2
TX/SSFX Single-Strand Fiber
SNMP-Manageable Media
Conversion Modules
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.
TX LinkLoss
and
FX 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 X L
I N K
L
O S S
?
When a fault occurs on the fiber segment of a conversion,
FX LinkLoss
detects the fault and passes this information to the twisted pair segment. If a
media converter is not receiving a fiber link,
FX LinkLoss
disables the trans-
mitter on the media converter's twisted pair port. This results in a loss of link
on the device connected to the twisted pair port.
W
H A T
I
S
T X L
I N K
L
O S S
?
When a fault occurs on the twisted pair segment of a conversion,
TX
LinkLoss
detects the fault and passes this information to the fiber segment. If
a media converter is not receiving a twisted pair link,
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.
C
O N F I G U R I N G A N D
U
S I N G
T X
A N D
F X L
I N K
L
O S S
TX/SSFX Modules
ship from the factory with
TX LinkLoss
and
FX LinkLoss
disabled. See the configuration chart on page 2 for instructions on enabling/
disabling these features. In a typical main site to remote site media conver-
sion, Black Box recommends you enable your media converters’ trou-
bleshooting features as follows:
•
FX LinkLoss:
Main Site
•
TX LinkLoss:
Remote Site
This will ensure that any faults, no matter where they occur, can be
detected by an administrator located at the main site.
Auto-Negotiation on TX/SSFX Modules
TX/SSFX Modules
include the feature
Auto-Negotiation
. When
Auto-
Negotiation
is enabled, the module negotiates as a 100 Mbps Full-Duplex
device; if the device the
TX/SSFX Module
is connected to can operate at 100
Mbps Full-Duplex, a link will be established. If the twisted pair port on the
other device does not have the ability to auto-negotiate, or if a 100 Mbps
Half-Duplex connection is desired,
Auto-Negotiation
on the
TX/SSFX Module
must be disabled. Half- and Full-Duplex settings must be manually set and
match on both devices the
TX/SSFX Module
is connected to.
Dual wavelength, single-strand fiber
TX/SSFX
Media Converters from Black
Box perform a 100 Mbps Fast Ethernet copper to fiber conversion and allow
two wavelengths to share one fiber strand — Full-Duplex data travels on dif-
ferent wavelengths (1310 nm and 1550 nm) — doubling the capacity of
installed fiber.
TX/SSFX Modules
are IEEE 802.3 100Base-TX and 100Base-FX
Fast Ethernet compliant and install in any SNMP-manageable
High Density
Media Converter System II
chassis or any
SNMP Manageable Media Converter
chassis from Black Box. Refer to your chassis’ manual for more information.
LMC5112C TX/SSFX SM-SC Matched Module Set
contains the following
two modules:
LMC5113C: TX/SSFX SM-SC (1310xmt/1550rcv)
LMC5114C: TX/SSFX SM-SC (1550xmt/1310rcv)
LMC5115C TX/SSFX SM/PLUS-SC Matched Module Set
contains the
following two modules:
LMC5116C: TX/SSFX SM/PLUS-SC (1310xmt/1550rcv)
LMC5117C: TX/SSFX SM/PLUS-SC (1550xmt/1310rcv)
Configuration Instructions
Following are instructions for configuring both managed (via an SNMP-
compatible management application like
iView
) and unmanaged modules.
M
A N A G E D
M
O D U L E S
In order to manage one or more
TX/SSFX Modules
, an SNMP agent must be
present:
Media Converter System II
chassis include embedded management;
other SNMP-manageable media converters require a
Master Module
. When
configuring managed modules, install the module first (see page 4 for instruc-
tions), then configure it using the management software Within
iView for
iMediaConverters (iView for iMc)
, troubleshooting and other features are con-
figured in the Module Detail section under the picture of the module. See the
iView for iMc
online help file for more information.
Management software will override any hardware settings (e.g., jumper, switch, etc.), so you MUST config-
ure a module that will be managed via the software. Until a module installed in a managed chassis is con-
figured via the software, the module (and its LEDs) may not work properly.
N O T E
U
N M A N A G E D
M
O D U L E S
Before installing,
TX/SSFX Modules
may be configured for
LinkLoss
and
Auto-
Negotiation
. The diagram below shows the location of the DIP switch and
jumpers on
TX/SSFX Modules
.
DIP Switch and Jumper Settings for TX/SSFX Modules
Twisted Pair Crossover/Pass-Through Connection
TX/SSFX
Modules include
AutoCross
, a feature which automatically selects
between a crossover workstation or pass-through/repeater hub connection
depending on the connected device.
Note: a MDI/MDI-X switch is not required.
About FX and TX LinkLoss
TX/SSFX Modules
include the following troubleshooting features:
•
FX LinkLoss
•
TX LinkLoss
These are advanced troubleshooting features that can help you locate "silent
failures" on your network. However, it is vital that you understand exactly how
LinkLoss
works, and how it will react in your network configuration, before
attempting to install the enclosed module(s).
OFF ON
8
7
6
5
4
3
2
1
JP2
FX
Jumper
LinkLoss
JP3
TX
Jumper
LinkLoss
TX/FX
Linkloss
TX/FX
Linkloss
Enabled Disabled
(Default)
Enabled Disabled
(Default)
3
1
I N S T A L L A T I O N
T I P
When testing, Black Box recommends you test your module first in an
unmanaged
environment. To do
this, turn the SNMP management switch to OFF on an
Media Converter System II
chassis
, or
remove the
management module from other SNMP-manageable chassis. Follow the unmanaged configuration
instructions, then install the module, connect the cables and test the LEDs. When finished, reactivate
management and configure the unit via the software.
Installing modules without understanding the effects of
LinkLoss
can cause perfectly
functioning units to appear flawed or even dead.
These modules must be used in pairs, with one
TX/SSFX Module
on one end of the conversion and
another TX.SSFX module, or another single-strand fiber product from Black Box, at the other end.
N O T E
JP2
FX LinkLoss
1 - 2
2 -3
JP3
TX Linkloss
1 - 2
2 -3
J
UMPER
F
UNCTION
O
N
O
FF
S
WITCH
F
UNCTION
D
EFAULT
1 Auto-Negotiation
OFF
2 - 8
Factory Configured -- DO NOT CHANGE
VARIES
F X
A N D
T X L
I N K
L
O S S
C
O M P A R E D
Feature
FX LinkLoss
TX LinkLoss
Fault Location
Fiber
Twisted Pair
Disabled LEDs
Twisted Pair
Fiber
LMC5112C — LMC5113C — LMC5114C LMC5115C — LMC5116C — LMC5117C
