4
5
L
I N K
F
A U L T
D
E T E C T I O N
F
E A T U R E
Link Fault Detection
is only available when using
Force-10
or
Force-100
mode; it is not available in
Auto-Negotiation
mode. When LFD is enabled and
the input link is down at one interface to the
10/100 Autosensing Media
Converter
, the transmitter output on that interface is turned off for about
425ms every 3.8 seconds (i.e. blinking). It applies to both network interfaces
and to both data rates. If the link at the other interface to the
10/100
Autosensing Media Converter
is also down, there is no output. LFD causes the
Link Up indicator of the link partner to blink.
When the
10/100 Autosensing Media Converter
is in one of the
Force
modes, enable LFD by setting
S5
to the
ON
position. Disable LFD (default) by
setting
S5
to the
OFF
position. In order for LFD to function properly, Force
mode must be enabled by setting
S7
to
ON
with either
S8 ON
for 10 Mbps or
S8 OFF
for 100 Mbps. NOTE:
S6
must also be ON when enabling LFD.
T
W I S T E D
P
A I R
C
R O S S O V E R
/ P
A S S
- T
H R O U G H
S
W I T C H
The
10/100 Autosensing Media Converter
features a crossover/pass-through
push-button switch, located on the faceplate next to the RJ-45 connector, to
set the twisted pair connection type (see page 1 for illustration of location).
Select a pass-through connection by pressing the push-button IN. A cross-
over connection is selected when the push-button is OUT. If you are not sure
which connection is needed, set the push-button to whatever setting makes
the twisted pair LNK (link) LED glow.
LED Indicators
The
10/100 Autosensing Media Converter
features several diagnostic LEDs
per port. The LED functions for the media converter are:
T
W I S T E D
P
A I R
P
O R T
LNK
Glows green when a twisted pair
link
is established.
ACT
Glows yellow when data is detected on the port.
100
Glows yellow when
100 Mbps
data is detected on the port.
LFD
Glows green when
Link Fault Detection
is enabled.
(
NOTE
: This feature is only available when either Force -10 or Force-100 mode is
enabled. Refer to the LFD LED Activity section for more information.
)
AN
Glows green when
Auto-Negotiation/PNP
mode is enabled.
PWR
Glows green when unit has
power
.
N
OTE
When using the LFD feature, if the DIP switches are in any other combination than
listed above, your 10/100 media converter may exhibit erratic behavior.
F
I B E R
P
O R T
100
Glows yellow when
100 Mbps
data is detected on the port.
ACT
Glows green when data is detected on the port.
LNK
Glows green when a fiber
link
is established.
L
I N K
F
A U L T
D
E T E C T I O N
L E D A
C T I V I T Y
When LFD is enabled and a fault occurs on a segment of the media
conversion, the various Link LEDs in that conversion will either blink or
extinguish. LEDs may react differently depending on the type of end devices
in the conversion, whether the
10/100 Autosensing Media Converter
is in
Force-10
or
Force-100
mode, where the fault occurs, etc. For questions,
please contact Technical support.
Installation Troubleshooting
•
During installation, first test the fiber and twisted pair connections with all
troubleshooting features disabled, then enable these features, if desired, just
before final installation. This will reduce the features’ interference with
testing.
•
When working with units where the features cannot be disabled, you must
establish BOTH your twisted pair and fiber connections before the link LEDs
will light!
•
To test a media converter by itself, first make sure you have an appropriate
fiber patch cable, then follow these steps to test:
SStteepp 11::
Connect the media converter to the twisted pair
device with a twisted pair cable.
SStteepp 22::
Loop a single strand of fiber from the transmit port to
the receive port of your media converter.
SStteepp 33::
Verify that you have both twisted pair and fiber link (see
LED Operation section, page 4)) on your media converter.
NOTE: Use caution when conducting a loopback test; it is possible to
create a network loop if connecting the media converter’s twsited pair port
to an active network. IMC Networks recommends connecting the twisted
pair cable to a PC when performing this type of test.
•
Make sure to use the appropriate twisted pair cable, and have the
crossover/pass-through switch set correctly if your media converters do not
include
AutoCross.
N
OTE
Twisted pair AND fiber optic cables must be connected, and the twisted pair crossover/
pass-through switch set correctly, before either LNK LED will glow solid.
