2
L2 10/100 SNMP-Manageable
Switching Media Converter
Both TX and FX LinkLoss allow this information to be obtained, even when physical access to a remote device (and its link integrity LED) is not available.
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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 information 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 twisted pair
port, resulting in a loss of link on the device connected to the twisted pair port.
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TX LinkLoss is another troubleshooting feature. 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,
resulting in a loss of link on the device connected to the fiber port.
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FiberAlert minimizes the problems associated
with the loss of one strand of fiber. If a strand is
unavailable, the Black Box 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.
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In a typical main site to remote
site media conversion, Black Box
recommends you enable your
media converters’ troubleshooting features as follows:
•FX LinkLoss: Main Site •FiberAlert: Remote Site Only •TX LinkLoss: Remote Site
This will ensure that any faults, no matter where they occur, can be detected
by an administrator at the main site. If you are unsure of how best to implement
these features in your configuration, please contact Black Box technical support
at 724-746-5500.
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The twisted pair port of the L2 10/100 module includes AutoCross, a feature
which automatically selects between a crossover workstation or pass-through/
repeater hub connection depending on the connected device.
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The twisted pair port on L2 10/100 auto-negotiates for speed and duplex
mode. These modules also provide the option of manually setting the speed and
duplex mode if the connected devices do not have the ability to auto-negotiate,
FiberAlert / LinkLoss Compared
Feature
Fault Location
Disabled LEDs
FiberAlert
Fiber
Fiber
FX LinkLoss
Fiber
Twisted Pair
TX LinkLoss
Twisted Pair
Fiber
FiberAlert should only be enabled on one side of a media conversion. Enabling it on both sides
would keep both transmitters off indefinitely.
NOTE
AAbboouutt LL22 1100//110000
The
LL22 1100//110000
is an SNMP-manageable, IEEE 802.3 10/100 switching
media converter from Black Box which converts both speed and media.
L2 10/100 modules provide a single conversion between:
• 10Base-T twisted pair and 100Base-FX multi-mode fiber, or
• 10Base-T twisted pair and 100Base-FX single-mode fiber, or
• 100Base-TX twisted pair and 100Base-FX multi-mode fiber, or
• 100Base-TX twisted pair and 100Base-FX single-mode fiber.
L2 10/100 TX/FX modules (LMC5118C, LMC5119C, LMC5120C, LMC5121C) are
for regular duplex fiber while L2 10/100 TX/SSFX modules (
LMC5122C,
LMC5123C, LMC5124C, LMC5125C LMC5126C, LMC5127C
) are for single-strand
fiber. L2 10/100 TX/SSFX Modules allow two wavelengths to share one fiber
strand — Full-Duplex data travels on different wavelengths (1310 nm and 1550
nm) — doubling the capacity of installed fiber.
L2 10/100 modules feature one RJ-45 connector and one pair of ST or SC
fiber connectors (single-strand fiber versions have one SC fiber connector). L2
10/100 modules require one slot in an SNMP-manageable High Density Media
Converter System II chassis or any SNMP Manageable Media Converter chassis
from Black Box. Please refer to your chassis’ manual for more information.
CCoonnffiigguurraattiioonn IInnssttrruuccttiioonnss
End-users may configure L2 10/100 modules for various features. See the
DIP Switch Location and Configuration Settings chart on page 2 for information
on available features. The following sections include instructions for configuring both managed (via an SNMP-compatible management application like
iView) and unmanaged modules.
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To manage one or more SNMP Modules, an SNMP agent must be present in
the chassis: High Density 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), then configure it using the management software. Within iView for
SNMP-Manageable Media Converters, features and troubleshooting functions
are configured in the Module Detail section under the picture of the module.
See the iView online help file for more information.
Management software will override any hardware settings (e.g., jumper, switch, etc.), so you MUST configure a module that will be managed via the software. Until a module installed in a managed chassis is configured via the software, the module (and its LEDs) may not work properly.
NOTE
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Before installing, L2 10/100 modules may be configured for LinkLoss,
FiberAlert, Auto-Negotiation, duplex mode and speed. The following illustra-
tion and charts include the available Dip Switch locations and configuration settings for L2 10/100 modules.
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Flow Control is used to throttle the END device to avoid dropping packets during network congestion.
* Selective Advertising is NOT an option when Auto-Negotiation is disabled.
** Full-Duplex Flow Control will Advertise ONLY in Full-Duplex Mode
Full-Duplex Control functions ONLY if link partner (end devices) also has Flow Control
*** Half-Duplex Flow Control DOES NOT Advertise
X = Switch setting is ignored.
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L2 10/100 modules include the following troubleshooting features:
• FX LinkLoss (a.k.a. "Fiber LinkLoss" or just "LinkLoss")
• TX LinkLoss (a.k.a. “Twisted Pair LinkLoss” or “Reverse LinkLoss")
• FiberAlert*
* FiberAlert is not available/required on single-strand fiber versions of L2 10/100 modules.
FiberAlert and LinkLoss are advanced troubleshooting features that can help
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).
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During normal operation, link integrity pulses are transmitted by all pointto-point Ethernet devices. When an Black Box media converter receives valid
link pulses, it knows that the device to which it is connected is up and sending 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.
Auto-Negotiation & Selective Advertising Configuration Chart
Auto-
Negotiation
Selective
Advertising
FDX/HDX 10/100
FDX
Flow Control
HDX
Flow Control
Advertise Al l
ON OFF X X X N/A
Selective
Advertising
ON ON
FDX
HDX
10/100
10/100
** ON/OFFXN/A
*** ON/OFF
No
Advertising
* OFF X
FDX
HDX
10/100
10/100
N/A
N/A
N/A
*** ON/OFF
Dip Switch Settings
S1 Function Default
1 Auto-Negotiation ON
2 TX HDX(ON) or TX FDX(OFF) OFF
3 TX 100 or TX 10(OFF) OFF
4
TX LinkLoss
OFF
5
FX LinkLoss
OFF
6 FX HDX or FX HDX(OFF) OFF
7
FiberAlert
OFF
8
Selective Advertising
OFF
S2 Function Default
1 Full-Duplex – Flow Control OFF
2 Half-Duplex – Flow Control OFF
3-8 Factory Default Do Not Change
3
1
INSTALLATION TIP
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 an iMcV Series 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.
LMC5118C — LMC5119C — LMC5120C — LMC5121C
LMC5122C — LMC5123C — LMC5124C — LMC5125C
LMC5126C — LMC5127C
or when Auto-Negotiation is not preferred. The fiber port does not auto-negotiate; it is always 100 Mbps with Half- or Full-Duplex operation selectable
through the switch settings or iView.
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L2 10/100 ships from the factory with Auto-Negotiation enabled on the twist-
ed pair port. In this mode, the twisted pair port negotiates for speed and duplex
(i.e. the module autosenses 10 Mbps Full-Duplex, 10 Mbps Half-Duplex, 100
Mbps Full-Duplex or 100 Mbps Half-Duplex with Flow Control).
Configure Auto-Negotiation on an L2 10/100 by adjusting the DIP switch (for
unmanaged modules) or via the management software. Please see Dip Switch
Locations and Configuration Settings on page 2 of this manual.
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Selective Advertising, when used in combination with Auto-Negotiation, provides the added ability to selectively determine whether twisted pair Duplex
Modes and Speed are manually or automatically negotiated by the L2 10/100.
If Selective A dvertising and Auto-Negotiation are both enabled, then TX FDX
and TX 100 can be separately enabled (ON) and/or disabled (OFF.
(See the Auto-Negotiation &Selective Advertising Configuration Chart on page 2 for optional configurations using these features.)
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The twisted pair and fiber ports on L2 10/100 modules can each be manually configured for either Half- or Full-Duplex operation. Before manually setting the duplex mode, Auto-Negotiation must be disabled. (Set Dip Switch 1 on
S1 to the OFF position.)
• Configure the twisted pair port for Full-Duplex by setting Dip Switch 2 to the
OFF position (Default).
• Configure the twisted pair port for Half-Duplex by setting Dip Switch 2
to the
ON position.
• Configure the fiber port for Full-Duplex by setting Dip Switch 6
to the OFF
position (Default).
• Configure the fiber port for Half-Duplex by setting Dip Switch 6
to the ON
position.
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The twisted pair port on L2 10/100 can also be manually set for 10 Mbps or
100 Mbps operation. Before manually setting the speed, Auto-Negotiation
must be disabled. (Set Dip Switch 1 on S1 to the OFF position.)
• Configure the twisted pair port for 10 Mbps operation by setting Dip Switch 3
to the OFF position.
• Configure the twisted pair port for 100 Mbps operation by setting Dip Switch 3
to the ON position.
NOTE: The fiber port always operates at 100 Mbps.
IInnssttaalllliinngg LL22 1100//110000 MMoodduulleess
L2 10/100 modules may be installed in any Black Box SNMP Manageable
Media Converter chassis. Each module requires one slot in the chassis. To
install a module, remove the blank brackets covering the slots where the module is to be installed (if present) by removing the screws on the outside edges of
the bracket. Slide the module into the chassis, via the card guides, until the
module is seated securely in the connector. Secure the module to the chassis
4
5
by tightening the captive screw. Save any “blanks” removed during installation
for future use should your configuration requirements change.
Installation Troubleshooting
• During installation, first test your 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 features cannot be disabled, you must establish BOTH your copper 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 on your media
converter.
• Make sure that you are using the appropriate twisted pair cable.
• The fiber transmitters used on Black Box media conversion modules can overdrive the receivers and cause data loss if used in installations where cable power
losses are low. To verify this, measure the optical power at the receiver. The
measured power should be no greater than specified and no less than the
Average Receive Sensitivity. If measured power is greater than specified, install
an optical attenuator to bring power within specification. Contact Black Box for
more information.
LLEEDD OOppeerraattiioonn
TTwwiisstteedd PPaaiirr LLEEDDss
TTXX LLLL
Glows green when TX LinkLoss is enabled.
11 0000
Glows yellow when 100 Mbps is selected on port.
LLNNKK//AACCTT
• Glows green when a link is established on port.
• Blinks green when data activity occurs.
FFDDXX//CCOOLL
• Glows yellow when port is in Full-Duplex mode.
• Blinks yellow when port is operating in Half-Duplex
mode and collisions occur.
FFiibbeerr OOppttiicc LLEEDDss
FFAA**
Glows green when FiberAlert is enabled.
* FiberAlert is not available/required on single-strand fiber L2 10/100 modules.
FFXX LLLL
Glows green when FX LinkLoss is enabled.
LLNNKK//AACCTT
• Glows green when a link is established on port.
• Blinks green when data activity occurs.
FFDDXX//CCOOLL
• Glows yellow when port is in Full-Duplex mode.
• Blinks yellow when port is operating in Half-Duplex
mode and collisions occur.
Black Box Customer Service
Call: (724) 746-5500 Phone orders 24 hours a day, 7:00 AM Monday to
midnight Friday; 8:00 AM to 4:00 PM Saturday (EST)
Fax: (724) 746-0746 or in North America 1-800-321-0746
Mail order: Black Box Corporation,
1000 Park Drive, Lawrence, PA 15055-1018
Technical Support and fax orders 24 hours a day.
SSppeecciiffiiccaattiioonnss
Environmental
Operating Temperature: 32° - 104° F (0° - 40° C)
Storage Temperature: 0° - 160° F (-20° - 70° C)
Humidity: 5 - 95% (non-condensing)
Power Consumption (Typical)
Input Load: 5mA
WWaarrrraannttyy IInnffoorrmmaa ttiioonn
Please contact Black Box for complete warranty information.
FFiibbeerr OOppttiicc CClleeaanniinngg GGuuiiddeelliinneess
Fiber optic transmitters and receivers are extremely susceptible to contamination by particles of dirt or dust which can
obstruct the optic path and cause performance degradation. Good system performance requires clean optics and connector ferrules.
1) Use fiber patch cords (or connectors, if you terminate your own fiber) only from a reputable supplier; low-quality
components can cause many hard-to-diagnose problems in an installation.
2) Dust caps are are installed by the manufactgurer to ensure factory-clean optical devices. These protective caps
should not be removed until the moment of connecting the fiber cable to the device. Assure that the fiber is properly terminated, polished and free of any dust or dirt and that the location is as free from dust and dirt as possible.
3) Store spare caps in a dust-free environment such as a sealed plastic bag or box so that, when reinstalled, they do
not introduce any contamination to the optics.
4) Should it be necessary to disconnect the fiber device, reinstall protective dustcaps.
5) If you suspect that the optics have been contaminated, alternate between blasting with clean, dry, compressed air
and flushing with methanol to remove dirt particles.
EElleeccttrroossttaattiicc DDiisscchhaarrggee PPrreeccaauuttiioonnss
Electrostatic discharge (ESD) can cause damage to your add-in modules. Always observe the following precautions
when installing or handling an add-in module or any board assembly.
1) Do not remove unit from its protective packaging until you’re ready to install it.
2) Wear an ESD wrist grounding strap before handling any module or component. If you do not have a wrist strap,
maintain grounded contact with the system unit throughout any procedure requiring ESD protection.
3) Hold boards by the edges only; do not touch the electronic components or goldconnectors.
4) After removal, always place the boards on a grounded, static-free surface, ESD pad or in a proper ESD bag. Do not
slide the board over any surface.
6
WARNING! Integrated circuits and fiber optic components are extremely susceptible to electrostatic
discharge damage. Do not handle these components directly unless you are a qualified service
technician and use tools and techniques that conform to accepted industry practices.
1000 Park Drive • Lawrence, PA 15055-1018 USA
TEL: (724) 746-5500 • FAX: (724) 873-7049
info@blackbox.com • www.blackbox.com
© 2002 Black Box Corp. All rights reserved.
The information in this document is subject to change without notice. Black Box assumes no responsibility for any errors
that may appear in this document. Product names are trademarks of the manufacturer. Other brands or product names
may be trademarks and are the property of their respective companies.
Document Number 56-80911BB-00-A2 October 2002
L2 10/100 TX/SSFX Modules must be used in pairs, with one module on one end of the conversion
and complementary module at the other, or with another Single-strand product from Black Box.
NOTE
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