ASUS USB-AC51 Adapter User Manual PDF

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Summary of Content for ASUS USB-AC51 Adapter User Manual PDF

User Manual

USB-AC51 Dual-band Wireless-AC600

USB Adapter

Copyright 2013 ASUSTeK Computer Inc. All Rights Reserved. No part of this manual, including the products and software described in it, may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language in any form or by any means, except documentation kept by the purchaser for backup purposes, without the express written permission of ASUSTeK Computer Inc. (ASUS). Product warranty or service will not be extended if: (1) the product is repaired, modified or altered, unless such repair, modification of alteration is authorized in writing by ASUS; or (2) the serial number of the product is defaced or missing. ASUS PROVIDES THIS MANUAL AS IS WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OR CONDITIONS OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL ASUS, ITS DIRECTORS, OFFICERS, EMPLOYEES OR AGENTS BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES (INCLUDING DAMAGES FOR LOSS OF PROFITS, LOSS OF BUSINESS, LOSS OF USE OR DATA, INTERRUPTION OF BUSINESS AND THE LIKE), EVEN IF ASUS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES ARISING FROM ANY DEFECT OR ERROR IN THIS MANUAL OR PRODUCT. SPECIFICATIONS AND INFORMATION CONTAINED IN THIS MANUAL ARE FURNISHED FOR INFORMATIONAL USE ONLY, AND ARE SUBJECT TO CHANGE AT ANY TIME WITHOUT NOTICE, AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY ASUS. ASUS ASSUMES NO RESPONSIBILITY OR LIABILITY FOR ANY ERRORS OR INACCURACIES THAT MAY APPEAR IN THIS MANUAL, INCLUDING THE PRODUCTS AND SOFTWARE DESCRIBED IN IT. Products and corporate names appearing in this manual may or may not be registered trademarks or copyrights of their respective companies, and are used only for identification or explanation and to the owners benefit, without intent to infringe.

E8743 First Edition October 2013

Table of contents

1. Introduction.........................................................................4 Package contents ....................................................................................... 4

System requirements ................................................................................ 4

Status indicator ........................................................................................... 4

2. InstallingtheUSB-AC51driverandutilities.....................5

3. Connectingtoawirelessnetwork......................................8 Connecting to a wireless network using WPS ................................. 9

4. ASUSWLANControlCenter..............................................11 ASUS WLAN Adapter Setting Utility .................................................... 11

Survey ............................................................................................................. 12

Configuration .............................................................................................. 13

Setting up a Preset Wireless Connection ...................................... 14

Setting up Encryption for a Wireless Connection ..................... 15

5. UsingWindowsNetworkManager..................................18

6. Troubleshooting................................................................19

7. Glossary..............................................................................20


1. Introduction

Systemrequirements Before using the USB-AC51 Adapter, check if your system meets the following requirements:

If any of the above items is damaged or missing, contact your retailer immediately.

LED Status Description Link On USB-AC51 has connected to a wireless network successfully.

Off USB-AC51 is not connected.

UsingWi-FiProtectedSetup(forWindowsOSonly) To enable Wi-Fi Protected Setup (WPS), click WPS on the Wireless Utility window and select UsetheWPSbutton.


Windows XP / Vista / 7 / 8 / Mac OSX / Linux 512MB system memory or larger USB 2.0 port Optical disk drive



1. Operating temperature: ambient temperature between 0C ~ 40C

2. Storage temperature: ambient temperature between -10C ~ 70C

3. Humidity: 5% ~ 90% (non-condensing)

ASUS USB-AC51 Adapter x1

Quick Start Guide x1

Support CD x1

Warranty card x1


1. Place the bundled Support CD in the optical drive. An Autorun screen appears if the Autorun function is enabled on your computer.

If the Autorun function is not enabled on your computer, double-click SETUP.EXE from the root directory to run the Support CD.

2. InstallingtheUSB-AC51driverand utilities

2. From the Autorun screen, select your language and click Install ASUSWLANCardUtilities/Driver.

3. An InstallShieldWizard screen appears. Click Next to continue.

Install the driver and utilities from the bundled Support CD before inserting the USB-AC51 into your computer.

4. Select UseASUSWLANUtilities.

5. Select Next to install drivers and utilities to default destination folder.

6. Once prompted, insert the ASUS USB-AC51 Wireless adapter into an available USB port.

7. Click Finish to complete installation.

A message will appear in the Windows notification area indicating that device drivers have successfully been installed.


2. In the WLAN Control Center window, click Survey>Search to search for available wireless networks. Select an Access Point (AP) from the list and click Connect.

1. Right-click the ASUS WLAN Adapter Setting Utility icon in the Windows notification area, then select WirelessSetting.

3. Connectingtoawirelessnetwork

3. If Security is enabled on the AP or station, provide the required password or passkey. Click Save.

4. Setup is complete. Click the Status page on the main window to display network information including signal strength and network traffic.

ConnectingtoawirelessnetworkusingWPS The ASUS USB-AC51 supports Wi-Fi Protected Setup (WPS) for Windows operating systems for securing wireless connections.

ToconnecttheUSB-AC51WirelessadaptertoaWPS-enabledAPusingthe WPSbutton:

Ensure that the AP you are trying to connect to supports the WPS feature.

2. Select UsetheWPSbutton, then click Next.

1. Click WPS on the main utility window.

3. Press the WPS button on the AP or station to establish a secure connection.


4. Click Finish.

1. Select UsePINcode.

2. Key in the APs eight-digit PIN code and click Next.


3. Click Finish.


ASUS WLAN Control Center manages your wireless connections using ASUS USB-AC51.

To launch the ASUS USB-AC51 WLAN Control Center, click Start>AllPrograms >ASUSUtility>USB-AC51WLANCardUtilities>ASUSUSB-AC51WLAN ControlCenter

ASUSWLANAdapterSettingUtility Right-click the ASUS WLAN Adapter Setting Utility icon on the Windows notification area to display the following options:

WirelessSetting- Launches the ASUS WLAN Control Center.

ActiveConfiguration- Disable or enable a preset profile. By default, the profile Auto Roaming is enabled.

Help- Launches the help file.

WPS- Launches the WPS setup window.

AboutControlCenter- Displays the version of your Control Center.

Exit- Closes the ASUS WLAN Control Center.

4. ASUSWLANControlCenter


Left-click the ASUS WLAN Adapter Setting Utility icon to display the following options:

WirelessRadioOn- Turns the wireless radio ON.

WirelessRadioOff- Turns the wireless radio OFF.

Search&Connect- Launches the ASUS WLAN Control Center Survey window and displays available wireless networks.

Survey The Survey window displays a list of available wireless networks and associated network information.

Double-click the icon to launch the ASUS WLAN Control Center.

SSID- Service Set Identifier (SSID) for available wireless networks.

MACAddress- The Media Access Control (MAC) Address is displayed for each detected network device. A MAC address is a unique identifier assigned to networking devices. It consists of six groups of two hexadecimal digits (0 through 9 and A through F) separated by colons, e.g. 00:E0:18:F0:05: C0.


Configuration The Configuration window displays user-defined wireless network connections.

NewConfig-Click this button to create a new preset wireless connection.

Moveup/Movedown-Click to move a preset up / down the list.

Delete-Remove a preset wireless configuration

EditConfig-Edit a preset wireless configuration.

Connect-Establish a connection with a selected wireless network.

Channel- Displays the channel of the wireless network.

CurrentDataRate - Displays the current data transmission rate.

NetworkType - Displays the wireless mode of the network device.

Security - Displays the wireless encryption method for the wireless network.

Search- Instructs the wireless adapter to search for available wireless networks and refresh the list of network devices.




1. Infrastructure - Select Infrastructure to establish a connection with an Access Point or Router.

2. AdHoc- Select Ad Hoc to establish a peer-to-peer connection with another wireless device.

SSID-Assign a wireless network name.

Channel-Select a radio channel for your ASUS WLAN adapter.

In Infrastructure mode, your WLAN adapter automatically selects the correct channel required to communicate with an AP.

In Ad Hoc mode, you are allowed to select a channel for your WLAN adapter. WLAN cards in the same network can communicate with each other if they have the same channel setting.

For the 2.4GHz band, the radio channels you can use depend on the regulations in your country. In the United States (FCC) and Canada (IC), channels 1 to 11 are supported. In Europe (ETSI), channels 1 to 13 are supported. In Japan (MKK), channels 1 to 14 are supported.

For the 5GHz band, the radio channels you can use vary in different regions. Refer to your local regulations for details.

DataRate-TheFully Auto setting adjusts wireless data rate transmission automatically.

Tosetupapresetwirelessconnectionmanually: Click the NewConfig button in the Configuration window. Provide the following information for your wireless network:


Advanced- Default values in the Advanced page are recommended.

Next- Displays the Encryption settings.

Cancel- Cancels preset.

SettingupEncryptionforaWirelessConnection The Encryption page allows you to set up the encryption settings for a wireless connection.

NetworkAuthentication- Select an authentication method from the list:

1. Open- Open System mode disables authentication or uses WEP (Wired Equivalent Privacy) for wireless security.

2. Shared- Shared Key mode uses WEP encryption for your network.

3. WPA-PSK/WPA2-PSK-Wi-Fi Protected Access (WPA) uses a Pre- Shared Key (PSK) for wireless network authentication.

4. WPA/WPA2-Enterprise/WEP802.1X- WPA/WPA2-Enterprise requires a RADIUS server for assigning encryption codes for all wireless devices on the network.


DataEncryption- Encrypts the data before it is transmitted over the network.

In the Open and Shared authentication modes, options are Disabled and WEP.

1. Disabled- Disables the encryption protection for your WLAN adapter.

2. WEP- When you select this option, the cursor appears in the field for Key 1. Key in 10 hexadecimal digits (0~9, a~f, and A~F) for the 64-bit encryption.

In the WPA-PSK/WPA2-PSK and WPA/WPA2-Enterprise/WEP 802.1X authentication modes, availables options are: Temporal Key Integrity Protocol (TKIP) and Advanced Encryption Standard (AES).

1.TKIP- Dynamically generates unique keys to encrypt data packets.

2.AES- Offers stronger protection and increases the complexity of wireless encryption. It is a symmetric 128-bit block encryption method that works simultaneously on multiple network layers.

WirelessNetworkKey- This option becomes available when you select the WPA-Personal authentication mode. Key in 8 to 63 characters in this field.

The characters can also consist of 64 hexadecimal digits.

WirelessNetworkKey(WEP)- This option becomes available when you select WEP in the Data encryption field. 64-bit WEP key uses 5 ASCII characters (10 hexadecimal digits). 128-bit WEP key uses 13 ASCII (26 hexadecimal digits).

1. KeyFormat- Allows you to select the key format.

2.Passphrase- This field generates the WEP keys (Key 1 - Key 4). The passphrase can consists of a sentence, a phrase, or a sequence of alpha-numeric characters .

3. KeyLength- Allows you to select the key length. For 64-bit encryption, each key consists of 10 hexadecimal digits or 5 ASCII characters. For 128-bit encryption, each key consists of 26 hexadecimal digits or 13 ASCII characters.

4. SelectoneasyourDefaultKey- Allows you to select one of the four WEP Keys as the default key.


Advanced - The Advanced page is intended for experienced users to set up additional parameters for the WLAN adapter. Default values are recommended.

1.RTSThreshold(0-2347)- The Request to Send/Clear to Send (RTS/CTS) feature is used to minimize collisions between wireless stations. When RTS/CTS is enabled, the router refrains from sending a data frame until another RTS/CTS handshake is completed. To enable RTS/CTS, set a specific packet size threshold. The default value (2347) is recommended.

2.FragmentationThreshold(256-2346)- Fragmentation is used to divide 802.11 frames into smaller pieces (fragments) that are sent separately to the destination. To enable fragmentation, set a specific packet size threshold. If there is an excessive number of collisions on the WLAN, experiment with different fragmentation values to increase the reliability of frame transmissions. The default value (2346) is recommended for normal use.

3.PreambleMode- Select the preamble mode as Auto (default), Long or Short.


1. Right-click the ASUS WLAN Adapter Setting Utility icon on the Windows notification area.

2. Click Exit.


5. UsingWindowsNetworkManager

3. Click the Windows Network icon on the Windows notification area.


6. Troubleshooting This chapter provides solutions to problems which you may encounter when installing or using ASUS USB-AC51. Contact a qualified service technician for assistance if the problem still persists after you have performed the troubleshooting solutions.

HowdoIverifythatmyWLANadapterisinstalledproperly? 1. Right-click MyComputer from the Start menu, then select Properties.

2. Select the Hardware tab, then click DeviceManager.

3. Double-click Networkadapters.

4. Double-click ASUSUSB-AC51USBWirelessAdapter. An ASUSUSB- AC51USBWirelessAdapter window appears.

5. Check Devicestatus to see if the WLAN adapter is working properly.

MyWLANadaptercannotconnecttoanyAccessPoint. Check if NetworkType is set to Infrastructure mode.

Check if the SSID of your WLAN adapter is the same as that of the Access Point you want to connect to.

Check if the Encryption settings of your WLAN adapter are the same as the Access Point you want to connect to.

MyWLANadaptercannotconnecttoastationorWLAN adapter.

Check if NetworkType is set to AdHoc mode.

Check if the SSID of your WLAN adapter is the same as that of the station or the WLAN adapter you want to connect to.

Check if the Channel of your WLAN adapter is the same as that of the station or the WLAN adapter you want to connect to.

Check if the Encryption settings of your WLAN adapter are the same as those of the station or the WLAN adapter you want to connect to.

Theconnectionqualityisbadandthesignalstrengthisweak. Keep your WLAN adapter away from microwave ovens and large metal

objects to avoid radio interference.

Move your WLAN adapter closer to the access point, station, or WLAN adapter you want to connect to.


7. Glossary AccessPoint(AP) A networking device that seamlessly connects wired and wireless networks. Access Points combined with a distributed system support the creation of multiple radio cells that enable roaming throughout a facility.

AdHoc A wireless network composed solely of stations within mutual communication range of each other (no Access Point).

BasicRateSet This option allows you to specify the data transmission rate.

BasicServiceArea(BSS) A set of stations controlled by a single coordination function.

Broadband A type of data transmission in which a single medium (such as cable) carries several data at once.

Channel An instance of medium use for the purpose of passing protocol data units that may be used simultaneously, in the same volume of space, with other instances of medium use (on other channels) by other instances of the same physical layer, with an acceptably low frame error ratio due to mutual interference.

Client A client is the desktop or mobile PC that is connected to your network.


COFDM(for802.11aor802.11g) Signal power alone is not enough to maintain 802.11b-like distances in an 802.11a/g environment. To compensate, a new physical-layer encoding technology was designed that departs from the traditional direct-sequence technology being deployed today. This technology is called COFDM (coded OFDM). COFDM was developed specifically for indoor wireless use and offers performance much superior to that of spread-spectrum solutions. COFDM works by breaking one high-speed data carrier into several lowerspeed subcarriers, which are then transmitted in parallel. Each high-speed carrier is 20MHz wide and is broken up into 52 subchannels, each approximately 300KHz wide. COFDM uses 48 of these subchannels for data, while the remaining four are used for error correction. COFDM delivers higher data rates and a high degree of multipath reflection recovery, thanks to its encoding scheme and error correction. Each subchannel in the COFDM implementation is about 300KHz wide. At the low end of the speed gradient, BPSK (binary phase shift keying) is used to encode 125Kbps of data per channel, resulting in a 6,000Kbps, or 6Mbps, data rate. Using quadrature phase shift keying, you can double the amount of data encoded to 250Kbps per channel, yielding a 12Mbps data rate. And by using 16-level quadrature amplitude modulation encoding 4bits per hertz, you can achieve a data rate of 24Mbps. The 802.11a/g standard specifies that all 802.11a/g-compliant products must support these basic data rates. The standard also lets the vendor extend the modulation scheme beyond 24Mbps. Remember, the more bits per cycle (hertz) that are encoded, the more susceptible the signal will be to interference and fading, and ultimately, the shorter the range, unless power output is increased.

DefaultKey This option allows you to select the default WEP key. This option allows you to use WEP keys without having to remember or write them down. The WEP keys generated using the Pass Phrase is compatible with other WLAN products. The Pass Phrase option is not as secure as manual assignment.

DeviceName Also known as DHCP client ID or network name. Sometimes provided by an ISP when using DHCP to assign addresses.

DHCP(DynamicHostConfigurationProtocol) This protocol allows a computer (or many computers on your network) to be automatically assigned a single IP address from a DHCP server.


DNSServerAddress(DomainNameSystem) DNS allows Internet host computers to have a domain name and one or more IP addresses. A DNS server keeps a database of host computers and their respective domain names and IP addresses, so that when a user enters a domain name into the Internet browser, the user is sent to the proper IP address. The DNS server address used by the computers on your home network is the location of the DNS server your ISP has assigned.

DSLModem(DigitalSubscriberLine) A DSL modem uses your existing phone lines to transmit data at high speeds.

Direct-SequenceSpreadSpectrum(for802.11b) Spread spectrum (broadband) uses a narrowband signal to spread the transmission over a segment of the radio frequency band or spectrum. Direct- sequence is a spread spectrum technique where the transmitted signal is spread over a particular frequency range. Direct-sequence systems communicate by continuously transmitting a redundant pattern of bits called a chipping sequence. Each bit of transmitted data is mapped into chips and rearranged into a pseudorandom spreading code to form the chipping sequence. The chipping sequence is combined with a transmitted data stream to produce the output signal. Wireless mobile clients receiving a direct-sequence transmission use the spreading code to map the chips within the chipping sequence back into bits to recreate the original data transmitted by the wireless device. Intercepting and decoding a direct-sequence transmission requires a predefined algorithm to associate the spreading code used by the transmitting wireless device to the receiving wireless mobile client. This algorithm is established by IEEE 802.11b specifications. The bit redundancy within the chipping sequence enables the receiving wireless mobile client to recreate the original data pattern, even if bits in the chipping sequence are corrupted by interference. The ratio of chips per bit is called the spreading ratio. A high spreading ratio increases the resistance of the signal to interference. A low spreading ratio increases the bandwidth available to the user. The wireless device uses a constant chip rate of 11Mchips/s for all data rates, but uses different modulation schemes to encode more bits per chip at the higher data rates. The wireless device is capable of an 11 Mbps data transmission rate, but the coverage area is less than a 1 or 2 Mbps wireless device since coverage area decreases as bandwidth increases.


Encryption This provides wireless data transmissions with a level of security. This option allows you to specify a 64-bit or a 128-bit WEP key. A 64-bit encryption contains 10 hexadecimal digits or 5 ASCII characters. A 128-bit encryption contains 26 hexadecimal digits or 13 ASCII characters. 64-bit and 40-bit WEP keys use the same encryption method and can interoperate on wireless networks. This lower level of WEP encryption uses a 40-bit (10 hexadecimal digits assigned by the user) secret key and a 24-bit Initialization Vector assigned by the device. 104-bit and 128-bit WEP keys use the same encryption method. All wireless clients in a network must have identical WEP keys with the access point to establish connection. Keep a record of the WEP encryption keys.

ExtendedServiceSet(ESS) A set of one or more interconnected basic service set (BSSs) and integrated local area networks (LANs) can be configured as an Extended Service Set.

ESSID(ExtendedServiceSetIdentifier) You must have the same ESSID entered into the gateway and each of its wireless clients. The ESSID is a unique identifier for your wireless network.

Ethernet The most widely used LAN access method, which is defined by the IEEE 802.3 standard. Ethernet is normally a shared media LAN meaning all devices on the network segment share total bandwidth. Ethernet networks operate at 10Mbps using CSMA/CD to run over 10-BaseT cables.

Firewall A firewall determines which information passes in and out of a network. NAT can create a natural firewall by hiding a local networks IP addresses from the Internet. A Firewall prevents anyone outside of your network from accessing your computer and possibly damaging or viewing your files.

Gateway A network point that manages all the data traffic of your network, as well as to the Internet and connects one network to another.

ICS ICS is used to share one computers Internet connection with the rest of the computers on your network. When this computer is connected to the Internet, all the communications to and from the Internet on your network are sent through this computer which is called the host computer. The rest of the computers can send and receive e-mail messages and access the web as if it were connected directly to the Internet.


IEEE The Institute of Electrical and Electronics Engineers. The IEEE sets standards for networking, including Ethernet LANs. IEEE standards ensure interoperability between systems of the same type.

IEEE802.11 IEEE 802.xx is a set of specifications for LANs from the Institute of Electrical and Electronic Engineers (IEEE). Most wired networks conform to 802.3, the specification for CSMA/CD based Ethernet networks or 802.5, the specification for token ring networks. 802.11 defines the standard for wireless LANs encompassing three incompatible (non-interoperable) technologies: Frequency Hopping Spread Spectrum (FHSS), Direct Sequence Spread Spectrum (DSSS), and Infrared. 802.11 specifies a carrier sense media access control and physical layer specifications for 1 and 2 Mbps wireless LANs.

IEEE802.11a(54Mbits/sec) Compared with 802.11b: The 802.11b standard was designed to operate in the 2.4GHz ISM (Industrial, Scientific and Medical) band using direct-sequence spreadspectrum technology. The 802.11a standard, on the other hand, was designed to operate in the more recently allocated 5-GHz UNII (Unlicensed National Information Infrastructure) band. And unlike 802.11b, the 802.11a standard departs from the traditional spread-spectrum technology, instead using a frequency division multiplexing scheme thats intended to be friendlier to office environments. The 802.11a standard, which supports data rates of up to 54 Mbps, is the Fast Ethernet analog to 802.11b, which supports data rates of up to 11 Mbps. Like Ethernet and Fast Ethernet, 802.11b and 802.11a use an identical MAC (Media Access Control). However, while Fast Ethernet uses the same physical-layer encoding scheme as Ethernet (only faster), 802.11a uses an entirely different encoding scheme, called OFDM (orthogonal frequency division multiplexing). The 802.11b spectrum is plagued by saturation from wireless phones, microwave ovens and other emerging wireless technologies, such as Bluetooth. In contrast, 802.11a spectrum is relatively free of interference. The 802.11a standard gains some of its performance from the higher frequencies at which it operates. The laws of information theory tie frequency, radiated power and distance together in an inverse relationship. Thus, moving up to the 5GHz spectrum from 2.4GHz will lead to shorter distances, given the same radiated power and encoding scheme.


Comparedwith802.11g 802.11a is a standard for access points and radio NICs that is ahead of 802.11g in the market by about six months. 802.11a operates in the 5GHz frequency band with twelve separate non-overlapping channels. As a result, you can have up to twelve access points set to different channels in the same area without them interfering with each other. This makes access point channel assignment much easier and significantly increases the throughput the wireless LAN can deliver within a given area. In addition, RF interference is much less likely because of the less-crowded 5GHz band.

IEEE802.11b(11Mbits/sec) In 1997, the Institute of Electrical and Electronics Engineers (IEEE) adopted the 802.11 standard for wireless devices operating in the 2.4 GHz frequency band. This standard includes provisions for three radio technologies: direct sequence spread spectrum, frequency hopping spread spectrum, and infrared. Devices that comply with the 802.11 standard operate at a data rate of either 1 or 2 Mbps. In 1999, the IEEE created the 802.11b standard. 802.11b is essentially identical to the 802.11 standard except 802.11b provides for data rates of up to 11Mbps for direct sequence spread spectrum devices. Under 802.11b, direct sequence devices can operate at 11Mbps, 5.5Mbps, 2Mbps, or 1Mbps. This provides interoperability with existing 802.11 direct sequence devices that operate only at 2Mbps. Direct sequence spread spectrum devices spread a radio signal over a range of frequencies. The IEEE 802.11b specification allocates the 2.4GHz frequency band into 14 overlapping operating Channels. Each Channel corresponds to a different set of frequencies.

IEEE802.11g 802.11g is a new extension to 802.11b (used in majority of wireless LANs today) that broadens 802.11bs data rates to 54 Mbps within the 2.4 GHz band using OFDM (orthogonal frequency division multiplexing) technology. 802.11g allows backward compatibility with 802.11b devices but only at 11 Mbps or lower, depending on the range and presence of obstructions.

Infrastructure A wireless network centered about an access point. In this environment, the access point not only provides communication with the wired network but also mediates wireless network traffic in the immediate neighborhood.


IP(InternetProtocol) The TCP/IP standard protocol that defines the IP datagram as the unit of information passed across an Internet and provides the basis for connectionless packet delivery service. IP includes the ICMP control and error message protocol as an integral part. It provides the functional equivalent of ISO OSI Network Services.

IPAddress An IP address is a 32-bit number that identifies each sender or receiver of information that is sent across the Internet. An IP address has two parts: the identifier of a particular network on the Internet and an identifier of the particular device (which can be a server or a workstation) within that network.

ISMBands(Industrial,Scientific,andMedicineBands) Radio frequency bands that the Federal Communications Commission (FCC) authorized for wireless LANs. The ISM bands are located at 902MHz, 2.400GHz, and 5.7GHz.

ISP(InternetServiceProvider) An organization that provides access to the Internet. Small ISPs provide service via modem and ISDN while the larger ones also offer private line hookups (T1, fractional T1, etc.).

LAN(LocalAreaNetwork) A communications network that serves users within a defined geographical area. The benefits include the sharing of Internet access, files and equipment like printers and storage devices. Special network cabling (10 Base-T) is often used to connect the PCs together.

MACAddress(MediaAccessControl) A MAC address is the hardware address of a device connected to a network.

NAT(NetworkAddressTranslation) NAT masks a local networks group of IP addresses from the external network, allowing a local network of computers to share a single ISP account. This process allows all of the computers on your home network to use one IP address. This will enable access to the Internet from any computer on your home network without having to purchase more IP addresses from your ISP.


NIC(NetworkInterfaceCard) A network adapter inserted into a computer so that the computer can be connected to a network. It is responsible for converting data from stored in the computer to the form transmitted or received.

Packet A basic message unit for communication across a network. A packet usually includes routing information, data, and sometimes error detection information.

PassPhrase The Wireless Settings utility uses an algorithm to generate four WEP keys based on the typed combination.

PCMCIA(PersonalComputerMemoryCardInternational Association) The Personal Computer Memory Card International Association (PCMCIA), develops standards for PC cards, formerly known as PCMCIA cards. These cards are available in three types, and are about the same length and width as credit cards. However, the different width of the cards ranges in thickness from 3.3 mm (Type I) to 5.0 mm (Type II) to 10.5 mm (Type III). These cards can be used for various functions, including memory storage, land line modems and wireless modems.

PPP(Point-to-PointProtocol) PPP is a protocol for communication between computers using a serial interface, typically a personal computer connected by phone line to a server. PPPoE (Point-to-Point Protocol over Ethernet) Point-to-Point Protocol is a method of secure data transmission. PPP using Ethernet to connect to an ISP.

Preamble Allows you to set the preamble mode for a network to Long, Short, or Auto. The default preamble mode is Long.

RadioFrequency(RF)Terms:GHz,MHz,Hz The international unit for measuring frequency is Hertz (Hz), equivalent to the older unit of cycles per second. One megahertz (MHz) is one million Hertz. One gigahertz (GHz) is one billion Hertz. The standard US electrical power frequency is 60Hz, the AM broadcast radio frequency band is 0.55-1.6MHz, the FM broadcast radio frequency band is 88-108MHz, and wireless 802.11 LANs operate at 2.4GHz.


SSID(ServiceSetIdentifier) SSID is a group name shared by every member of a wireless network. Only client PCs with the same SSID are allowed to establish a connection. Enabling the ResponsetoBroadcastSSIDrequests option allows the device to broadcast its SSID in a wireless network. This allows other wireless devices to scan and establish communication with the device. Unchecking this option hides the SSID to prevent other wireless devices from recognizing and connecting to the device.

Station Any device containing IEEE 802.11 wireless medium access conformity.

SubnetMask A subnet mask is a set of four numbers configured like an IP address. It is used to create IP address numbers used only within a particular network.

TCP(TransmissionControlProtocol) The standard transport level protocol that provides the full duplex, stream service on which many application protocols depend. TCP allows a process or one machine to send a stream of data to a process on another. Software implementing TCP usually resides in the operating system and uses the IP to transmit information across the network.

WAN(WideAreaNetwork) A system of LANs, connected together. A network that connects computers located in separate areas, (i.e., different buildings, cities, countries). The Internet is a wide area network.

WECA(WirelessEthernetCompatibilityAlliance) An industry group that certifies cross-vender interoperability and compatibility of IEEE 802.11b wireless networking prod WPA (Wi-Fi Protected Access)

WPA(Wi-FiProtectedAccess) Wi-Fi Protected Access (WPA) is an improved security system for 802.11. It is part of the 802.11i draft security standard. WPA encompasses TKIP (Temporal Key Integrity Protocol) along with MIC (Message Integrity Check) and other fixes to WEP such as Weak IV (Initialization Vector) filtering and Random IV generation. TKIP uses 802.1x to deploy and change temporary keys as opposed to static WEP keys once used in the past. It is a significant improvement over WEP. WPA is part of a complete security solution. WPA also requires authentication servers in enterprise security solutions.


Requirements (1) A WPA compatible Access Point or Wireless router, (2) Operating system updates that support WPA. In XP, an updated Windows Zero Config service is needed. Users can download the Windows XP WPA patch here: ABEC-274845DC9E91&displaylang=en Please note that this patch requires the installation Windows XP Service Pack 1, which is available here: downloads/servicepacks/sp1/default.asp For earlier Windows Operating systems, a WPA capable supplicant is required such as Funk Softwares Odyssey Client.

WLAN(WirelessLocalAreaNetwork) This is a group of computers and other devices connected wirelessly in a small area. A wireless network is referred to as LAN or WLAN.


WARNING: Any changes or modifications not expressly approved by the party responsible for compliance could void the users authority to operate the equipment.

Notices FederalCommunicationsCommission This device complies with FCC Rules Part 15. Operation is subject to the following two conditions: This device may not cause harmful interference, and

This device must accept any interference received, including interference that may cause undesired operation.

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 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.

ProhibitionofCo-location This device and its antenna(s) must not be co-located or operating in conjunction with any other antenna or transmitter.

Operate the device in 5150-5250MHz frequency band for indoor use only.


FCCRadiationExposureStatement This equipment complies with RFCC radiation exposure limits set forth for an uncontrolled environment . This equipment should be installed and operated with minimum 20cm between the radiator and your body.

CEMarkWarning This is a Class B product, in a domestic environment, this product may cause radio interference, in which case the user may be required to take adequate measures. Operation Channels: Ch1~11 for N. America, Ch1~14 Japan, Ch1~ 13 Europe (ETSI)


Article12 Without permission, any company, firm or user shall not alter the frequency, increase the power, or change the characteristics and functions of the original design of the certified lower power frequency electric machinery.

Article 14 The application of low power frequency electric machineries shall not affect the navigation safety nor interfere a legal communication, if an interference is found, the service will be suspended until improvement is made and the interference no longer exists.




This Class [B] digital apparatus complies with Canadian ICES-003. Cet appareil numrique de la classe [B] est conforme la norme NMB-003 du Canada. For product available in the USA/Canada market, only channel 1~11 can be operated. Selection of other channels is not possible.

ICRadiationExposureStatement: This equipment complies with IC RSS-102 radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator & your body. Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device.

ICWarningStatement Under Industry Canada regulations, this radio transmitter may only operate using an antenna of a type and maximum (or lesser) gain approved for the transmitter by Industry Canada. To reduce potential radio interference to other users, the antenna type and its gain should be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that necessary for successful communication.

This radio transmitter(IC: 3568A-USBAC51) has been approved by Industry Canada to operate with the antenna types listed below with the maximum permissible gain and required antenna impedance for each antenna type indicated. Antenna types not included in this list, having a gain greater than the maximum gain indicated for that type, are strictly prohibited for use with this device.


Canada,avisdIndustryCanada(IC) Cet appareil numrique de classe B est conforme aux normes canadiennes ICES-003 et RSS-210. Son fonctionnement est soumis aux deux conditions suivantes : (1) cet appareil ne doit pas causer dinterfrence et (2) cet appareil doit accepter toute interfrence, notamment les interfrences qui peuvent affecter son fonctionnement. Informationsconcernantlexpositionauxfrquencesradio(RF) La puissance de sortie mise par lappareil de sans fil Dell est infrieure la limite dexposition aux frquences radio dIndustry Canada (IC). Utilisez lappareil de sans fil Dell de faon minimiser les contacts humains lors du fonctionnement normal.

Ce priphrique a t valu et dmontr conforme aux limites SAR (Specific Absorption Rate Taux dabsorption spcifique) dIC lorsquil est install dans des produits htes particuliers qui fonctionnent dans des conditions dexposition des appareils portables (les antennes se situent moins de 20 centimtres du corps dune personne). Ce priphrique est homologu pour lutilisation au Canada. Pour consulter lentre correspondant lappareil dans la liste dquipement radio (REL - Radio Equipment List) dIndustry Canada rendez-vous sur: Pour des informations supplmentaires concernant lexposition aux RF au Canada rendezvous sur : html

ASUSRecycling/TakebackServices ASUS recycling and takeback programs come from our commitment to the highest standards for protecting our environment. We believe in providing solutions for you to be able to responsibly recycle our products, batteries, other components as well as the packaging materials. Please go to http://csr.asus. com/english/Takeback.htm for the detailed recycling information in different regions.

REACH Complying with the REACH (Registration, Evaluation, Authorisation, and Restriction of Chemicals) regulatory framework, we published the chemical substances in our products at ASUS REACH website at english/REACH.htm.



ASUSTeK COMPUTER INC. (Asia Pacific) Address 1 Li-Te Road, Peitou, Taipei, Taiwan 112 Website

Technical Support Telephone +223 Support Fax +220 Online support

ASUS COMPUTER INTERNATIONAL (America) Address 00 Corporate Way, Fremont, CA 3, USA Telephone +10203 Fax +1023313 Website Online support

ASUS COMPUTER GmbH (Germany and Austria) Address Harkort Str. 21-23, D-00 Ratingen,

Germany Fax +210211 Website Online contact

Technical Support Telephone (Component) +491805010923* Telephone (System/Notebook/Eee/LCD) +491805010920* Fax +210211 Online support

* EUR 0.14/minute from a German fixed landline; EUR 0.42/minute from a mobile phone.


EEE Ynetmeliine Uygundur.

Manufacturer ASUSTeKComputerInc. Tel: +886-2-2894-3447 Address: 4F., No. 150, LI-TE RD., PEITOU, TAIPEI 112, TAIWAN

Authorised representative inEurope

ASUSComputerGmbH Address: HARKORT STR. 21-23, 40880 RATINGEN, GERMANY

Authorised distributorsin Turkey


Manualsnet FAQs

If you want to find out how the USB-AC51 ASUS works, you can view and download the ASUS USB-AC51 Adapter User Manual on the Manualsnet website.

Yes, we have the User Manual for ASUS USB-AC51 as well as other ASUS manuals. All you need to do is to use our search bar and find the user manual that you are looking for.

The User Manual should include all the details that are needed to use a ASUS USB-AC51. Full manuals and user guide PDFs can be downloaded from

The best way to navigate the ASUS USB-AC51 Adapter User Manual is by checking the Table of Contents at the top of the page where available. This allows you to navigate a manual by jumping to the section you are looking for.

This ASUS USB-AC51 Adapter User Manual consists of sections like Table of Contents, to name a few. For easier navigation, use the Table of Contents in the upper left corner.

You can download ASUS USB-AC51 Adapter User Manual free of charge simply by clicking the “download” button in the upper right corner of any manuals page. This feature allows you to download any manual in a couple of seconds and is generally in PDF format. You can also save a manual for later by adding it to your saved documents in the user profile.

To be able to print ASUS USB-AC51 Adapter User Manual, simply download the document to your computer. Once downloaded, open the PDF file and print the ASUS USB-AC51 Adapter User Manual as you would any other document. This can usually be achieved by clicking on “File” and then “Print” from the menu bar.