows:
FX L
INK
Glows green when link is established on the FX port.
FX A
CTIVITY
Glows amber if data is being passed on the FX port.
TX P
AIR
L
INK
Glows green if link is established on the TX port.
TX A
CTIVITY
Glows amber when data is being passed on the TX port.
LEDs on Gigabit and 100Mbps Modules (-00)
The LED functions on
Gigabit
and
100Mbps Modules
(-00) are as follows:
LEDs on 10/100 Switching Modules
The LED functions on
10
/
100 Mbps switching modules
are as follows:
FX L
INK
/ACT
Glows green when link is established on the FX port;
blinks green when activity is detected on the port
TX L
INK
/ACT
Glows green when link is established on the TP/TX port;
blinks green when activity is detected on the port
