SMC Networks SMCWUSBS-N User Manual

EZ Connect Draft 11n Wireless USB2.0 Adapter
TM
N
SMCWUSBS-N
The easy way to make all your network connections
20 Mason Irvine, CA 92618 Phone: (949) 679-8000
Pub. # 149100040600E
October 2007
E102007-EK-R01
Information furnished by SMC Networks, Inc. (SMC) is believed to be accurate and reliable. However, no responsibility is assumed by SMC for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SMC. SMC reserves the right to change specifications at any time without notice.
Copyright © 2007 by
SMC Networks, Inc.
20 Mason
Irvine, CA 92618
All rights reserved. Printed in Taiwan
Trademarks: SMC is a registered trademark; and EZ Switch, TigerStack and TigerSwitch are
trademarks of SMC Networks, Inc. Other product and company names are trademarks or registered trademarks of their respective holders.
Limited Warranty
Limited Warranty Statement: SMC Networks, Inc. (“SMC”) warrants its products to be
free from defects in workmanship and materials, under normal use and service, for the applicable warranty term. All SMC products carry a standard 90-day limited warranty from the date of purchase from SMC or its Authorized Reseller. SMC may, at its own discretion, repair or replace any product not operating as warranted with a similar or functionally equivalent product, during the applicable warranty term. SMC will endeavor to repair or replace any product returned under warranty within 30 days of receipt of the product.
The standard limited warranty can be upgraded to a Limited Lifetime* warranty by registering new products within 30 days of purchase from SMC or its Authorized Reseller. Registration can be accomplished via the enclosed product registration card or online via the SMC Web site. Failure to register will not affect the standard limited warranty. The Limited Lifetime warranty covers a product during the Life of that Product, which is defined as the period of time during which the product is an “Active” SMC product. A product is considered to be “Active” while it is listed on the current SMC price list. As new technologies emerge, older technologies become obsolete and SMC will, at its discretion, replace an older product in its product line with one that incorporates these newer technologies. At that point, the obsolete product is discontinued and is no longer an “Active” SMC product. A list of discontinued products with their respective dates of discontinuance can be found at: http://www.smc.com/index.cfm?action=customer_service_warranty.
All products that are replaced become the property of SMC. Replacement products may be either new or reconditioned. Any replaced or repaired product carries either a 30-day limited warranty or the remainder of the initial warranty, whichever is longer. SMC is not responsible for any custom software or firmware, configuration information, or memory data of Customer contained in, stored on, or integrated with any products returned to SMC pursuant to any warranty. Products returned to SMC should have any customer-installed accessory or add-on components, such as expansion modules, removed prior to returning the product for replacement. SMC is not responsible for these items if they are returned with the product.
Customers must contact SMC for a Return Material Authorization number prior to returning any product to SMC. Proof of purchase may be required. Any product returned to SMC without a valid Return Material Authorization (RMA) number clearly marked on the outside of the package will be returned to customer at customer’s expense. For warranty claims within North America, please call our toll-free customer support number at (800) 762-4968. Customers are responsible for all shipping charges from their facility to SMC. SMC is responsible for return shipping charges from SMC to customer.
WARRANTIES EXCLUSIVE: IF AN SMC PRODUCT DOES NOT OPERATE AS WARRANTED ABOVE, CUSTOMER’S SOLE REMEDY SHALL BE REPAIR OR REPLACEMENT OF THE PRODUCT IN QUESTION, AT SMC’S OPTION. THE FOREGOING WARRANTIES AND REMEDIES ARE EXCLUSIVE AND ARE IN LIEU OF ALL OTHER WARRANTIES OR CONDITIONS, EXPRESS OR IMPLIED, EITHER IN FACT OR BY OPERATION OF LAW, STATUTORY OR OTHERWISE, INCLUDING WARRANTIES OR CONDITIONS OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. SMC NEITHER ASSUMES NOR AUTHORIZES ANY OTHER PERSON TO ASSUME FOR IT ANY OTHER LIABILITY IN CONNECTION WITH THE SALE, INSTALLATION, MAINTENANCE OR USE OF ITS PRODUCTS. SMC SHALL
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NOT BE LIABLE UNDER THIS WARRANTY IF ITS TESTING AND EXAMINATION DISCLOSE THE ALLEGED DEFECT IN THE PRODUCT DOES NOT EXIST OR WAS CAUSED BY CUSTOMER’S OR ANY THIRD PERSON’S MISUSE, NEGLECT, IMPROPER INSTALLATION OR TESTING, UNAUTHORIZED ATTEMPTS TO REPAIR, OR ANY OTHER CAUSE BEYOND THE RANGE OF THE INTENDED USE, OR BY ACCIDENT, FIRE, LIGHTNING, OR OTHER HAZARD.
LIMITATION OF LIABILITY: IN NO EVENT, WHETHER BASED IN CONTRACT OR TORT (INCLUDING NEGLIGENCE), SHALL SMC BE LIABLE FOR INCIDENTAL, CONSEQUENTIAL, INDIRECT, SPECIAL, OR PUNITIVE DAMAGES OF ANY KIND, OR FOR LOSS OF REVENUE, LOSS OF BUSINESS, OR OTHER FINANCIAL LOSS ARISING OUT OF OR IN CONNECTION WITH THE SALE, INSTALLATION, MAINTENANCE, USE, PERFORMANCE, FAILURE, OR INTERRUPTION OF ITS PRODUCTS, EVEN IF SMC OR ITS AUTHORIZED RESELLER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
SOME STATES DO NOT ALLOW THE EXCLUSION OF IMPLIED WARRANTIES OR THE LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES FOR CONSUMER PRODUCTS, SO THE ABOVE LIMITATIONS AND EXCLUSIONS MAY NOT APPLY TO YOU. THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, WHICH MAY VARY FROM STATE TO STATE. NOTHING IN THIS WARRANTY SHALL BE TAKEN TO AFFECT YOUR STATUTORY RIGHTS.
* SMC will provide warranty service for one year following discontinuance from the active SMC price list. Under the limited lifetime warranty, internal and external power supplies, fans, and cables are covered by a standard one-year warranty from date of purchase.
SMC Networks, Inc.
20 Mason
Irvine, CA 92618
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Compliances
Federal Communication Commission Interference Statement
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, 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 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
This 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.
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.
IMPORTANT NOTE: FCC Radiation Exposure Statement
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. End users must follow the specific operating instructions for satisfying RF exposure compliance.
This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter.
IEEE 802.11b or 802.11g operation of this product in the U.S.A. is firmware-limited to channels 1 through 11.
Canada RSS Statement
This Class B digital apparatus complies with Canada RSS-210. Cet appareil numérique de la classe B est conforme à la norme CNR-210 du Canada.
Canada IC Statement
1. This device may not cause interference.
2. This device must accept any interference, including interference that may
cause undesired operation of the device.
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Australia/New Zealand AS/NZS 4771
Japan VCCI Class B
Taiwan DGT (NCC)
根據交通部低功率管理辦法規定:
第十二條 經型式認證合格之低功率射頻電機,非經許可,公司、商號或使用者均不得擅
自變更頻率、加大功率或變更原設計之特性及功能。
第十四條 低功率射頻電機之使用不得影響飛航安全及干擾合法通信;經發現有干擾現象
時,應立即停用,並改善至無干擾時方得繼續使用。前項合法通信,指依電信 法規定作業之無線電通信。低功率射頻電機須忍受合法通信或工業、科學及醫 療用電波輻射性電機設備之干擾。
EC Conformance Declaration
Marking by the above symbol indicates compliance with the Essential Requirements of the R&TTE Directive of the European Union (1999/5/EC). This equipment meets the following conformance standards:
• EN 60950-1 (IEC 60950-1) - Product Safety
• EN 300 328 - Technical requirements for 2.4 GHz radio equipment
• EN 301 489-1, EN 301 489-17 - EMC requirements for radio equipment
This device is intended for use in the following European Community and EFTA countries:
• Austria • Belgium • Cyprus • Czech Republic • Denmark
• Estonia • Finland • France • Germany • Greece
• Hungary • Iceland • Ireland • Italy • Latvia
• Liechtenstein • Lithuania • Luxembourg • Malta • Netherlands
• Norway • Poland • Portugal • Slovakia • Slovenia
• Spain • Sweden • Switzerland • United Kingdom
Requirements for indoor vs. outdoor operation, license requirements and allowed channels of operation apply in some countries as described below:
• In Italy the end-user must apply for a license from the national spectrum authority to operate this device outdoors.
• In Belgium outdoor operation is only permitted using the 2.46 - 2.4835 GHz band: Channel 13.
• In France outdoor operation is only permitted using the 2.4 - 2.454 GHz band: Channels 1 - 7.
ii
Council recommendation 1999/519/EC of 12 July 1999, limitations of exposure of the
Σ
A p
Š
ymog
p
general public to electromagnetic fields (0 Hz to 300 GHz)
Czech
Danish
German Hiermit erklärt SMC Networks, dass sich dieses Wireless LAN Gerat in Übereinstimmung mit
Estonian Käesolevaga kinnitab SMC Networks seadme Radio LAN device vastavust direktiivi 1999/5/
English Hereby, SMC Networks, declares that this Radio LAN device is in compliance with the
Spanish Por medio de la presente SMC Networks declara que el Radio LAN device cumple con los
Greek
French Par la présente SMC Networks déclare que l'appareil Radio LAN device est conforme aux
Italian Con la presente SMC Networks dichiara che questo Radio LAN device è conforme ai requisiti
Latvian
Lithuanian
Dutch Hierbij verklaart SMC Networks dat het toestel Radio LAN device in overeenstemming is met
Maltese Hawnhekk, SMC Networks, jiddikjara li dan Radio LAN device jikkonforma mal-htigijiet
Hungarian Alulírott, SMC Networks nyilatkozom, hogy a Radio LAN device megfelel a vonatkozó
Polish
Portuguese SMC Networks declara que este Radio LAN device está conforme com os requisitos
Slovak
Finnish SMC Networks vakuuttaa täten että Radio LAN device tyyppinen laite on direktiivin 1999/5/EY
Swedish Härmed intygar SMC Networks att denna Radio LAN device står I överensstämmelse med de
SMC Networks tímto prohlašuje, že tento Radio LAN device je ve shodě se základními požadavky a dalšími příslušnými ustanoveními směrnice 1999/5/ES.
Undertegnede SMC Networks erklærer herved, at følgende udstyr Radio LAN devic e overholder de væsentlige krav og øvrige relevante krav i direktiv 1999/5/EF.
den grundlegenden Anforderungen und den anderen relevanten Vorschriften der Richtlinie 1999/5/EG befindet. Die offizielle EC-Declaration of Conformity finden Sie im Internet unter http://www.smc.com
unter der entsprechenden Produktkategorie.
EÜ põhinõuetele ja nimetatud direktiivist tulenevatele teistele asjakohastele sätetele.
essential requirements and other relevant provisions of Directive 1999/5/EC. The official EC-Declaration of Conformity can be found under the corresponding product section on the web http://www.smc.com
requisitos esenciales y cualesquiera otras disposiciones aplicables o exigibles de la Directiva 1999/5/CE. The official EC-Declaration of Conformity can be found under the corresponding product section on the web http://www.smc.com
ΜΕ ΤΗΝ ΠΑΡΟΥΣΑ SMC Networks ΔΗΛΩΝΕΙ ΟΤΙ Radio LAN device ΣΥΜΜΟΡΦΩΝΕΤΑΙ ΠΡΟ ΤΙΣ ΟΥΣΙΩΔΕΙΣ ΑΠΑΙΤΗΣΕΙΣ ΚΑΙ ΤΙΣ ΛΟΙΠΕΣ ΣΧ ΕΤΙΚΕ Σ ΔΙΑΤΑΞΕΙΣ ΤΗΣ ΟΔΗΓΙΑΣ
1999/5/ΕΚ.
exigences essentielles et aux autres dispositions pertinentes de la directive 1999/5/CE. La declaration de conformité officielle peut être trouvée sur notre site internet http://www.smc.com
.
.
dans la rubrique Produits.
essenziali ed alle altre disposizioni pertinenti stabilite dalla direttiva 1999/5/CE.
r šo SMC Networks deklarē, ka Radio LAN device atbilst Direktīvas 1999/5/EK būtiskajām rasībām un citiem ar to saistītajiem noteikumiem.
iuo SMC Networks deklaruoja, kad šis Radio LAN device atitinka esminius reikalavimus ir kitas
1999/5/EB Direktyvos nuostatas.
de essentiële eisen en de andere relevante bepalingen van richtlijn 1999/5/EG. Het officiële EC- gelijkvormigheidattest kan men vinden op de internetsite http://www.smc.com betrokken productcategorie.
onder de
essenzjali u ma provvedimenti ohrajn relevanti li hemm fid-Dirrettiva 1999/5/EC.
alapvetõ követelményeknek és az 1999/5/EC irányelv egyéb elõírásainak.
Niniejszym SMC Networks oświadcza, że Radio LAN device jest zgodny z zasadniczymi w
ami oraz pozostałymi stosownymi postanowieniami Dyrektywy 1999/5/EC.
essenciais e outras disposições da Directiva 1999/5/CE.
SMC Networks týmto vyhlasuje, že Radio LAN device spĺňa základné požiadavky a všetky
ríslušné ustanovenia Smernice 1999/5/ES.
oleellisten vaatimusten ja sitä koskevien direktiivin muiden ehtojen mukainen
väsentliga egenskapskrav och övriga relevanta bestämmelser som framgår av direktiv 1999/5/ EG
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Icelandic
g
Norwegian
Hér með lýsir SMC Netwo rks yfir því að Radio LAN device er í samræmi við grunnkröfur og aðrar kröfur, sem gerðar eru í tilskipun 1999/5/EC.
SMC Networks erklærer herved at utstyret Radio LAN device er i samsvar med de
runnleggende krav og øvrige relevante krav i direktiv 1999/5/EF.
iv
Countries of Operation & Conditions of Use in EC / EFTA member states
English This device is a 2.4 GHz wireless LAN transceiver, intended for indoor home and office use in
French Ce produit est un appareil radio LAN transceiver de 2.4 GHz destiné aux PME et a l’utilisation
Dutch Dit toestel is een 2.4 Ghz draadloze Lan transceiver, bestemd voor gebruik binnen huis en
Spanish Este aparato es un transmisor inalambrico de 2.4 GHz, previsto para el uso interior en
German Dieses Wireless LAN Gerat arbeitet im 2.4 GHz Frequenzband und ist fur den Einsatz im
all notified EC and EFTA member states. In accordance with article 6.4 of the R&TTE Directive 1999/5/EC the following EC/ EFTA member states have been notified: Austria, Belgium, Denmark, Finland, France, Germany, Italy, Luxembourg, Netherlands, Norway, Spain, Sweden, Switzerland, United Kingdom, Portugal, Greece, Ireland, Iceland. Requirements for outdoor operation, like license requirements and allowed channels of operation apply in some countries. Please contact your local regulation authority or SMC Networks for details on current restrictions for outdoor use.
domestique dans tous les pays certifiés conformes aux conditions de l’EU et de l’EFTA. En accord avec l’article 6.4 de la R&TTE directive 1999/5/EC, the membres de la EU et de l’EFTA sont les suivants: Autriche, Belgique, Danemark, finalnde, France, Allemagne, Italie, Luxembourg, Pays-Bas, Norvège, Espagne, Suède, Suisse, Royaume-Uni, Portugal, Grèce, Irelande, Icelande. Des conditions sont appliquées à certains pays pour l’utilisation en extérieur, tels que des licences spécifiques et des canaux d’opération. Veuillez contacter votre autorité locale ou SMC Networks pour plus de détails quant aux restrictions actuelles concernant l’utilisation en extérieur.
kantoor in alle geïnformeerde lidstaten van de EC en de EFTA. In overeenstemming met artikel 6.4 van de R&T TE Directive 1999/5/EC zijn de volgende EC/
EFTA lidstaten verwittigd: België, Denemarken, Duitsland, Finland, Frankrijk,Griekenland, Ierland, IJsland, Italië,
Luxemburg, Nederland, Noorwegen,Oostenrijk, Portugal, Spanje , Verenigd Koninkrijk, Zweden, Zwitserland.
Benodigdheden voor gebruik buiten, zoals gebruiksvergunningen en toegelaten werkkanalen zijn van toepassing in sommige landen. Gelieve uw lokale instantie of SMC Networks te contacteren voor details op huidige beperkingen voor gebruik in buitenlucht.
domicilios y Pymes en todos los Estados de la CE y la EFTA notificados. De acuerdo con el artículo 6.4 de la Directiva R&TTE 1999/5/EC los siguientes estados de la CE y de la EFTA han sido notificados: Austria, Bélgica, Dinamarca, Finlandia, Francia, Alemania, Italia, Luxemburgo, Países Bajos, Noruega, Espana, Suecia, Suiza, Reino Unido, Portugal, Grecia, Irlanda, Islandia. Los requisitos para su uso exterior, como requerimiento de licencia y canales de operación permitidos se aplican en algunos paises. Por favor contacte la autoridad reguladora local o SMC Networks para más detalles en relacion con las restricciones actuales para uso exterior.
Innenbereich in den benachrichtigten EC/ EFTA Mitgliedstaaten geeignet. In Übereinstimmung mit Artikel 6.4 der R&TTE Direktive 1999/5/EC wurden folgende Mitgliedstaaten benachrichtigt: Österreich, Belgien, Dänemark, Finland, Frankreich, Deutschland, Italien, Luxemburg, Niederlande, Norwegen, Spanien, Schweden, Schweiz, Großbritannien, Portugal, Griechenland, Irland, Island. Für den Einsatz im Aussenbereich sind in einigen Ländern Lizenzen erforderlich oder die Anzahl der Kanäle ist eingeschränkt. Bitte kontaktieren Sie Ihre Regulierungsbehörde oder SMC Networks für die aktuellen Einschrankungen beim Einsatz im Aussenbereich.
SMC Contact for this device in Europe is: SMC Networks Europe,
Edificio Conata II, Calle Fructuos Gelabert 6-8, 2, 4a, 08970 - Sant Joan Despi, Barcelona, Spain
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About This Guide
Purpose
This guide details the hardware features of the wireless USB adapter, including its physical and performance-related characteristics, and how to install the device and use its configuration software.
Audience
This guide is for PC users with a working knowledge of computers. You should be familiar with Windows operating system concepts.
Conventions
The following conventions are used throughout this guide to show information: Note: Emphasizes important information or calls your attention to related features or
instructions.
Caution: Alerts you to a potential hazard that could cause loss of data, or damage the
system or equipment.
Warning: Alerts you to a potential hazard that could cause personal injury.
Related Publications
The following publication gives basic information on how to install and use the wireless USB adapter.
Quick Installation Guide
Also, as part of the the wireless USB adapter’s software, there is online help that describes all configuration related features.
Revision History
This section summarizes the changes in each revision of this guide.
October 2007 Revision
This is the first revision of this guide.
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vi
Contents
Chapter 1: Introduction 1-1
Features 1-1 System Requirements 1-2 Package Checklist 1-2 Hardware Description 1-2 LED Indicators 1-3 WPS Button 1-3
Chapter 2: Driver and Utility Installation 2-1
Chapter 3: Configuration 3-1
Accessing the EZ Connect Wireless Utility 3-1 Wireless Utility Configuration 3-2
Profile 3-3 Network 3-9 Advanced 3-11 Statistics 3-12 WMM 3-13 WPS 3-14 Radio Setting 3-16 About 3-16 Help 3-17
Chapter 4: Network Planning 4-1
Network Topologies 4-1
Ad Hoc Wireless LAN 4-1 Infrastructure Wireless LAN 4-1
Chapter 5: AP Mode Configuration 5-1
Switching to AP Mode 5-1 AP Mode Utility Configuration 5-2
Configuration 5-3 Access Control 5-6 MAC Table 5-7 Event Log 5-8 Statistics 5-9
vii
Contents
About 5-10 Help 5-11
Appendix A: Troubleshooting A-1
USB Adapter Installation Problems A-1 Network Connection Problems A-1 Uninstalling the Utility A-2
Appendix B: Specifications B-1
viii

Chapter 1: Introduction

The SMCWUSBS-N is a Wi-Fi (IEEE 802.11b/g/n) Wireless USB Adapter that enables wireless connectivity for your PC. The device provides a Wi-Fi client solution for PCs using a USB 2.0 interface. The USB adapter also includes a comprehensive configuration, site survey, and profile management utility that can be installed on a Windows 2000, Windows XP or Windows Vista system.
WPS Button
WPS Indicator
Link/Activity Indicator

Features

• Wi-Fi compliant with IEEE 802.11n (draft 2.0) and IEEEE 802.11b/g standards
• High-speed connection up to 300 Mbps in 802.11n mode
• Dynamic data rate scaling from 1 to 300 Mbps
• Low interference and high susceptibility to guarantee reliable performance
• Support WEP, WPA-PSK, WPA2-PSK security
• Wi-Fi Protected Setup (WPS), including push button and PIN methods
• WMM (Wi-Fi Multimedia)
• Windows 2000, XP and Vista drivers
• WHQL certified
• WLAN site survey and profile management utility
• Infrastructure and Ad-hoc operating modes
1-1
Introduction

System Requirements

Before you install the EZ Connect Wireless USB Adapter, check your system meets the following requirements:
• 2.4 GHz 802.11n (draft 2.0) or 802.11b/g wireless network.
• Microsoft Windows 2000, XP or Vista.
• A Notebook or desktop computer with:
- 300MHz CPU or above.
- Available USB2.0 port
- 20MB of available hard disk space
- CD-ROM drive

Package Checklist

The Wireless USB Adapter package includes these items:
• EZ Connect N Wireless USB 2.0 Adapter (SMCWUSBS-N)
• EZ Installation Wizard & Documentation CD
• Quick Installation Guide.
• Warranty Information Card
Inform your dealer if there are any incorrect, missing or damaged items. If possible, retain the carton, including the original packing materials. Use them to repack the product in case there is a need to return it.

Hardware Description

SMC’s EZ Connect Wireless USB Adapter supports wireless communications at up to 300 Mbps. This adapter operates in the 2.4 GHz band and is fully compliant with IEEE 802.11b/g and 802.11n (draft 2.0). It can be installed in a notebook or desktop PC with a USB port. Support is provided for Windows 2000, Windows XP, and Windows Vista.
1-2

LED Indicators

LED Indicators
The Wireless USB Adapter includes two status LED indicators, as described in the following figure and table.
WPS Authentication
802.11b/g/n Link/Activity
LED Status Description
WPS On/Flashing Green Indicates the WPS button is pressed, and WPS authentication is
Off Indicates WPS authentication is not in progress.
Link/Activity On/Flashing Green Indicates the power is on, and the 802.11b/g/n radio is enabled.
Off Indicates the power is off, or the 802.11b/g/n radio is disabled.
in progress.
Flashing indicates wireless network activity.

WPS Button

Use the WPS button on the Wireless USB Adapter to automatically connect multiple devices to the network. Within two minutes, press the physical or virtual button on wireless client devices to enable them to join the WLAN.
The WPS configuration process may be initiated on any device and there is no restriction to the order in which buttons are pressed.
Any WPS-compatible devices could unintentionally join the WLAN if they are within range during the two-minute set up period after the WPS button is pressed.
For more details about Wi-Fi Protected Setup, please refer to “WPS” on
page 3-14.
1-3
Introduction
1-4
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