Black Box Palm-Sized Ethernet Switch Express 8-Port... User manual

Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500)
FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax [phone]
Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: [email protected]
CUSTOMER
SUPPORT
INFORMATION
JUNE 2000
IC219A
Express 8-Port Mux
POWER
Express 8 Port Mux
2X
6
GROUP D
2X
7
2X
0
GROUP A
2X
1
2X
4
GROUP C
2X
5
2X
2
GROUP B
2X
3
TX
LINK
STATUS
RX
• • • • • • • •

EXPRESS 8-PORT MUX
1
FEDERAL COMMUNICATIONS COMMISSION
AND
INDUSTRY CANADA
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 Industry Canada.
Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables aux appareils numériques
de la classe A prescrites dans le Règlement sur le brouillage radioélectrique publié par Industrie Canada.
INSTRUCCIONES DE SEGURIDAD (Normas Oficiales Mexicanas Electrical Safety Statement)
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.
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.

EXPRESS 8-PORT MUX
2
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.
Classification of LED Transmitter Device
The optical transmitter contains an LED system and is classified “CLASS 1 LED PRODUCT” per EN60825-1
(+A11), Safety of Laser Products. Contact Black Box Corporation for repair if your Express 8-Port Mux ever
requires maintenance.

EXPRESS 8-PORT MUX
3
TRADEMARKS USED IN THIS MANUAL
ST is a registered trademark of AT&T.
AS/400 and IBM are registered trademarks of International Business Machines Corporation.
Any other trademarks mentioned in this manual are acknowledged to be the property of the trademark owners.

EXPRESS 8-PORT MUX
4
Contents
Chapter Page
1. Specifications ............................................................................................................................................................5
2. Introduction..............................................................................................................................................................6
2.1 Description........................................................................................................................................................6
2.2 What the Package Should Include ..................................................................................................................6
2.3 Connectors and Indicators ..............................................................................................................................7
3. Configuration ...........................................................................................................................................................8
3.1 Active Pair Setup...............................................................................................................................................8
3.2 Configuration Switch Settings .........................................................................................................................9
3.3 Mode Description...........................................................................................................................................10
3.4 Collapsed Rings ..............................................................................................................................................11
3.5 Connections....................................................................................................................................................11
4. Installation ..............................................................................................................................................................14
4.1 Host-Side Multiplexor Installation ................................................................................................................14
4.2 Device-Side Multiplexor Installation.............................................................................................................15
5. Troubleshooting .....................................................................................................................................................16
5.1 Possible Problems ...........................................................................................................................................16
5.2 Calling Black Box ...........................................................................................................................................18
5.3 Shipping and Packaging ................................................................................................................................18

EXPRESS 8-PORT MUX
5
1. Specifications
Active Pair: Port configurable
Fiber Optic Budget: 12 dB, typical
Input Impedance: 100 ohms, nominal
Maximum Distance: Host to mux: 2000 ft. (609.6 m); Mux to device: 2200 ft. (670.5 m); Mux to mux: 6600 ft.
(2011.7 m)
Speed: 1 or 2 Mbps, depending on IBM®5250 protocol
Connectors: (8) RJ-45, (1) DB25 M, (1) pair of ST®
Indicators: LEDs: Power, Port Activity, Mode
Peak Power Wavelength: 820 nanometers
Operating Temperature: 32 to 104°F (0 to 40°C)
Storage Temperature: 32 to 185°F (0 to 85°C)
Humidity Tolerance: Up to 95%, noncondensing
Power: 100–240 VAC, +5 VDC, external
Size: 1.75"H (1U) x 19"W x 8.8"D (4.4 x 48.3 x 22.4 cm)
Weight: 5.6 lb. (2.5 kg)

EXPRESS 8-PORT MUX
6
2. Introduction
This users’ manual applies to the Express 8-Port Mux, which is used with the IBM 5250 protocol. The 5250
family of products consists of IBM System 34, 36, 38, and the AS/400®, along with many supporting devices
manufactured by IBM and other companies. The Express 8-Port Mux works with all supporting devices that are
designed within the 5250 specifications.
2.1 Description
The Express 8-Port Mux has the unique ability to allow multiple AS/400 controller polling groups to be
transmitted over a single fiber optic pair. This feature allows all new AS/400e controllers to provide their
maximum throughput potential, in either 1-Mbps Optimized or 2-Mbps Express mode, by transparently
multiplexing the “split-polling” feature without requiring performance-robbing PTFs (Programming
Temporary Fixes).
All new IBM controllers support the split-polling feature as a means of achieving higher throughput rates, even
when connected to standard legacy devices. The Express 8-Port Mux allows the split-polling feature to remain
enabled, with performance of up to 4 times greater than standard legacy 1-Mbps 5250 protocol.
The Express 8-Port Mux has 8 shielded RJ-45 port connections as well as a DB25 “direct connection,”
eliminating the need for the twinax “brick” and associated twinaxial cabling. The link between the two muxes
uses multimode fiber cable with ST connectors. It can operate in both point-to-point and multipoint ring
topologies, reducing hardware requirements by up to 50%. Other features include advanced noise filtering,
LED port diagnostics, configurable UTP pin assignments, and a field-replaceable wide-ranging power supply.
2.2 What the Package Should Include
Remove the packing material and check for the items below. If anything is missing or damaged, contact Black
Box at [phone].
• (1) Express 8-Port Mux (includes a 100-to-240-VAC input external power supply, attached on the rear panel)
• (1) AC power cord (North American units only)
• This users’ manual
CAUTION
Do not apply power to any damaged component!

EXPRESS 8-PORT MUX
7
2.3 Connectors and Indicators
The Mux’s LEDs and connectors are described below. Refer to Figures 2-1 and 2-2 to locate each connector or
indicator.
Figure 2-1. The Express 8-Port Mux’s Front Panel.
Figure 2-2. The Express 8-Port Mux’s Rear Panel.
Power LED On when the Express 8-Port Mux is powered up.
TX Activity LED On when a signal is transmitted to the fiber optic aggregate link.
RX Activity LED On when a signal is received from the fiber optic aggregate link and the
Mux synchronizes to it.
Polling Group Status LEDs The upper green LEDs are express mode indicators. These LEDs activate
when an express signal is detected, and they remain on until a 1-Mbps signal
is detected or a system reset occurs. The lower green LEDs are data activity
indicators. These LEDs activate when a signal is present.
Polling Group Connectors There are two polling groups. Each polling group has been divided into two
port groups. Polling group #1 consists of ports 0 through 3 (port groups A
and B), and polling group #2 consists of ports 4 through 7 (port groups C
and D). Ports within a polling group must be connected to ports from a common
controller.
IIIIIIIIIIIIIIIIIIIIIIIIIIIIII
IIIIIIIIIIIIIIIIIIIIIIIIIIIIII
POWER
Express 8 Port Mux
2X
6
GROUP D
2X
7
2X
0
GROUP A
2X
1
2X
4
GROUP C
2X
5
2X
2
GROUP B
2X
3
TX
LINK
STATUS
RX
• • • • • • • •
Power Activity LEDs
(TX and RX)
FCC label DB25
Configuration
switches
Fiber optic
link
DC power
connection
External power supply
Product
identification
label
Polling Group #1 Status
LEDs and Connectors Polling Group #2 Status
LEDs and Connectors

EXPRESS 8-PORT MUX
8
3. Configuration
READ THIS FIRST!
1. Do not look into any fiber optic connection or fiber optic cable.
2. Do not connect the Express 8-Port Mux to any type of public network.
3. Do not connect any outdoor cabling to the Express 8-Port Mux without proper
lightning protection.
4. Do not use unauthorized power supplies or cables.
5. Do not connect to non-5250-protocol devices.
6. Do not disassemble or modify the power supply and its cables.
7. Disconnect all cables prior to configuration.
8. Devices attached to the UTP network must comply with the voltage and current
limits for Class 2 Power-Limited Signal Circuits as defined by article 725 of the
National Electrical Code and Section 16 of the Canadian Electrical Code.
9. For your safety, power outlets must be properly wired and grounded.
10. Never attempt to service equipment connected to the data cable network or the
grounded receptacle during an electrical storm. Exposure to lethal voltages may
occur when lightning is present.
3.1 Active Pair Setup
Each Express 8-Port Mux is factory configured per customer request. The factory setting is circled on the
identification label located on the rear panel. (Refer to Figure 2-2 to locate the identification label.)
The active pair may be re-configured by performing the following procedure:
· Disconnect all power to the unit.
· Remove the two top-cover screws on the rear panel.
· Gently slide the top cover back one inch.
· Hold the top cover and tilt it up.
Reconfigure the jumpers located behind the RJ-45 connectors as required. Settings for active pair assignment
are shown below:
Figure 3-1. Active Pair Jumper Settings.

EXPRESS 8-PORT MUX
9
Note that connections to the DB25 and RJ-45 connectors are mutually exclusive. If any of the three pairs of the
RJ-45 connectors are selected, the DB25 is disconnected. If the DB25 is selected, the RJ-45 connectors are
disconnected. All jumper settings must be identical.
To reinstall the top cover, tilt the top cover down, and slide the top cover forward until it mates completely with
the bottom cover. Install the two top-cover screws.
3.2 Configuration Switch Settings
The configuration switch settings are shown below.

EXPRESS 8-PORT MUX
10
3.3 Mode Description
A point-to-point link is made up of two multiplexors connected by a single backbone (see the illustration
below).
When multiple multiplexors are connected in series with fiber optic transmit to fiber optic receive, they form a
ring topology (see the illustration below).
• • • • •
• • • • •
RX
TX
HOST PORT
CONNECTIONS DEVICE CONNECTIONS
MULTIPLEXOR MULTIPLEXOR
FIBER OPTIC BACKBONE
• • • • • • • • • •
DEVICE
CONNECTIONS
DEVICE
CONNECTIONS
TX
RX
RXTX
RX TX
HOST PORT
CONNECTIONS DEVICE CONNECTIONS
MULTIPLEXOR MULTIPLEXOR
FIBER OPTIC BACKBONE
TX
RX TX
RX
• • • • • • • • • •

EXPRESS 8-PORT MUX
11
3.4 Collapsed Rings
The ring mode shown in Section 3.3 is seldom implemented. Instead fiber optic cables usually star out from a
central location. Therefore, a ring is created by interconnecting the fiber optic star segments at the central
location. This technique is known as a collapsed ring.
3.5 Connections
Figure 3-2. Typical AS/400 Installation.
TX RX
TX RX
TX RX
MDF
TX RX
IDF (Intermediate
Distribution Frame)
(Main Distribution Frame) Fiber optic
patch panel
Fiber
optic
jumpers
Remote multiplexor #1
Remote multiplexor #2
Remote multiplexor #3
Wall plate
AS/400
62.5-micron multimode
Stars
Patch panel
Balun and T cable
Mini Twinax Balun
(IC067A)
UTP
cabling
Express 8-Port Mux Express 8-Port Mux
8-Port Twinax Brick
Mini Twinax Baluns (IC067A)
Host multiplexor #1
IDF (Intermediate
Distribution Frame)
IDF (Intermediate
Distribution Frame)

EXPRESS 8-PORT MUX
12
Figure 3-3. AS/400 Twinax Brick Detail.
Figure 3-4. Typical AS/400 Direct Connect Installation.
62.5-micron multimode
Express 8-Port Mux
Express 8-Port Mux
AS/400
DB25 to DB25
STP cable
UTP cabling
Star
Panel
Wall plate
Balun and T cable
Mini Twinax Balun (IC067A)
Polling group #1
Port and polling-group assignments on
the twinax brick for the new AS/400 WSC
with split polling feature (front view).
Mini Twinax
Balun (IC067A)
Mini Twinax
Balun (IC067A)
Mini Twinax
Balun (IC067A)
Mini Twinax
Balun (IC067A)
Mini Twinax
Balun (IC067A)
Mini Twinax
Balun (IC067A)
Mini Twinax
Balun (IC067A)
Mini Twinax
Balun (IC067A)
Polling group #2
Port #4
Port #5
Port #6
Port #7
Port #0
Port #1
Port #2
Port #3
To AS/400 WSC
To Express 8-Port Mux To Express 8-Port Mux
0
1
2
3
4
5
6
7

EXPRESS 8-PORT MUX
13
Figure 3-5. Typical Remote Controller Installation.
A major difference between the newer workstation controllers and the older ones is the number of polling
groups. The older WSCs had one polling group for all eight ports. The newer WSCs have two polling groups.
Divide the twinax brick in two. Ports 0 through 3 make up one polling group, and ports 4 through 7 make up
the other polling group. The twinax brick detail illustrates a proper connection.
Figure 3-6. Typical System 3X Installation.
62.5-micron multimode
Express 8-Port Mux
Stars
Patch panel
UTP cabling
Wall plate
Balun and T cable
Mini Twinax Balun (IC067A)
Express 8-Port Mux
Remote Controller
Two 4-Port Twinax
Bricks and Mini Twinax
Baluns (IC067A)
Up to 8 Twinax Ports
and Mini Twinax Baluns
(IC067A)
Mini Twinax Balun (IC067A)
System 3X
62.5-micron multimode
Express 8-Port Mux
UTP cabling
Star
Patch panel
Wall plate
Balun and T cable
Express 8-Port Mux

EXPRESS 8-PORT MUX
14
4. Installation
READ THIS FIRST!
1. Do not look into any fiber optic connection or fiber optic cable.
2. Do not connect the Express 8-Port Mux to any type of public network.
3. Do not connect any outdoor cabling to the Express 8-Port Mux without proper
lightning protection.
4. Do not use unauthorized power supplies or cables.
5. Do not connect to non-5250-protocol devices.
6. Do not disassemble or modify the power supply and its cables.
7. Disconnect all cables prior to configuration.
8. Devices attached to the UTP network must comply with the voltage and current
limits for Class 2 Power-Limited Signal Circuits as defined by article 725 of the
National Electrical Code and Section 16 of the Canadian Electrical Code.
9. For your safety, power outlets must be properly wired and grounded.
10. Never attempt to service equipment connected to the data cable network or the
grounded receptacle during an electrical storm. Exposure to lethal voltages may
occur when lightning is present.
4.1 Host-Side Multiplexor Installation
1. Set the configuration switches on the rear panel of the host-side Express 8-Port Mux as follows:
Switches 1 and 2 ON for a point-to-point application
or
Switch 1 ON and Switch 2 OFF for a ring application.
2. The Express 8-Port Mux is designed for a 19" rack. The unit should be properly installed using all four
mounting holes. Rack hardware is not provided. We recommend using plastic or nylon washers under
mounting screws to protect the chassis’s finish.
3. A polling group is a group of ports which have one port active at a time. The new AS/400 workstation
controllers (WSCs) have two polling groups. Ports 0 through 3 and ports 4 through 7 constitute the two
groups. The Express 8-Port Mux can accommodate two polling in the same fashion. Do not connect more
than one host polling group to an Express 8-Port Mux polling group. Connect the host ports to the Express 8-Port
Mux ports.
WARNING
Do not look into any fiber optic connector or fiber optic cable.
4. The Express 8-Port Mux has ST fiber optic connectors. Connect the multimode fiber optic cables to the
optical link connectors on the rear panel of the Express 8-Port Mux. Note the fiber color or number on
the “TX” and “RX” to ensure proper connection to the remote multiplexor. Strain relieve and label all
cables.

EXPRESS 8-PORT MUX
15
5. The external power supply is mounted on the Express 8-Port Mux’s rear panel. The AC power cord must
be firmly inserted into the external power supply and strain relieved.
6. Plug the other end of the AC power cord into a properly wired outlet. All data and mode LEDs on the
Express 8-Port Mux will activate for two seconds and fade off. The amber power LED on the front panel,
the green power LED on the top of the external power supply, and the TX LED will activate and remain
on. At this time the data activity LEDs will flash at the host’s polling rate. The RX LED will be off until the
remote Mux is installed.
4.2 Device-Side Multiplexor Installation
1. Set the configuration switches on the rear panel of the device-side Express 8-Port Mux as follows:
Switch 1 OFF and Switch 2 ON for a point-to-point application
or
Switches 1 and 2 OFF for a ring application.
2. The Express 8-Port Mux is designed for a 19" rack. The unit should be properly installed using all four
mounting holes. Rack hardware is not provided. We recommend using plastic or nylon washers under
mounting screws to protect the finish.
WARNING
Do not look into any fiber optic connector or fiber optic cable.
3. The Express 8-Port Mux has ST fiber optic connectors. For point-to-point applications, connect the
multimode fiber optic cable attached to the host side Multiplexor’s “TX” to the device side Multiplexor’s
“RX” optical link connector located on the rear panel of the Express 8-Port Mux, and connect the
multimode fiber optic cable attached to the host side Multiplexor’s “RX” to the device side Multiplexor’s
“TX” optical link connector located on the rear panel of the Express 8-Port Mux. For ring applications,
connect the fiber optic TX of a Multiplexor to the fiber optic RX of the next multiplexor downstream in
the ring until the ring is complete. Make sure that the cables are properly strain relieved and labeled.
4. Connect the Express 8-Port Mux ports to the host ports of the active- or passive-star hub and follow the
installation procedure for the hub.
5. The external power supply is mounted on the rear panel of the Express 8-Port Mux. The AC power cord
must be firmly inserted into the external power supply and strain relieved.
6. Plug the other end of the AC power cord into a properly wired outlet. All data and mode LEDs on the
Express 8-Port Mux will activate for two seconds and fade off. The amber power LED on the front panel,
the green power LED on the top of the external power supply, and the “TX and RX” LEDs will activate
and remain on. If any terminals are on, the data activity LEDs will activate. If express devices and an
express host are attached, the port status LEDs (upper green LEDs) will activate. Devices in a ring
application will not show a sign-on screen until the ring is complete.

EXPRESS 8-PORT MUX
16
5. Troubleshooting
5.1 Possible Problems
If you experience problems with your Express 8-Port Mux, follow the guidelines below.
1) Collect all information relevant to this application.
· Express 8-Port Mux serial numbers.
· Host type and operating system software level.
· Quantity, and type of peripheral devices.
· Interconnecting cable types and distances.
· Equipment environment.
· Interconnection diagrams.
2) Set up the application with all Multiplexors in one room interconnected with fiber optic jumpers. Verify the
application with a host port and a terminal.
3) Search through the common problems and possible causes provided in this chapter.
The Express 8-Port Mux front-panel power LED is off.
· Verify that the AC and DC connections are proper.
· Verify that the AC outlet is functioning correctly.
If the problem persists, observe the status of the external power supply’s LED and contact Technical Support.
The Express 8-Port Mux RX LED is off or flashing.
· Verify that the fiber optic connectors are properly connected.
· Verify that the fiber optic budget and distance has not been exceeded.
The Express 8-Port Mux TX LED is off.
· Contact Technical Support.

EXPRESS 8-PORT MUX
17
A device is down or unstable.
· Verify that there is one host polling group per Express 8-Port Mux polling group.
· Verify that the host’s device type matches the device.
· Verify that the host workstation controller’s capacity has not been exceeded.
· Verify that the device is properly terminated. A peripheral is terminated when its twinaxial port has two
54.9-ohm resistors located between the “A” phase pin & earth ground and the “B” phase pin & earth
ground. Termination is provided by a “Y” or “T” cable assembly or by a terminating balun (that is, ASFT
series).
· Verify that there are no polarity reversals in the cable.
· Verify that the cable distance does not exceed the Express 8-Port Mux specification.
· Verify that the cable is data grade.
· Verify that the wiring uses natural pairs.
· Verify that the wiring avoids sources of environmental noise.
· Verify that the balun’s pinout matches the Express 8-Port Mux’s pinout.
· Verify that the host side balun’s pinout/polarity match the device side balun’s pinout/polarity.
Devices interfere with each other.
· Verify that there is one host-polling group per Express 8-Port Mux polling group.
· Verify that devices on star segments have unique addresses.
· Verify that all devices are properly terminated.
Devices cannot operate in Express mode.
· Verify that the host and the device are capable of Express mode.
· Verify that all interconnecting components support the Express mode.
· Verify that all devices on the port are Express ready.
· Verify that all cable distances are within the Express specification.
· The controller may have downshifted to 1 Mbps because of errors during installation. The controller will
retry the Express mode in approximately one hour.
Flashing Express LEDs.
· Determine the number of Express devices on the port. If there are less than seven devices, the flashing
Express LED is normal.
Express LED on without data activity.
· If the host is disconnected during an express connection, the express LED remains on.

EXPRESS 8-PORT MUX
18
5.2 Calling Black Box
If you determine that your Express 8-Port Mux is malfunctioning, do not attempt to alter or repair the unit. It
contains no user-serviceable parts. Contact Black Box at 724-746-5500.
Before you do, make a record of the history of the problem. We will be able to provide more efficient and
accurate assistance if you have a complete description, including:
• the nature and duration of the problem.
• when the problem occurs.
• the components involved in the problem.
• any particular application that, when used, appears to create the problem or make it worse.
5.3 Shipping and Packaging
If you need to transport or ship your Express 8-Port Mux:
• Package it carefully. We recommend that you use the original container.
• If you are shipping the Express 8-Port Mux for repair, make sure you include everything that came in the
original package. Before you ship, contact Black Box to get a Return Materials Authorization (RMA)
number.

1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax [phone]
© Copyright 2000. Black Box Corporation. All rights reserved.