Black Box ACU4001A, ACU4201A, ACU4222A User Manual

November 2009

USB Micro Extender

ACU4001A
ACU4201A
ACU4222A

THE SERVSWITCH™ FAMILY

Welcome to the ServSwitch™ Family!

Thank you for purchasing a BLACK BOX® ServSwitch™ Brand USB Micro Extender
model! We appreciate your business, and we think you’ll appreciate the many ways that your
enhanced extension system will save you money, time, and effort.

That’s because our ServSwitch family is all about breaking away from the traditional,
expensive model of computer management. You know, the one-size-fits-all-even-if-it-doesn’t
model that says, “One computer gets one user station, no more, no less.” Why not a single
user station (monitor, keyboard, and mouse) for multiple computers—even computers of
different platforms? Why not a pair of user stations, each of which can control multiple
computers? Why not multiple user stations for the same computer?

With our ServSwitch products, there’s no reason why not. We carry a broad line of robust
solutions for all these applications. Do you have just two PCs, and need an economical
alternative to keeping two monitors, keyboards, and mice on your desk? Or do you need to
share dozens of computers, including a mix of IBM® PC, RS/6000®, Apple® Macintosh®,
Sun Microsystems®, and SGI™ compatibles among multiple users with different access
levels? Does your switch have to sit solidly on a worktable and use regular everyday cables?
Or does it have to be mounted in an equipment rack and use convenient many-to-one cables?
No matter how large or small your setup is, no matter how simple or how complex, we’re
confident we have a ServSwitch system that’s just right for you.

The ServSwitch™ family from Black Box—the one-stop answer for all your KVM-switching
needs!

This manual will tell you all about your new ServSwitch™ Brand USB Micro Extender,
including how to install, operate, and troubleshoot it. For an introduction to the Extender, see
Chapter 2. The Extender product codes covered in this manual are:

ACU4001A
ACU4022A
ACU4201A
ACU4222A

User Guide Revision: 2.0 (November 2009)

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SERVSWITCH™ BRAND USB MICRO EXTENDER FAMILY

Copyrights and Trademarks

©2005/2009. All rights reserved. This information may not be reproduced in any manner
without the prior written consent of the manufacturer.

Information in this document is subject to change without notice and the manufacturer shall
not be liable for any direct, indirect, special, incidental or consequential damages in
connection with the use of this material.

All trademark and trade names mentioned in this document are acknowledged to be the
property of their respective owners.

Disclaimer

While every precaution has been taken in the preparation of this manual, the manufacturer
assumes no responsibility for errors or omissions. Neither does the manufacturer assume any
liability for damages resulting from the use of the information contained herein. The
manufacturer reserves the right to change the specifications, functions, or circuitry of the
product without notice.

The manufacturer cannot accept liability for damage due to misuse of the product or due to
any other circumstances outside the manufacturer’s control (whether environmental or
installation related). The manufacturer shall not be responsible for any loss, damage, or injury
arising directly, indirectly, or consequently from the use of this product.

Cautions and Notes

The following symbols are used in this guide:

CAUTION. This indicates an important operating instruction
that should be followed to avoid any potential damage to
hardware or property, loss of data, or personal injury.

NOTE. This indicates important information to help you make the best use
of this product.

2

FCC/CDC STATEMENTS

FEDERAL COMMUNICATIONS COMMISSION

AND CANADIAN 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 B 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.

Shielded cables must be used with this equipment to maintain compliance with radio
frequency energy emission regulations and ensure a suitably high level of immunity to
electromagnetic disturbances.

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 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 le Ministère des Communications du Canada.

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SERVSWITCH™ BRAND USB MICRO EXTENDER FAMILY

EUROPEAN UNION DECLARATION OF CONFORMITY

WARNING!

This is a Class A product. In a domestic environment, this product may cause
radio interference, in which case the user might be required to take adequate
remedial measures.

This product complies with the following harmonized standards for Information Technology
Equipment: EN55022:2006 (Class A), EN55024:1998 + A1:2001 + A2:2003.

To maintain compliance the use of correctly installed shielded (STP/FTP) interconnection
cable is advised. Only use CPU cables and power supplies provided (or recommended) for
use with this product.

When used in environments that have high levels of electromagnetic interference or excessive
power ground noise, you may experience disturbances to video and/or data transmission. If
this is the case, please refer to the Troubleshooting section of the User Guide for further
information, or contact Technical Support. In electrically noisy environments, the use of
shielded (STP/FTP) rather than unshielded (UTP) interconnection cable is recommended.

4

NOM STATEMENT

NORMAS OFICIALES MEXICANAS (NOM)

ELECTRICAL SAFETY 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 pedestals 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.

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SERVSWITCH™ BRAND USB MICRO EXTENDER FAMILY

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.

6

SAFETY PRECAUTIONS AND INSTALLATION GUIDELINES

Safety Precautions and Installation Guidelines

To ensure reliable and safe long-term operation please note the following installation
guidelines:

• Do not use to link between buildings.

• Only use in dry, indoor environments.

• If the building has 3-phase AC power, try to ensure that equipment connected to the

Local and Remote Units is on the same phase.

• Try not to route the CATx link cable alongside power cables.

• The use of shielded CATx cable is recommended to maintain compliance.

• Ensure that the system connected to the Local Unit is connected to power ground.

• Ensure that the monitor connected to the Remote Unit is connected to power ground.

• The Remote Unit and any power supplies can get warm. Do not situate them in an

enclosed space without any airflow.

• Do not place the power supply directly on top of the Remote Unit.

• This product is not suitable for use in isolated medical environments.

To safeguard against personal injury and avoid possible
damage to equipment or property, please observe the
following:

• Only use power supplies originally supplied with the

product or manufacturer-approved replacements. Do not
attempt to dismantle or repair any power supply. Do not
use a power supply if it appears to be defective or has a
damaged case.

• Connect all power supplies to grounded outlets. In each

case, ensure that the ground connection is maintained
from the outlet socket through to the power supply’s AC
power input.

• Do not attempt to modify or repair this product, or make

a connection from the CATx link interface (RJ45) to any
other products, especially telecommunications or
network equipment.

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SERVSWITCH™ BRAND USB MICRO EXTENDER FAMILY

Contents

1. Quick Setup 9

2. Overview 10

2.1 Introduction 10

2.2 Glossary 10

2.3 Features 12

2.4 Product Range 13

2.5 Compatibility 14

2.6 How to Use This Guide 15

3. Installation 16

3.1 Package Contents 16

3.2 Interconnection Cable Requirements 17

3.3 Remote Unit Installation 18

3.4 Local Unit Installation 21

4. Troubleshooting 24

4.1 Video 24

4.2 USB 25

4.3 Audio 26

4.4 Serial 26

4.5 General Questions 27

Appendix A: Example Applications 28
Appendix B: Rack Mount Options 32
Appendix C: Audio/Serial Ports 33
Appendix D: Calling Black Box 35
Appendix E: Specifications 36

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QUICK SETUP

1. Quick Setup

This section briefly describes how to install your USB Micro extender system. Unless you are
an experienced user, we recommend that you follow the full procedures described in the rest
of this manual.

Set Video Distance DIP Switches

Set DIP switches on base of Remote Unit to position for
Interconnect cable length:

DIP Switch 1: Primary Interconnect (channel 1)
DIP Switch 2: Interconnect 2 (ACU4201A & ACU4222A only)

15-75ft (5-25m) OFF (default)
75ft-150ft (25-50m) ON

Connect Remote Unit and devices

Connect Remote Unit to monitor, USB and audio/serial
devices (if present). Connect 5V power supply.

Connect Local Unit to CPU

Connect Local Unit to CPU video, USB and Audio/Serial
ports (if used).
Connect Local monitor(s) to video output(s) on Local Unit.
Note. If you intend to connect the Local Unit to an external
USB hub, ensure that it is self-powered. If not, you will need
an additional 5V PSU for the Local Unit (not supplied).

Connect Local and Remote Units

Connect extender units with up to 150ft (50m) of compatible
CATx interconnect cable.

Power Up

Power up the CPU.
Switch on the Remote Unit power supply.
Auto-adjust flat panel monitors

See Setting the

Cable Length DIP
Switches on page

18.

See Connecting
the Remote Unit on
page 19.

See Local Unit
Installation on page

21.

See Interconnection
Cable Requirements
on page 17.

Use LEDs on
Interconnect ports to
check operation (see
pages 20 and 23).

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SERVSWITCH™ BRAND USB MICRO EXTENDER FAMILY

2. Overview

2.1 Introduction

The ServSwitch™ Brand USB Micro Extender Series enables high-resolution video, USB,
stereo audio, and serial port signals to be communicated up to 150ft (50m) over Category 5,
5e, 6 or higher (CATx) cable.

A basic USB extension system comprises a Local Unit (transmitter) and a Remote Unit
(receiver). The Local Unit connects directly to the computer (or a USB Hub) using the
supplied cable(s). The user console (consisting of monitor, keyboard, mouse and other
devices) attaches to the Remote Unit. All Local Units in the USB Micro Extender Series have
video output ports, allowing a second user console at the CPU (using further CPU/Hub ports).
The Remote and Local Units communicate video and data information along the connecting
CATx cable (see Figure 1).

Within the product range, models are available with:

• Audio and serial transmission: bi-directional stereo audio (16-bit digitized) and

transparent serial COM port (to 19.2Kbps).

• Multiple video channels: single and dual heads.

2.2 Glossary

The following terms are used in this guide:

CATx
PSU
KVM
Console

Dual Access
Single Head
Dual Head

10

Any Category 5, 5e, 6 or higher cable.
Desktop power supply.
Keyboard, Video and Mouse.
A keyboard, monitor, and mouse, plus optional USB/serial/audio

devices.
A system allowing connection of local and remote user consoles.
An extender system that supports one monitor.
An extender system that supports two monitors.

OVERVIEW

CPU

Local Unit

USB and Video extension over
CATx cables up to 150ft (50m).

Remote Unit

Serial and Audio
Transmission

ACU4022A & ACU4222A only

Local Video Outputs

5V PSU

DualVideo Support

ACU4201A, ACU4222A only

Remote Console

USB Devices

Figure 1 USB Micro Extender System

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SERVSWITCH™ BRAND USB MICRO EXTENDER FAMILY

2.3 Features

The ServSwitch™ Brand USB Micro Extender Series offers the following features:

• Transparent USB 2.0 Extension (low/full speed only)

Transparently extends most USB peripherals.
Remote Unit has integral 4-port USB hub.

• Supports high video resolutions for use with TFT displays

1600x1200@75Hz over 150ft (50m)

• Emulated VESA DDC (Display Data Channel)

Extender Local Unit emulates a universal monitor
Ensures maximum compatibility with multi-head graphics cards
DDC emulation on all video channels

• Local Video Output

Local video output on all video channels
Allows dual-access operation when a local USB keyboard and mouse are connected
directly to the CPU (or via a hub)

• Single and Dual-Head Video Support

One CATx cable required per channel

• Transparent serial port (on certain models)

Enables any serial device to be extended (up to 19.2K Baud). The serial port may be
used to extend one device (requiring handshaking lines), or up to three simple serial
devices (no handshaking).

• Bi-directional stereo audio support (on certain models)

16-bit digitized high-quality audio extension.

• Local Unit powered by USB

Local Unit takes power directly from USB connection. Optional 5V PSU may be
connected for video only applications or when USB power is insufficient.

• External PSU Overvoltage Protection

Remote or Local Unit will not operate if an incorrect (>5V) PSU is connected.

• Status indicator LEDs on each RJ45 port

• Small footprint chassis

• Rack mount option

Plate available to mount three units across 1U.

• Surge protection on each RJ45 port

• CPU cables included

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OVERVIEW

2.4 Product Range

There are four products in the range:

Single Video Channel Kit (Standard)

ACU4001A Single Video Channel, Transparent USB

Local Unit + Remote Unit

Single Video Channel Kit (Audio)
ACU4022A Single Video Channel, Transparent USB,

Serial, Stereo Audio
Local Unit + Remote Unit

Dual Video Channel Kit (Standard)

ACU4201A Dual Video Channels, Transparent USB

Local Unit + Remote Unit (Dual Video)

Dual Video Channel Kit (Audio)

ACU4222A Dual Video Channels, Transparent USB,

Serial, Stereo Audio
Local Unit + Remote Unit (Dual Video)

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SERVSWITCH™ BRAND USB MICRO EXTENDER FAMILY

2.5 Compatibility

Interface Compatibility

• USB: Transparent USB 2.0 Compliant link (Low/Full speed only)

Extender appears as a self-powered USB hub to the CPU.
Remote Unit contains integral USB hub with 4-ports. The extender will operate through
USB 2.0 Host Controllers. However, the speed will be restricted to that of a USB 1.1
hub (12Mb/s).

Any device that absolutely requires the high-speed mode of USB 2.0
will not be compatible with the USB Micro Extender.

• Audio: Input and output are line-level. Amplified speakers are required. A microphone

may be directly connected to the Remote Unit (optional pre-amplification).

• Serial: Transparent up to 19.2K Baud (38.4K operation may be possible with some

devices). The following serial signals are extended: TX, RX, RTS, CTS, DTR, DSR. In
rare cases, a wiring adaptor may be required to transfer RI and DCD.

• Video: VGA to UXGA. Separate or composite sync.

Emulated DDC for each video channel. Local Unit reports as monitor capable of all
resolutions and refresh rates normally used with this product. For non-standard
resolutions, choose the monitor manually through the operating system, and set to ignore
DDC.

Extender Compatibility

ServSwitch™ Brand USB Micro Extenders are not compatible with existing ServSwitch™
standalone and rack hub CAT5 extenders. Consult Technical Support for information about
compatibility with other ServSwitch™ products.

14

OVERVIEW

2.6 How to Use This Guide

This guide describes the installation and configuration of the ServSwitch™ Brand USB Micro
Extender Series. Although the connection and operation of the system is relatively
straightforward, you should consider the following before getting started:

Connection & Compatibility

Each Extender kit contains all the cables required to connect the Local Unit to your PC or
KVM switch. The remote monitor(s), USB devices and any audio and serial equipment
connects directly to the Remote Unit.

For information about connection and installation, see Installation, page 16.

Interconnection Cable

You will need CATx (any category 5, 5e, 6 or higher) cable, terminated with RJ45 plugs, to
connect the Local and Remote Units (see Interconnection Cable Requirements, page 17).

Adjusting Video

Video signals can become distorted when transmitted over CATx cables. To get the best from
your extender system, it is essential that you:

• Set the Cable Length DIP switches on the Remote Unit correctly (see Setting the Cable

Length DIP Switches on page 18).

• Use low skew CATx cable.

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SERVSWITCH™ BRAND USB MICRO EXTENDER FAMILY

3. Installation

For first-time users, we recommend that you carry out a test placement, confined to a single
room, before commencing full installation. This will allow you to identify and solve any
cabling problems, and experiment with the USB extender system more conveniently.

3.1 Package Contents

You should receive the following items in your extender package. If anything is missing,
please refer to Appendix F to obtain Technical Support.

• Extender Remote Unit.

• 5V DC universal power supply for Remote Unit.

• Extender Local Unit.

• 3ft (1.0m) USB/Video CPU combination cable with USB (A/B) connectors and VGA

video (HD15 M-F) connector.

• 3ft (1.0m) CPU video cable (1.0m) with VGA video (HD15 M-F) connector.

Models: ACU4201A and ACU4222A only.

• 3ft (1.0m) Serial cable (DB9 M-F connectors, 1:1 connections).

Models: ACU4022A & ACU4222A only.

• 3ft (1.0m) Dual audio cable (3.5mm stereo plugs).

Models:ACU4022A & ACU4222A only.

• IEC AC Power Cord.

• Quick Start Guide.

16

INSTALLATION

3.2 Interconnection Cable Requirements

To connect the Local and Remote Units you will need CATx (any category 5, 5e, 6 or higher)
cable terminated with RJ45 plugs. Please note that shielded cable is advised to maintain
regulatory EMC compliance.

Interconnect cables must be solid-core type. Stranded patch cable will give poor results over
longer distances. The pairing of the cable and pinning of its connectors should normally be in
accordance with EIA-568B (see below).

One CATx cable is required for each video channel.

• The Primary interconnect cable connects INTERCONNECT Port 1 on the Local and

Remote Units. This carries the main video channel and USB data.

• The Secondary interconnect cable connects to INTERCONNECT Port 2 on the Local

and Remote Units. This carries the additional video channel on dual-head units and/or
audio/serial data.

Technical Note: Although compatible with UTP cable, it is recommended
that shielded STP/FTP cable is used with this product, especially in
electrically noisy environments. When shielded cable is used, it is most
important to ensure that shield connectivity is maintained between the
Extender units.

Cable Pinning/Pairing

The following table illustrates which RJ45 connector pins the extenders use for various
signals. It also details the standard EIA-568B wiring scheme that is recommended for most
installations.

Looking into the RJ45 socket on a Remote Unit, Pin 1 is on the right and Pin 8 on the left.

Pin Color (EIA-568B) Signal

1
2

3
6

4
5

7
8

EIA-568A wiring can also be used. Contact Technical Support for details.

White/Orange
Orange/White

White/Green
Green/White

Blue/White
White/Blue

White/Brown
Brown/White

Blue Video

Green Video

Red Video

Data

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SERVSWITCH™ BRAND USB MICRO EXTENDER FAMILY

3.3 Remote Unit Installation

Setting the Cable Length DIP Switches

If your application uses CATx cable less than 25m in length, you can continue to the next
section.

Micro Extender Remote Units incorporate video equalization circuitry, allowing you to
compensate for the loss in image quality that occurs when video signals are transmitted along
CATx cables. At the factory, Remote Units are configured to optimize the video signals for
Interconnect cables up to 75ft (25m) in length.

If you intend to use cables of 75-150ft (25-50m) in length:

1. Locate the DIP switches on the underside of the Remote Unit. DIP switch 1 is used for

video channel 1, DIP switch 2 for video channel 2.

2. Set the DIP Switches as follows:

Interconnect Cable Length
(ft) (m)

15 – 75 5 – 25 OFF (default)
75 – 150 25 – 50 ON

If you are carrying out a test placement prior to final installation, set the DIP switch to
the position appropriate to the test cable’s length. W h en your tests are complete, set the
DIP switch to the position appropriate for the CATx cable length used in the full
installation.

DIP Switch Position

Technical Note: The video compensation does not adjust skew. Although

skew (color separation) can be an issue on some CATx cables, it would
not normally be observed on cables <150ft (50m). Even so, we still
recommend the use of low skew cables with USB Micro Extenders. You
can test for skew by viewing the online test card at:

ftp://ftp.blackbox.com/connectivity/ServSwitch/

18

INSTALLATION

Connecting the Remote Unit

To install a Remote Unit:

1. Connect your monitor, USB and other devices to the Remote Unit as shown in Figure 2

(single and dual-head units).

If additional USB hubs are attached to the extender, the maximum
extension distance could be reduced (due to the delay imposed by each
hub). For each connected hub, you may lose up to 30ft (10m) of
extension distance. Note: any USB device to which additional USB
peripherals may be attached is a USB hub (e.g. an Apple® USB
keyboard).

2. If appropriate, connect audio equipment and serial devices. Connect the audio cables as

follows:

Remote Unit Audio Device

Audio Out Speakers
Audio In (MIC) Microphone

See Appendix C: Audio/Serial Ports, page 33 for further information.

3. Connect the Primary CATx cable to the INTERCONNECT (1) socket on the front of the

Remote Unit. For dual head systems, connect an additional CATx cable to
INTERCONNECT (2) (see Figure 3).

4. Connect the 5V power supply to power the unit.

Only use the power supply originally supplied with this
equipment or a manufacturer approved replacement.

5. If you are using a flat panel TFT monitor, you must adjust the clock and/or phase

either manually or by using auto-adjust. Refer to the manual supplied with your monitor.

,

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SERVSWITCH™ BRAND USB MICRO EXTENDER FAMILY

Connect to speakers and
microphone.

Connect to second monitor.

ACU4201A, ACU4222A only

Figure 2 Remote Unit – rear view

All Remote Units

INTERCONNECT 1 – carries
primary video and USB signals.

ACU4022A and ACU4222A only

Connect to serial device, such as
a touch screen.

Connect to
primary
monitor.

ACU4022A, ACU4201A, ACU4222A only

INTERCONNECT 2 – carries secondary video
signal and audio/serial data (ACU4222A only).

Connect to
USB
devices.

All Remote Units

Connect
supplied 5V
PSU.

Status Yellow LED* Green LED

OFF

ON

No data transfer between Local and
Remote Units: not connected, or
Remote Unit not powered

Integral USB Hub functioning correctly
(enumerated and not suspended).

* Yellow LED active on primary INTERCONNECT socket (Channel 1) only

Remote Unit not powered, or
in an over-voltage (>5.6V
condition

Remote Unit powered

Figure 3 Remote Unit - front view

20

INSTALLATION

3.4 Local Unit Installation

To install a Local Unit:

1. It is recommended that the PC and other devices are switched off before connection.

2. Using the supplied CPU video/USB cable, connect the Local Unit to the CPU as shown

in Figure 4.

We recommend that the Local Unit is connected directly to a CPU
USB port (Root Hub). If the Local Unit has to be connected through an
external hub, you should ensure the hub is self-powered (not bus
powered), or connect a 5V PSU (500mA) to the Local Unit.

3. If you want local access to the CPU, connect the video output(s) on the Local Unit to

suitable monitors. Connect a USB mouse and a USB keyboard directly to other USB
ports on the CPU or a connected hub.

4. If you have an audio and serial enabled system, connect the audio cables between the

computer and Local Unit as follows:

Computer Local Unit

Audio Out (green) Audio In
Audio In/Microphone (pink/blue) Audio Out

5. If appropriate, connect the supplied serial cable between the serial port on the computer

and the Local Unit.

6. For single video units, connect the CATx cable to the INTERCONNECT socket on the

front of the Local Unit. For dual-head systems, connect the CATx cables from the
Remote Unit to the corresponding INTERCONNECT ports (1&2) on the Local Unit (see
Figure 5).

7. Power up the PC.

The Local Unit normally takes power through the USB connection. In
video only applications, or when the USB interface has limited power
(from a bus-powered hub, for example), an external 5V PSU may be
required. The power LED will indicate if an external PSU is required
(see page 23).

Please contact Technical Support to obtain a suitable power supply.

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SERVSWITCH™ BRAND USB MICRO EXTENDER FAMILY

ACU4201A and ACU4222A only

Connect to
secondary
Local monitor.

Connect to computer’s
secondary video output.

Connect to
primary Local
monitor.

Connect to
computer’s primary
video output.

All Local Units

ACU4022A and ACU4222A only

Connect to audio
ports on computer.

Connect to USB port
on CPU (or external
hub).

Connect to
serial port on
computer.

Connect to
5V PSU
(optional).

Figure 4 Local Unit - rear view

22

INSTALLATION

INTERCONNECT 1 – carries
primary video and USB signals.
Connect to CATx cable from
INTERCONNECT 1 port on
Remote Unit.

Status Yellow LED* Green LED

OFF

ON

All Models

No data transfer between Local
and Remote Units: not
connected, or Remote Unit not
powered.

Powered Remote Unit found.

ACU4022A, ACU4201A, ACU4222A only

INTERCONNECT 2 – carries secondary video
and audio/serial data (ACU4222A only).
Connect to CATx cable from
INTERCONNECT 2 port on Remote Unit.

Local Unit not powered, or in an over­voltage (>5.6V) or under-voltage
(<4.3V) condition.

Local Unit powered correctly.

* Yellow LED active on primary INTERCONNECT socket (Channel 1) only

Figure 5 Local Unit – front view

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SERVSWITCH™ BRAND USB MICRO EXTENDER FAMILY

4. Troubleshooting

4.1 Video

The image is not sharp, or is badly smeared.

Check that the cable length DIP switch is correct for the length of your Interconnect
cable (see page 18).

Check the Interconnect cable between the Remote and Local Units. Is it of the
recommended type (see page 17)? Is it intact along its entire length and securely
connected at both ends? Is it wired correctly?

Ensure that all video connections throughout the system are attached securely.
Are you using an LCD panel? You must adjust its clock and/or phase either

manually or using auto-adjust.

Colors appear to be separated and there are colored borders on text and icons.

Check the Interconnect cable between the Remote and Local Units. Is it of the
recommended type (see page 17)? Is it intact along its entire length and securely
connected at both ends? Is it wired correctly?

Are you using low skew cable? You can test for skew by viewing the online test card at:

ftp://ftp.blackbox.com/connectivity/ServSwitch/

I only need video extension – not USB - but I can’t get a picture.

Have you powered the Local Unit? The Local Unit gets its power from the CPU
through the USB connection and it will not operate without it. Use an external 5V
PSU as described on page 21.

The monitor sometimes goes blank for a second or two.

Check that the interconnect cable is not routed near power lines or other sources of
electrical interference. Use shielded STP/FTP cable instead of UTP cable and
ensure the shield connection is maintained between the Extender units.

Check system grounding.
If this is a persistent problem, contact Technical Support.

Jitter is evident on video.

Adjust the clock and/or phase on your flat-panel. Contact Technical Support if this
fails to improve the situation.

Are you testing a system using a coiled drum of CATx cable? Try uncoiling the
cable. If this solves the video jitter, you should not have a problem after full
installation.

24

TROUBLESHOOTING

I can’t select the video mode I need.

For non-standard resolutions, choose the monitor manually through the operating
system, and set to ignore DDC. Contact Technical Support if you have problems
selecting your required graphics mode.

Can the extender be used with RGB video?

Yes.

4.2 USB

Why does the Extender stop working when I attach a USB hub to the Remote Unit?

If additional USB hubs are attached to the extender, the maximum extension
distance will be reduced (due to the delay imposed by each hub). For each
connected hub, you may lose up to 10m of extension distance. Any USB device to
which additional USB peripherals may be attached is a USB hub (e.g. an Apple®
USB keyboard).

Will the USB Micro Extender work with USB 2.0?

The extender will operate perfectly through USB 2.0 Host Controllers. However,
the speed will be restricted to that of a USB 1.1 hub (12Mb/s). Devices that are
USB 2.0 compliant will operate if they are backwards compatible with USB 1.1. If
you have a device that demands the high-speed mode of USB 2.0 then it will not be
compatible with the USB Micro Extender.

Is the USB Micro Extender compatible with all USB devices?

This product range extends the distance at which USB peripherals may be operated
by making full use of the bus timeout period allowed by the USB protocol. The
extender should be compatible with the majority (but not all) of CPU USB Host
Controllers and USB peripherals on the market.

Extended USB devices are unstable and ‘drop out’.

Check that the interconnect cable is not routed near power lines or other sources of
electrical interference. Use shielded STP/FTP cable instead of UTP cable and
ensure the shield connection is maintained between the Extender units. Check
system grounding.

The extension distance is too great for your CPU/USB device combination. Try
reducing the interconnection cable length if possible.

Some of my USB devices do not operate over the full range.

The maximum extension range is nominally 150ft (50m). In practice, the maximum
distance achievable may be between 120ft (40m) and 180ft (60m) depending on
your system and USB devices. Adding external USB hubs may decrease the
maximum extension distance by up to 30ft (10m) for each hub added. Adding bus­powered hubs in front of the Local Unit is not recommended.

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SERVSWITCH™ BRAND USB MICRO EXTENDER FAMILY

4.3 Audio

The audio is very quiet.

The audio I/O is line-level and requires amplified speakers and connection to
devices providing line-level I/O.

The audio is loud but distorted.

Check that the audio input is not greater than line level (4V peak-to-peak). The
USB Micro Extender accepts line-level audio input only.

The microphone output is barely audible.

See Appendix C: Audio/Serial Ports, page 33.

No audio on ACU4022A.

You need to connect the second interconnect cable which is used to carry audio and
serial data.

4.4 Serial

My serial device does not function.

The extender supports serial devices at data rates not exceeding 19.2K Baud
(although 38.4K operation might be possible with certain equipment).

Check the type of flow control used by the device and CPU. The extender supports
RTS, CTS, DTR, and DSR. Some systems may require a wiring adapter to transfer
RI and DCD.

Attach the device directly to the serial port on the PC and test whether the problem
is a PC or extender problem.

Some serial devices cannot be hot-plugged. Try connecting the device to a powered
Remote Unit prior to booting the system.

26

TROUBLESHOOTING

4.5 General Questions

The green power LED is not lit when I connect my Local Unit to my USB hub.

Local Units normally take power from the USB connection to the computer. Local
Units may require an external 5V PSU:

- If the CPU/hub cannot provide sufficient power through the USB connection.

- For video only applications.
Contact Technical Support for details of a suitable PSU.

Is it possible to use a cable length longer than 150ft (50m)?

The maximum extension distance is nominally 150ft (50m). Some systems may
extend up to 180ft (60m) and others only 120ft (40m). Once the system range limit
is reached, USB operation will cease or become erratic. For maximum extension
distance, avoid connecting additional USB hubs to the system.

Which interconnection cable is best?

The extender will operate with either shielded (STP/FTP) or unshielded (UTP)
CATx cable. However, correctly installed shielded cable is preferred, especially in
electrically noisy environments, because it resists interference more strongly, limits
ground potential differences, and reduces emissions. To benefit from shielded cable
the shield connection must be maintained from end to end through any intervening
patch cables, panels and RJ45 connectors.

Please note that shielded cable is advised in order to maintain regulatory EMC
compliance.

Can I use CATx patch cables?

Yes, but to ensure maximum data integrity, use as few as possible. The maximum
patch cable length at each end of the link should be limited to 9ft (3m).

Can the extender system be used between buildings?

No. Ground loops could damage the extender system and attached equipment.

Can multiple Local/Remote Units be used by swapping the interconnection cable?

Local Units provide a transparent USB link, so it is possible to swap or switch the
local-remote interconnection to create a matrix-switch system. Please call Technical
Support before deploying such a system.

Can the extender be connected into our network?

Absolutely not. Regardless of the cable similarities, the data signals and voltages
used by the extender are different to those used by Ethernet and other types of
networks. Connecting the extender to a LAN hub, switch, repeater, or other
network device, or exposing it to the signal levels present on network data lines
may damage the extender and other devices.

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SERVSWITCH™ BRAND USB MICRO EXTENDER FAMILY

Appendix A: Example Applications

This section illustrates three specific applications using USB Micro Extender units:

• Simple system using ACU4001A to provide remote console with extended USB

keyboard, mouse and printer (Figure 6). Audio extended by USB using USB-to-Audio
converter at the Remote Unit (not included).

• Dual-monitor consoles with serial and audio extension (Figure 7). Analog audio

extended without USB conversion using Interconnect 2 and monitor 2 at the remote
console is a serial touch screen. Uses ACU4222A.

• ACU4222A configured for home entertainment system with extension of USB devices

(remote control, game pad, keyboard a nd mouse) and video (Figure 8). Use of USB
Micro Extender allows clutter and noise of CPU to be removed from viewing area.

For more specific information about these, or any other complex applications, please discuss
suitable extension architecture with Technical Support.

28

APPENDIX A: EXAMPLE APPLICATIONS

CPU

Keyboard and mouse for
Local console connect to
spare USB ports or hub.

ACU4001A Remote Unit

Video output and four USB
ports for extended devices:
keyboard, mouse, printer,
audio (requires USB-to-Audio
converter – not supplied).

Local Console

ACU4001A Local Unit

Takes video and USB signals
from CPU. Also provides video
output for Local console.

Remote Console

Figure 6 Single monitor consoles with audio extension using USB-to-

Audio converter (not supplied)

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SERVSWITCH™ BRAND USB MICRO EXTENDER FAMILY

A

CPU

Keyboard and mouse for
Local console connect to
spare USB ports or hub.

ACU4222A Local Unit

Takes video and USB signals
from CPU. Also provides video
outputs for Local console.

Local Console

Dual monitor console.

CU4222A Remote Unit

Video, audio/serial output and
four USB ports for extended
devices: keyboard, mouse,
graphics tablet, USB drive.

Remote Console

Dual monitor console.
Monitor 2 is serial touch screen.

Figure 7 Dual-monitor consoles with serial and au dio extension

30

APPENDIX A: EXAMPLE APPLICATIONS

A

CPU

Keyboard and mouse for
Local console connect to
spare USB ports or hub.

ACU4222A Local Unit

Takes video and USB signals
from CPU. Also provides video
output for Local console.

Local Console

CU4222A Remote Unit

Video and audio output and
four USB ports for extended
devices: keyboard, mouse,
remote control and game pad.

Remote Console

Figure 8 Home entertainment system

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SERVSWITCH™ BRAND USB MICRO EXTENDER FAMILY

Appendix B: Rack Mount Options

All USB Micro Extender units can be mounted in a 19” rack in any combination using the
mounting kit: RMK19U-X3

RMK19U-X3 Mounting Kit

This mounting kit allows you to mount up to three units across 1U. It contains one rack plate
and M3 countersunk mounting screws.

To mount a unit:

1. Remove the feet from the extender unit.

2. Align the holes on the base plate with the vacant screw holes on the base of the extender

unit.

3. Fasten the base of the unit to the plate of the mounting kit using the supplied screws.

Figure 9 RMK19U-X3 Mounting Kit

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APPENDIX C: AUDIO/SERIAL PORTS

Appendix C: Audio/Serial Ports

Operation & Multi-Port Configuration

This appendix describes audio & serial interface operation for ACU4022A and ACU4222A.
This extender allows bi-directional stereo audio and a full-duplex serial data to be sent across

the secondary CATx interconnection cable.

Serial Interface - Set Up and Operation

No setting up or user adjustments are required.
The Remote Unit’s serial port is wired as DTE - the same as that on a PC. To connect a serial

printer or other DTE (rather than DCE device) to the Remote Unit, you will need a Null­Modem crossover cable between the Remote Unit and the printer. Select Xon/Xoff software
flow control on the printer and PC.

A serial touch screen may be plugged directly into the Remote Unit.

Serial Interface – Handling Multiple Serial Devices

The extender’s serial interface transmits/receives six signals (3 signals in each direction).
Normally, four of these signals are used for hardware handshaking (in addition to TX & RX).

However, because each handshaking line can support signals up to 19,200 Baud it is possible
to configure the serial interface to handle up to three simple 2-wire (Tx/Rx only) serial links.

To do this, you will need to construct a custom breakout cable. Please contact Technical
Support for further information.

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SERVSWITCH™ BRAND USB MICRO EXTENDER FAMILY

Audio Interface - Set Up and Operation

The audio interface is line-level and is designed to take the output from a sound card (or other
line-level) source and be connected to a set of powered speakers at the other end of the link.

Stereo audio may be transmitted either way across the link (simultaneously).
No setup is required unless a microphone is connected to the Remote Unit.
Connect the extender as follows:

• Take the line-level output from your sound card (green connector) and connect to ‘Line

In’ on the Local Unit.

• Connect ‘Line Out’ on the Remote Unit to a set of powered speakers.

Audio Interface – Using a Microphone

A microphone may be plugged into the ‘Line In’ connector on the Remote Unit.
There are two ways of setting up a microphone:

• The Local Unit’s ‘Line Out’ connection should normally be wired to the microphone

input (Pink) on your sound card. The sound card should then be set up to provide
additional amplification (+17dB). This is the preferred connection method.

• Alternatively, the Remote Unit itself can provide microphone amplification. To set this,

open up the Remote Unit and locate the jumper labeled ‘MIC’ on the daughter board.
Connect this jumper across the pins. The Local Unit’s ‘Line Out’ connection should then
be wired to ‘Line In’ (Blue) on your sound card.

If your microphone is already amplified, follow the second method but DO NOT install the
amplification jumper in the Remote Unit.

34

APPENDIX D: CALLING BLACK BOX

Appendix D: Calling Black Box

If you determine that your USB Micro Extender is malfunctioning, do not attempt to alter or
repair it. It contains no user-serviceable parts. Contact Black Box Technical Support 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 firmware-revision level printed on the bottom of the Extender (very important,

especially for keyboard and mouse problems); The USB Micro Extender’s firmware
revision level:

Version Number Format: xxSyy/zz
xx is the hardware revision number
yy is the firmware revision number
zz is the auxiliary revision number.

• The nature and du ration of the probl em.

• When the problem occurs.

• The components involved in the problem—that is, what type of computers, what type of

keyboard, brand of mouse, make and model of monitor, type and make of CATx cable,
etc.

• Any particular application that, when used, appears to create the problem or make it

worse.

• The results of any testing you’ve already done.
To solve some problems, it might be necessary to upgrade the Extender’s firmware. If this

turns out to be the case for your difficulty, our Technical Support technicians will arrange for
you to receive the new firmware and will tell you how to install it.

Shipping and Packaging

If you need to transport or ship your USB Micro Extender:

• Package it carefully. We recommend that you use the original container.

• If you are shipping it for repair, please include the Remote Unit’s external power supply.

If you are returning it, please include everything you received with it. Before you ship
the Extender back to Black Box for repair or return, contact us to get a Return
Authorization (RA) number.

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SERVSWITCH™ BRAND USB MICRO EXTENDER FAMILY

Appendix E: Specifications

Video

Maximum Resolution

Video Compatibility
Video I/O
Video Compensation
Video Coupling
Sync I/O

VESA DDC

Video Input Connectors
Video Output Connectors

USB

USB Compatibility

Extension Limits

Local Unit Connector
Remote Unit Connectors

1600x1200@75Hz over 150ft (50m)
Operation at higher resolutions/refresh rates may be

possible at shorter distances
VGA to UXGA, RGB

0.7V P-P
2-stage
DC
Separate/Composite TTL Level

Sync Polarity is preserved
Emulated DDC for each video channel

(all standard modes).
HD15 (Male)
HD15 (Female)

Transparent USB 2.0 compliant link
(low/full speed only)
Extender appears as a self-powered USB 1.1 hub to the
CPU. Remote Unit contains integral USB 1.1 hub with
4 ports.

150ft (50m) nominal
Maximum distance achievable may vary between 120ft

(40m) and 180ft (60m) depending on system. Adding
external USB hubs may decrease the maximum
extension distance by up to 30ft (10m) for each hub
added.

Adding bus-powered hubs in front of the Local Unit is
not recommended.

USB B Socket
4 x USB A Sockets

36

APPENDIX E: SPECIFICATIONS

Serial Interface

Max Baud Rate Supported
Serial Data Format
Signals Transferred
Local Unit Connector
Remote Unit Connector

Audio Interface

Description
Transmission method
Signal levels
Input Impedance

Local Unit Connectors
Remote Unit connectors
Microphone Support

Power Requirements

19.2K Baud
Transparent
TX, RX, RTS, CTS, DTR, DSR
DB9 Female (DCE)
DB9 Male (DTE)

Bi-directional stereo audio link
Digitized virtually CD quality audio (16-bit, 38.4kHz)
Line level (4 Volts Pk-Pk maximum)

47kΩ
2x3.5mm stereo jack socket (Line In & Line Out)
2x3.5mm stereo jack socket (Line/Mic In & Line Out)
Microphone may be connected to Remote Unit

Pullup resistor provides bias for condenser microphone
Option to set microphone amplification to +17dB

Local Unit

Remote Unit

5V at up to 275mA supplied by USB port
External PSU may also be connected to 2.1mm DC Jack
(Center Positive)
Over Voltage Protection: >6.0V
Under Voltage Indication: <4.3V

5V, 3A (18W) Regulated PSU included
(certified to all relevant safety standards)
Universal IEC Input
Connector: 2.1mm DC Jack (Center Positive)
Remote Unit takes 250mA, remainder available for
connected USB devices (1.1A fused).
Over Voltage Protection: >6.0V

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SERVSWITCH™ BRAND USB MICRO EXTENDER FAMILY

Size and Shipping Weight

ACU4001A

ACU4022A

ACU4201A

ACU4222A

Environmental

Operating Temperature
Storage Temperature
Relative Humidity
Chassis Construction

Local Unit: 4.7”x4.3”x1.1” (120x110x29mm)
Remote Unit: 5.4”x3.9”x1.1” (138x98x29mm)
Shipping Weight: 3.3lb (1.5kg)

Local Unit: 4.7”x4.3”x1.7” (120x110x44mm) (1U)
Remote Unit: 5.4”x3.9”x1.7” (138x98x44mm) (1U)
Shipping Weight: 3.7lb (1.7kg)

Local Unit: 4.7”x4.3”x1.7” (120x110x44mm) (1U)
Remote Unit: 5.4”x3.9”x1.1” (138x98x29mm)
Shipping Weight: 3.7lb (1.7kg)

Local Unit: 5.9”x4.3”x1.7” (145x110x44mm) (1U)
Remote Unit: 5.4”x3.9”x1.7” (138x98x44mm) (1U)
Shipping Weight: 6.6lb (2.0kg)

32 to 104°F (0 to 40 °C)

-22 to 149°F (-30 to 65 °C)
5-90% non-condensing
Fully shielded. Black painted steel

38

NOTES

NOTES

Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500)

Customer Support Information:

For 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 Dr., Lawrence, PA 15055-1018

World-Wide Web: www.blackbox.com • Email: [e-mail]

© Copyright 2009. Black Box Corporation. All rights reserved.