ATEN US221A User manual

US221A / US421A
USB 2.0 Peripheral Switch
User Manual

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Compliance Statements
FEDERAL COMMUNICATIONS COMMISSION
INTERFERENCE STATEMENT
This equipment has been tested and found to comply with the
limits for a Class B digital service, pursuant to Part 15 of the
FCC rules These limits are designed to provide reasonable
protection against harmful interference in a residential
installation Any changes or modifications made to this
equipment may void the user’s authority to operate this
equipment This equipment generates, uses, and can radiate
radio frequency energy If not installed and used in accordance
with the instructions, may cause harmful interference to radio
communications However, there is no guarantee that
interference will not occur in a particular installation If this
equipment does cause harmful interference to radio or television
reception, which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the interference
by one or more of the following measures:
Reorient or relocate the receiving antenna
Increase the separation between the equipment and receiver
Connect the equipment into an outlet on a circuit different
from that to which the receiver is connected
Consult the dealer or an experienced radio/TV technician
for help
The device complies with Part 15 of the FCC Rules Operation
is subject to the following two conditions: (1) this device may
not cause harmful interference, and (2) this device must accept
any interference received, including interference that may cause
undesired operation

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FCC Caution: Any changes or modifications not expressly
approved by the party responsible for compliance could void the
user's authority to operate this equipment
KCC Statement
RoHS
This product is RoHS compliant

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US221A / US421A
User Manual
Online Registration
You can register your product at our online support center:
Online Support
International
Telephone Support
For telephone support, call this number:
International http://support.aten.com
Email Support [e-mail]
Online
Support
Technical Support http://support.aten.com
Troubleshooting
ocumentation
Software Updates
http://www.aten.com
International 886-2-8692-6959
China 86-400-810-0-810
Japan 81-3-5615-5811
Korea 82-2-467-6789
North America 1-888-999-ATEN ext 4988
1-949-428-1111

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North America
Email Support [e-mail]
Online
Technical
Support
Troubleshooting
ocumentation
Software
Updates
http://www.aten-usa.com/support
Telephone Support 1-888-999-ATEN ext 4988
1-949-428-1111

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Package Contents
Check to make sure that all the components are in working order.
If you encounter any problem, please contact your dealer.
The US221A / US421A USB 2.0 Peripheral Switch package
contains the following items:
 1 2-port (US221A) or 4-port (US421A) USB 2.0 Peripheral
Switch
 1 1.8 m USB Type A to USB Type B Cable
 1 User Instructions*
Read this manual thoroughly and follow the installation and
operation procedures carefully to prevent any damage to the unit
or any connected devices.
*The product may be updated, with features and functions
added, improved or removed since the release of this manual.
For an up-to-date US221A / US421A documentation, visit http:/
/www.aten.com/global/en/

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Overview
The US221A / US421A is a 2/4-port USB 2.0 Peripheral Switch
that allows up to 2/4 computers to share the use of a single USB
peripheral device (such as a printer, scanner, mass storage drive,
etc.*) on a one-at-a-time basis.
The peripheral focus can be given to a computer manually by
using pushbuttons on the switch or by using the software-based
configuration utility. In addition, the US221A / US421A has a new
Auto Switch function that stores commands sent to the USB
peripheral device to be processed on a first-come, first-served
basis, meaning that a print server is not required.
Compatible with both Windows and Mac, and with multifunction
printer support, the US221A / US421A is the ideal way to share
the latest USB 2.0 peripherals in a multimedia SOHO
environment.
Note: The US221A / US421A does not support a USB hub
peripheral device.

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Features
 Enables two (US221A) or four (US421A) computers to share
a single USB peripheral device
 Simple port selection via pushbuttons or easy-to-use
configuration utility
 Auto Switch function – no need for a separate print server
 USB 2.0 compliant
 Supports transfer rates up to 480 Mbps
 Multiplatform support – Windows and Mac
 LE indicators display port focus
 Overcurrent protection
 Bus-powered
 Hot pluggable
 Buzzer indicates switching between computers
 Supports multifunction printers

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System Requirements
Computers
The following equipment must be installed on each computer that
is to be connected to the system:
 USB host controller
Cables
 USB to USB cables to connect the computers to the
peripheral device.
Note: Only one USB Type A to USB Type B cable is provided
in the US221A / US421A package. You will need to
purchase an additional USB Type A to USB Type B
cables for each computer you wish to connect to the
US221A / US421A.
Operating Systems
Supported operating systems are shown in the table, below:
OS Version
Windows 2000, XP, 2003, 2008, Vista
Mac OS X 10.4.5, 10.5

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