Black Box LCL112A-TR User Manual

CampusLIGHT

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Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX
FREE technical support, 24 hours, 7 days a week: Call 724-746-5500 or fax [phone]
Mail order: Black Box Corpo ration, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.Black Box.com · E- m a i l: info@Black Box.com

CUSTOMER

SUPPORT

INFORMATION

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FEDERAL COMMUNICATIONS COMMISSION

AND

CANA DIAN DEPARTMENT OF COMMUNICATIONS

RADIO FREQUENCY INTERFERENCE STATEMENTS

This equipment generates, uses, and can radiate radio frequency energy and if not
installed and used properly, that is, in strict accordance with the manufacturer’s
instructions, may cause interference to radio communication. It has been tested and
found to comply with the limits for a Class A computing device in accordance with the
specifications in Subpart J of Part 15 of FCC rules, which are designed to provide
reasonable protection against such interference when the equipment is operated in a
commercial environment. Operation of this equipment in a residential area is likely to
cause interference, in which case the user at his own expense will be required to take
whatever measures may be necessary to correct the interference.

Changes or modifications not expressly approved by the party responsible for
compliance could void the user’s authority to operate the equipment.

This digital apparatus does not exceed the Class A limits for radio noise emission from
digital apparatus set out in the Radio Interference Regulation of the Canadian
Department of Communications.

Le présent appareil n umérique n’éme t pas de bruits rad ioélectriques dépassant les
limites applicables aux appareils numériques de la classe A prescrites dans le
Règlement sur le brouillage radioélectrique publié par le ministère des
Communications du Canada.

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NORMAS OFICIALES MEXICANAS (NOM)

EL ECTRICA L S A F ETY STATEMENT

INSTRUCCIONES DE SEGURIDAD

1. Todas las instrucciones de seguridad y operación deberán ser leídas antes de
que el aparato eléctrico sea operado.

2. Las instrucciones de seguridad y operación deberán ser guardadas para
referencia futura.

3. Todas las advertencias en el aparato eléctrico y en sus instrucciones de
operación deben ser respetadas.

4. Todas las instrucciones de operación y uso deben ser seguidas.

5. El aparato eléctrico no deberá ser usado cerca del agua—por ejemplo, cerca
de la tina de baño, lavabo, sótano mojado o cerca de una alberca, etc.

6. El aparato eléctrico debe ser usado únicamente con carritos o pedestales que
sean recomendados por el fabricante.

7. El aparato eléctrico debe ser montado a la pared o al techo sólo como sea
recomendado por el fabricante.

8. Servicio—El usuario no debe intentar dar servicio al equipo eléctrico más allá a
lo descrito en las instrucciones de operación. Todo otro servicio deberá ser
referido a personal de servicio calificado.

9. El aparato eléctrico debe ser situado de tal manera que su posición no interfiera
su uso. La colocación del aparato eléctrico sobre una cama, sofá, alfombra o
superficie similar puede bloquea la ventilación, no se debe colocar en libreros o
gabinetes que impidan el flujo de aire por los orificios de ventilación.

10. El equipo eléctrico deber ser situado fuera del alcance de fuentes de calor
como radiadores, registros de calor, estufas u otros aparatos ( incluyendo
amplificadores) que producen calor.

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11. El aparato eléctrico deberá ser connectado a una fuente de poder sólo del tipo
descrito en el instructivo de operación, o como se indique en el aparato.

12. Precaución debe ser tomada de tal manera que la tierra fisica y la polarización
del equipo no sea eliminada.

13. Los cables de la fuente de poder deben ser guiados de tal manera que no sean
pisados ni pellizcados por objetos colocados sobre o contra ellos, poniendo
particular atención a los contactos y receptáculos donde salen del aparato.

14. El equipo eléctrico debe ser limpiado únicamente de acuerdo a las
recomendaciones del fabricante.

15. En caso de existir, una antena externa deberá ser localizada lejos de las lineas
de energia.

16. El cable de corriente deberá ser desconectado del cuando el equipo no sea
usado por un largo periodo de tiempo.

17. Cuidado debe ser tomado de tal manera que objectos liquidos no sean
derramados sobre la cubierta u orificios de ventilación.

18. Servicio por personal calificado deberá ser provisto cuando:
A: El cable de poder o el contacto ha sido dañado; u
B: Objectos han caído o líquido ha sido derramado dentro del aparato; o
C: El aparato ha sido expuesto a la lluvia; o
D: El aparato parece no operar normalmente o muestra un cambio en su

desempeño; o

E: El aparato ha sido tirado o su cubierta ha sido dañada.

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CERTIFICATION NOTICE FOR

EQUIPMENT USED IN CANADA

The Canadian Department of Communications label identifies certified equipment.
This certification means that the equipment meets certain telecommunications­network protective, operation, and safety requirements. The Department does not
guarantee the equipment will operate to the user’s satisfaction.

Before installing this equipment, users should ensure that it is permissible to be
connected to the facilities of the local telecommunications company. The equipment
must also be installed using an acceptable method of connection. In some cases, the
company’s inside wiring associated with a single-line individual service may be
extended by means of a certified connector assembly (extension cord). The customer
should be aware that compliance with the above conditions may not prevent
degradation of service in some situations.

Repairs to certified equipment should be made by an authorized Canadian
maintenance facility—in this case, your supplier. Any repairs or alterations made by
the user to this equipment, or equipment malfunctions, may give the
telecommunications company cause to request the user to disconnect the
equipment.

Users should ensure for their own protection that the electrical ground connections of
the power utility, telephone lines, and internal metallic water pipe system, if present,
are connected together. This precaution may be particularly important in rural areas.

CAUTION:

Users should not attempt to make such connections themselves,
but should contact the appropriate electric inspection authority, or
electrician, as appropriate.

The LOAD NUMBER (LN) assigned to each terminal device denotes the percentage
of the total load to be connected to a telephone loop which is used by the device, to
prevent overloading. The termination on a loop may consist of any combination of
devices, subject only to the requirement that the total of the load numbers of all the
devices does not exceed 100.

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Ch apter Page

1. Specifications................................ ................................ ............................. 8

2. Introduction ................................ ................................ ................................ 9

2.1 Product Overview................................ ................................ ................ 9

2.2 Features................................ ................................ .............................. 9

2.2.1 Drive Distances ................................ ................................ ............. 9

2.2.2 Universal Copper Port................................ ................................ .... 9

2.2.3 Station Count................................ ................................ ............... 10

2.2.4 Ergonomics................................ ................................ ................. 10

2.2.5 Power Supply................................ ................................ .............. 10

. Overview Of Operating Modes................................ ................................ ...11

3.1 Variants of Token Ring ................................ ................................ ........11

3.1.1 Phantom Current Mechanisms................................ ..................... 11

3.1.2 Frequency Lockout................................ ................................ ...... 12

3.1.3 LCL112A-TR Trunk Operation................................ ...................... 12

3.1.4 LCL112A-TR Lobe Operation................................ ....................... 13

3.1.5 Pair Swapping during Auto-negotiation................................ ..........13

3.1.6 Main Ring (RI/RO) Operation................................ ........................ 14

4. Typical Applications................................ ................................ ................... 15

4.1 Fiber Lobe Link Station to Concentrator ................................ ............... 15

4.2 Fiber Trunk Link Between Stations................................ ...................... 15

4.3 Fiber Trunk Link Between Concentrators................................ ............. 16

4.4 Ring In to Ring Out................................ ................................ .............. 16

4.5 Single-mode LCL112A-TR to LCL161A/LCL162A................................ 17

5. Switch Settings ................................ ................................ ......................... 18

6. Installation................................ ................................ ................................ 20

7. Troubleshooting................................ ................................ ........................ 21

8. Diagnostic LEDs................................ ................................ ........................ 24

9. Accessories................................ ................................ .............................. 25

10. Glossary................................ ................................ ................................... 26

11. APPENDIX A: Switch Convention................................ .............................. 27

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12. APPENDIX B: Use with ATM25.6 Links................................ ....................... 28

13. APPENDIX C: Pinouts................................ ................................ ............... 29

Figures

Figure 1: LCL112A Front and Rear Panels.......................................................... 10

Figure 2: Station to Concentrator Link ................................ ................................ .15

Figure 3: Station to Station/Switch to Switch ................................ ....................... 16

Figure 4: Concentrator Port to Concentrator Port................................ ................ 16

Figure 5: Ring In to Ring Out between Passive MAUs................................ ........... 17

Figure 6: Single-mode LCL112A-TR to LCL161A/LCL162A SNMP Fiber LAN

Extender ................................ ................................ ........................... 17

Figure 7: Rackmount Metalwork................................ ................................ ........25

Figure 8: Switch Convention................................ ................................ .............. 27

Figure 9: Use with ATM25.6 Links................................ ...................................... 28

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1.' Specifications

Environment Token Ring 802.5. Supports classic Token Ring NICs, MAUs,

bridges, switches and hubs, and Dedicated Token Ring switch

ports and NICs
Data Rate 4 and 16Mbps
Fault Recovery

Time

5ms (milliseconds)

Bit Error Rate 1 in 109 maximum
Drive Distance Fiber

40km (24.9 miles) on 9/125µm single­mode

Copper 100m (CAT 5) total per link
Single-mode

Optics

Transmit Power

Receive Sensitivity

Power Budget

-13dBm (typical)

-32dBm (minimum)

19dB (typical)
Switches 4 operating mode switches. (Only Switches 1, 2 and 3 are used)
Environmental Operating

Temperature
Storage
Humidity

0°C to 40°C

-10°C to 70°C

Maximum 95% non-condensing

Power Supply 12V DC, external 110V or 220V AC adapter with plug in jack
Dimensions Single Unit

Power Supply

100mm x 140mm x 25mm (W x L x H)

100mm x 75mm x 60mm (W x L x H)
Gross Shipping

Weight

1.5 kg

Compliance EMC CE Directive 89/336/EEC

FCC Part 15 Subpart J
Safety CE Directive 73/23/EEC (LCL112A-TR

operates in selv only), UL 1950, cUL 1950

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2.'Introduction

2.1'Product Overview

The CampusLIGHT Token Ring Fiber Extender (LCL112A-TR) allows you to
interconnect Token Ring stations, hubs and switches. On single-mode fiber, links of
up to 40km (25 miles) are possible.
The LCL112A-TR copper port operates with most standard Token Ring products and
protocols including:

•!

Classic Token Ring stations

•!

Classic Token Ring concentrators

•!

Dedicated Token Ring concentrator ports

•!

Dedicated Token Ring node ports

•!

Redundant links from classic stations to Ring In/Ring Out ports

•!

Links between lobe ports of hubs

Examples of common applications are shown in Section 4. The LCL112A-TR Fiber
Extender also inter-operates with the LCL161A/LCL162A Token Ring repeaters to
provide cost-effective SNMP manageable links.

2.2' Feature

2.2.1'Drive Distances

2.2.1.1!Single-mode
A fiber optic link of up to 40km is permitted between extenders. This figure assumes

that the maximum link budget is not exceeded. The link budget is a maximum of 19dB.
The total copper link lengths can be up to 100m on CAT5 UTP.

See Technical Specifications for details.

2.2.2'Universal Copper Port

The copper interface automatically supports both 100Ω UTP and 150Ω STP cable
types. The LCL112A-TR Fiber Extender is always supplied with a shielded RJ45
connector.

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2.2.3'Station Count

The LCL112A-TR Fiber Extender does not affect station count. On STP networks up
to 250 stations may be present on a single ring, and on UTP networks up to 72*
stations may be present.

*NOTE: If jitter beating products are used this may be up to 250 stations.

2.2.4'Ergonomics

The LCL112A-TR Fiber Extender is packaged in a small free-standing case (140mm
x 100mm x 25mm, L x W x H). This can be rackmounted i n a 19" rack using the fiber
mounting metalwork. There are two variants: the LCL100-RACK supporting up to 4
LCL112A-TR units in a 1U high 19" frame, and the RM510 supporting up to 16
LCL112A-TR units in a 3U high 19" frame. For wallmounting a bracket that holds the
LCL112A-TR and its power supply is available, order code LCL100-WALL.

2.2.5'Power Supply

The LCL112A-TR Fiber Extender can either be powered from a small external power
supply or from a 3U high rackmounting power supply capable of supplying 14 devices.
Two variants are available: 90-264V AC (PS500) and 48V DC (LCL100-PS48).

NOTE: Units ordered for use with the rackmounting power supply will not contain a
separate power supply; this must be ordered separately.

Figure 1: LCL112A-TR Front and Rear Panels

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3.'Overview Of Ope r at in g Mod e s

To successfully install the LCL112A-TR extenders an understanding of the basic
interoperability issues is important. This section describes those aspects of Token
Ring important to LCL112A-TR interoperability.

3.1'Variants of Token Ring

Token Ring products have come a long way since the early 4Mbps systems based on
IBM cabling of the mid-eighties. Today ther e is a mix of devices supporting 4 and
16Mbps data transfer on passive and active MAUs, bridges, switches and routers
with cable choices of STP, UTP and fiber optics.

Many manufacturers have added to the complexity by introducing proprietary smart
mechanisms that increase ring integrity at the expense of interoperability.

The major issues when using a fiber extender in a network are:

•!

Phantom current mechanisms

•!

Frequency lockout on active MAUs

•!

Switch to switch auto-negotiation

3.1.1'Phantom Current Mechanisms

Phantom Current mechanisms are defined by IEEE 802.5 for station to concentrator
links. Phantom Current is a DC (Direct Current) signal sent with the data down the lobe
cable to the MAU to open the port at the MAU. This was the principle that allowed early
MAUs to be unpowered devices as the controlling power came from the station. The
station measures the amount of current flowing to detect wire faults in both open and
short-circuit conditions.
All lobe links, including those between the station and concentrator ports of switches,
make use of phantom current in a standard way.
Whenever fiber is used in a link it is not possible to send the phantom current from one
end of the link directly to the far end device. The transceiver local to the station has to
mimic a MAU port and conversely the transceiver next to the MAU has to mimic a
station. Special 802.5J keying sequences are used as messages between the
transceivers on the fiber link to indicate when phantom should be generated.

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Whilst the mode of phantom current operation is explicitly defined for the lobe there is
no standard for phantom current use in trunk applications. However some form of
phantom mechanism has been widely adopted by many manufacturers who are keen
to increase main path integrity. As most of these have different mechanisms of
phantom generation/detect, interoperation between different vendors’ smart Ring In
and Ring Out ports is usually only possible with the smart mode (phantom current
mode) disabled.
The rule of thumb is “Lobe Connections are standard”: always use phantom current
(referred to as ACL on the LCL112A-TR). Trunk Connections do not use phantom
current in a standard way and do not use phantom current on the Ring In /Ring Out
path.

3.1.2'Frequency Lockout

Frequency lockout mechanisms are designed to stop devices at 4Mbps crashing
16Mbps rings and vice versa. The lobe port of the MAU detects whether the data
received on its port is running at the correct speed. If the data is not at the correct
speed, or is not present, then the port is disabled.
This is important when establishing a link using LCL112A-TRs between say 2 lobe
ports as no data can be present on the link until AFTER THE LINK IS ESTABLISHED.
This can result in a “Catch 22” when the link will not insert until data is present, but no
data is present until the link is inserted.
The user should be aware that this does not apply to standard lobe style links between
a station and a concentrator.

3.1.3'LCL112A-TR Trunk Operation

When the LCL112A-TR is set to trunk mode it creates a fiber backbone between the
two LCL112A-TRs that the other devices can connect to. When the backbone
between the LCL112A-TRs is first started it has no data present. This will stop the
LCL112A-TRs inserting into the lobe ports of active MAUs until an active station is
present on the ring.
Note: Whenever the LCL112A-TRs are set to trunk mode, links to active concentrator
ports will only insert if the far end device connects to a main ring or a station port and
that device is carrying valid data.
Trunk links between the active ports of two active MAUs may never insert as both
ports wait for the far end to send valid data. The application shown in Figure 4,
Concentrator Port to Concentrator Por t, should be limited to passive MAUs or other
MAUs without frequency lockout.

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Full Duplex Operation
As stated above in trunk mode the LCL112A-TRs form a fiber backbone between the
two ends. This backbone does not carry any data until a device has inserted into the
ring. When switch ports connect to this ring it appears as the lobe port of a passive
MAU. No communication is possible between switch ports at either end of the link until
after insertion has taken place. This stops the auto-negotiation used to trade-up to full
duplex used by most switches.
To avoid this problem always connect switch ports together in lobe mode which
carries the data before the link is inserted using phantom current.

3.1.4'LCL112A-TR Lobe Operation

Lobe applications are the most common application for the LCL112A-TR. Here
connection is always made from a station port to a lobe or concentrator port.

Examples of station ports are:

1) !Switch ports permanently configured as “NODE", “STATION” or “ADAPTER”.

2) !Standard Token Ring NICs

3) !Bridge or Router ports.
Examples of concentrator ports are:

1) !Switch ports configured as “Concentrator”, “Lobe” or “Port”.

2) !Standard Hub lobe ports
In lobe mode the communication path between the station and the concentrator

operates as if the station and concentrator were connected using a copper cable. This
allows the auto-negotiation (trade-up) mechanisms used by Token Ring switches
and frequency lockout mechanisms to operate correctly as the whole link can carry
data end to end before the device is inserted by phantom current into the ring.

3.1.5'Pair Swapping during Auto-negotiation

Some NICs and switch ports that have full duplex capability not only negotiate speed
and mode of operation but local pair configuration too.
One device opts to be the station, the other the concentrator. This can involve the
switch swapping the transmit and receive pairs round after negotiation. As the
LCL112A-TR does not take part in the negotiation process it cannot perform pair
swapping in this way.
Consequently the ports of a switch must be fixed. One as a station and the other as a
concentrator and the local LCL112A-TRs configured to suit that fixed configuration.

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3.1.6'Main Rin g (RI/RO) Ope rati

The IEEE standard for Token Ring does not define a phantom (intelligent) method of
operation for automatic loopback. As an intelligent mode is desirable in the main ring
between Ring In and Ring Out, many manufacturers developed their own proprietary
methods of operation.
The LCL112A-TR uses a system that is compatible with the standard lobe
mechanism defined in the standard; this is enabled/disabled using the ACL
(Automatic Copper Loopback) switch. With ACL set to ON the NODE/CONC switch
determines whether the LCL112A-TR mimics a concentrator or node. With the switch
set to NODE the LCL112A-TR is configured to connect to a node i.e. uses phantom
current like a MAU lobe port. With the switch set to CONC the LCL112A-TR is
configured to connect to a concentrator i.e. uses phantom current like a
PC/station/router device.
Providing the Ring In or Ring Out port that you are connecting to uses phantom current
in this way, i.e. a Ring In port mimics the station and the Ring Out mimics a MAU then
the LCL112A-TR smart (ACL) mode can be selected.
For maximum compatibility the LCL112A-TR should be set to have ACL off. In this
mode the LCL112A-TR operates in accordance with the IEEE specification and
interoperability is assured.

No te: This requires that the attached MAUs also have their smart RI/RO operation
disabled. This does not apply to 802.5c stations which do not use the phantom current
mechanisms. Examples of 802.5c devices are IBM 8230 CAUs, Madge 8260 CAUs,
RI/RO ports etc.

Summary

For Trunk Operation
For maximum compati bility se t ACL OFF, Trunk Mode and disable any proprietary
phantom band smart RI/RO operation on the MAUs.
If the MAUs use phantom current that is compatible with Black Box’s LT4000A
phantom mechanism:
For Ring In connections set

ACL ON
Trunk Mode
Node Mode

For Ring Out connections set

ACL ON
Trunk Mode
Concentrator Mode

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4.'T ypical A pplic ations

4.1' Fiber Lo be L in k Sta tio n to C on cen tr ator

A site has a remote station which is to be connected to a MAU via fiber. This is the main
application for LCL112A-TRs. In this mode auto-negotiation between switches and
frequency lockout mechanisms all work as intended.

Figure 2: Station to Concentrator Link

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The total copper link length can be up to 100m; the fiber link can be up to 40km on
single-mode. This configuration is also applicable to remote server to switch
architecture.

NOTE: In Dedicated Token Ring Switches automatic switch configuration must not
be used. The switch at one end must be defined as station and the other as
concentrator (as shown above).

4.2' Fiber Trunk Link Between Stations

For links between servers or switches, the LCL112A-TR can be used to provide a
point to point link as shown in Figure 3. In this mode the fiber link operates as a fiber
backbone with lobe ports attached at the LCL112A-TRs. Devices inserting into the
ring cannot see the far end device until after insertion has completed. In this mode
auto-negotiation will not operate as the two ends do not communicate until after
insertion. This application works well for fixed data rate station to station half duplex
links.

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Figu re 3: St ati on to Station / Switch to Switc

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4.3'Fiber Trunk Link Between Concentrator

For links between switch concentrator ports or to interconnect two Token Ring
networks via the TCU port, the LCL112A-TRs should be configured as shown in
Figure 4.
Note: In this mode the LCL112A-TRs attempt to insert into the copper port
immediately. If the copper port of the MAU needs to see valid data before insertion is
permitted this method of operation will not work if both ends connect to such MAUs.
This configuration is only recommended for links between passive MAUs.

Figure 4: Concentrator Port to Concentrator Port

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4.4'Ring In to Ring Out

For links in the main ring path the LCL112A-TRs can be used in trunk mode. For
maximum compatibility the ACL (phantom current) should be switched off on both
LCL112A-TRs and the attached ports of the MAU. Phantom current can only be used
in this mode for devices operating with phantom current in exactly the same manner.

TOKEN RING FIBER EXTENDERS

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Figure 5: Ring In to Ring Out between Passive MAUs

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4.5'Sin gl e-m od e LC L1 12A -T R to LC L16 1A /LCL162A

To provide cost-effective manageable links between a router and a remote Token
Ring site, the LCL112A-TR may be used in conjunction with the LCL161A/LCL162A
fiber interface to permit one SNMP entity on the link as shown below.

Figure 6: Single-mode LCL112A-TR to LCL161A/LCL162A SNMP

Fiber LAN Extender

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Links to devices other than a router are possible at the LCL112A-TR end. The only
constraint is that the (LOBE/TRUNK Switch 2) operating switch is always set to
TRUNK.
For details of the LCL161A/LCL162A connection possibilities please refer to the
LCL161A/LCL162A SNMP Fiber LAN Extender Installation Manual.

TOKEN RING FIBER EXTENDERS

18

5.'Switch Settings

The switches on the LCL112A-TR are located on the rear panel. These provide the
following functionality.

Switch
Nu mber

Name Function

1 NODE/

CONC

When ACL is set to ON the NODE/CONC switch defines
whether the LCL112A-TR sources phantom current (i.e.
looks like the NIC in a PC) or provides the valid phantom
load (i.e. looks like the lobe port of a MAU).
To connect to a node (PC or other station/router etc.) set
switch 1 to “NODE” i.e. UP.
To connect to a concentrator (lobe port of a MAU etc.) set
Switch 1 to “CONC” i.e. DOWN.

No te: This switch has no effect when ACL is disabled.

2LOBE/

TRUNK

When set to “LOBE” the LCL112A-TR uses 802.5J keying
sequences to establish the link. This means that the fiber
link will not insert until the PC on the lobe is inserted on to the
LAN.
When set to “TRUNK” the fiber link is established
immediately. No devices need to be inserted using
phantom before the fiber link comes up.
Lobe mode is selected when the links are established by
switches, stations and routers connected to the LCL112A­TR in a lobe extension mode to a concentrator port of a
switch or MAU. Lobe mode is the best mode of operation for
inter-switch links and links to the lobe ports of MAUs.
Trunk mode is selected when the fiber link must always be
inserted, e.g. in the Ring In/Ring Out path. Trunk mode has
some limited use in creating a Fiber backbone between two
sites with devices connecting as stations to that backbone.
Trunk mode connections to active MAU lobe ports are not
recommended.

TOKEN RING FIBER EXTENDERS

19

Switch
Nu mber

Name Function

3 ACL With ACL on, the Automatic Copper Loopback is

enabled. This is the phantom current based insertion
mechanism that operates in the standard way that a PC
adapter card inserts into a MAU. This is used in
conjunction with the NODE/CONC
(Node/Concentrator) switch to provide controlled
insertion at either end of the link.
NODE with ACL ON when connected to a NODE or
station.
CONC with ACL ON when connected to a MAU lobe
port.
When connecting to the trunk of a Token Ring it is usual
to have ACL set to OFF, unless the MAUs are smart
MAUs that have a phantom current mechanism that
operates in the same manner.

Summary

ACL= ON for all lobe connections and trunk connections
that support the same phantom mechanism.
ACL= OFF for trunk (RI/RO) connections and 802.5c
(8230/CAU RI/RO) connections.

No te: When ACL is OFF the NODE/CONC switch has
no effect.

TOKEN RING FIBER EXTENDERS

20

6.'Installation

Installation of LCL112A-TR units requires the following tools and accessories:

Tools

•!

1300nm loss set (source and power meter)

•!

Screwdriver

Accessories

•!

Rackmounting kit (optional)

•!

Rackmounting screws/cage nuts

STEP BY STEP GUIDE

1. Decide on the operating mode suitable for your application. See Sections 3

and 4. Set the switch settings on the LCL112A-TRs noting that they may be
different at either end of the link.

2. Using a fiber optic loss set, measure the loss of the fiber link. Check that it is

less than 19dB for single-mode LCL112A-TRs.

3. If the LCL112A-TR is to be rackmounted, fasten the support bracket (Order

Code LCL100-RACK, not supplied) into the rack. Otherwise place the
LCL112A-TR on a suitable desk or shelf ensuring adequate space is left
around the LCL112A-TR for convection cooling.

4. With appropriate patch cords connect Tx to Rx for each LCL112A-TR.

5. Connect the remote site in the same manner.

6. Connect the power connector and power up the LCL112A-TR.

NOTE: Following power on, the LEDs displayed on the LCL112A-TRs will vary with
application. See Section 7.

TOKEN RING FIBER EXTENDERS

21

7.'Troubleshooting

Power
LED

Copper
LED

Fiber
LED

Rx
Alarm

Mode Condition

Off D/C D/C D/C ANY The LCL112A-TR is not receiving

power. Check that external PSU is
powered up and correctly
connected to the LCL112A-TR. If
swapping the PSU does not
correct t he fa ul t check that loc a l
AC supply is working. If t
LCL112A-TR power LED is st
extinguished, return the
LCL112A-TR to your supplier.

On Off Off On ANY The LCL112A-TR cannot see unit

at the far end of the link. Either
remote LCL112A-TR is
unpowered (see above) or receiv
path is faulty. Check receiv
power at this LCL112A-TR is
greater than -32dBm. Note that
the Single-mode LCL112A-TR is
a 1300nm device and an
appropriate power meter must
used.

On Off Off Off LOBE

ACL
ON
NODE

The LCL112A-TR can see the far
end LCL112A-TR device. T
copper link to the station is not
inserted. Check that cables ar
correctly attached, and a straight
through cable is used.
NOTE: This condition will exist
each time the local station is
powered off.

TOKEN RING FIBER EXTENDERS

22

Power
LED

Copper
LED

Fiber
LED

Rx
Alarm

Mode Condition

On Off Off Off LOBE ACL

ON CONC

LCL112A-TR can see far
end device, however
LCL112A-TR is not inserted
on either interface. Check
that the remote end station is
powered up, its drivers have
loaded correctly
crossover cable is used.

On D/C Off Off TRUNK

MODE ACL
ON CONC
OR
STATION

Fiber link not operating
correctly.

1) Check Tx connection to
remote LCL112A-TR is
powered up.

2) Check switch settings for
required operating mode.

On Off On Off TRUNK

ACL ON
CONC
(connector
to MAU lobe
port)

Fiber link is inserted,
however fault exists on
local copper link to MAU.
Check cabling and MAU
operation, and that a
crossover cable has been
used between the
LCL112A-TR and the
MAU.

On Off On Off TRUNK

ACL ON
NODE
(connected
to a station)

Fiber link is inserted,
however copper link is not
inserted. There are two
possible causes:

1) The PC is powered off.

2) The link between the PC
and LCL112A-TR is faulty:
Check that a straight
through patch cable is
being used.

TOKEN RING FIBER EXTENDERS

23

Power
LED

Copper
LED

Fiber
LED

Rx
Alarm

Mode Condition

On On On Off TRUNK

ACL OFF
RI/RO
CONNECT­ION

The fiber is inserted, the
links appear on, but the ring
does not work properly.
Inspect the copper cabling
to the LCL112A-TRs.
A crossover cable must be
used to connect to the RO
port. A straight through
cable must be used to
connect to RI.

On On On Off ANY Both the fiber and copper

links are inserted. All
connections appear good
and link should carry data.

TOKEN RING FIBER EXTENDERS

24

8.'Diagnostic LEDs

LED Co lo r Meaning

Power Green Power is correctly supplied to the LCL112A-TR. If this LED

is extinguished, check that the power supply is connected
to the LCL112A-TR and that it is powered up.

Copper
Inserted

Green The LCL112A-TR copper port is inserted into the network.

There are three reasons:

1) ACL is disabled and the fiber link is inserted. If the fiber
link is not inserted, the LED will be extinguished.

2) ACL is enabled and the operating mode (Switch 1) is set
for a concentrator. A valid load is present at the far end of
the copper link.

3) ACL is enabled and the operating mode (Switch 1) is set
for a station. A valid phantom source is present at the far
end of the copper link.

Fiber
Inserted

Green The fiber link is inserted. If the Inserted LED is extinguished

check the transmit fiber link.

If, after going through the troubleshooting section, you fail to resolve your problem
and require more help, please contact Black Box Technical Support at 724-746-5500
with the following information:

1. Unit type.

2. Unit serial number.

3. Environment lay-out. Include hubs, bridges and routers (with model

numbers), estimated cable lengths (between equipment) and type of cable
used.

4. A description of the problem you are experiencing.

5. List of tests performed.

TOKEN RING FIBER EXTENDERS

25

9.'Accessories

Figure 7 Rackmount Metalwork

Ordering Information

Product Number Description
LCL112A-TR RJ45- Single-mode ST, w/PSU and Lead

LCL100-RACK Rackmount Frame, 1U/19”, holds 4 units
RM510 Rackmount Frame, 3U/19”, holds 16 units
PS500 Power Supply for RM510 Rackmount Frame, 110/220V
LCL100-PS48 Power Supply for RM510 Rackmount Frame, 48V

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TOKEN RING FIBER EXTENDERS

26

10.'Glossary

802.5J IEEE fiber optic station attach standard
ACL Automatic Copper Loopback (Phantom controlled

insertion mechanism)

Conc/Concentrator
Port

A port of a Multistation Access Unit for a switch that a

station/PC can connect to
LCL112A-TR Token Ring Single-mode Fiber Extender
MAU Multistation Access Unit
Node A station on the ring or a port of a switch in station

emulation mode
RI Ring In port of a MAU
RO Ring Out port of a MAU
TCU Trunk Coupling Unit - the port of a MAU or switch that a

station can connect to

TOKEN RING FIBER EXTENDERS

27

11.'APPENDIX A: Switch Co nvention

Figure 8: Switch Convention

Switch Settings

The use of UP and DOWN for switch positions refers to the orientation
of the whole LCL112A-TR and not the switch block contained within.

'UP' in the manual is the same as 'ON' as indicated on the switch block.

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TOKEN RING FIBER EXTENDERS

28

12.'APPENDIX B: Use with ATM25.6 Links

The LCL112A-TR can be used with ATM25.6 switches and devices as shown below.

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This requires special crossover cables which can be ordered separately.

TOKEN RING FIBER EXTENDERS

29

13.'APPENDIX C: Pinouts

The LCL112A-TR copper port is wired in the same way as a MAU lobe port.
This is:

Function Pin
Tx A (+) 4
Tx B (-) 5
Rx A (+) 3

Rx B (-) 6
To connect to a station a straight through cable is always used.
To connect to a MAU a crossover cable is required. This is supplied with the unit and

has the following pinout:

RJ45 RJ45

34

43

56

65

Pins 1, 2, 7 and 8 are not used.

© Copyright 2000. Black Box Corporation. All rights reserved.

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