D-Link | DWA-121 | Specifications | D-Link DWA-121 Specifications

Table of Contents
Table of Contents
Product Overview.......................................................................3
Package Contents............................................................................................ 3
System Requirements..................................................................................... 3
Introduction....................................................................................................... 4
Features............................................................................................................... 5
Hardware Overview......................................................................................... 6
Installation...................................................................................7
Getting Started................................................................................................. 7
Remove Existing Installations............................................................. 7
Disable Other Wireless Adapters....................................................... 8
Wireless Installation Considerations.......................................................10
Adapter Installation.......................................................................................11
Wi-Fi® Protected Setup (WPS)............................................................17
Configuration........................................................................... 20
D-Link Wireless Connection Manager....................................................20
Wireless Networks.................................................................................21
My Wireless Networks..........................................................................25
Add Profile........................................................................................26
Modify Profile..................................................................................27
Support.....................................................................................................28
About.........................................................................................................29
Connect to a Wireless Network............................................. 30
Using Windows® 7...........................................................................................30
Using Windows® XP........................................................................................32
Wireless Security...................................................................... 33
What is WPA?....................................................................................................33
Configure WPA/WPA2 Passphrase............................................................34
Using the D-Link Wireless Connection Manager.......................34
Using Windows® 7..................................................................................36
Using Windows Vista®..........................................................................39
Using the Windows® XP Utility..........................................................41
Configure WPA/WPA2 (RADIUS)................................................................43
Using the D-Link Wireless Connection Manager.......................43
Troubleshooting...................................................................... 44
Windows® 7 Troubleshooting.....................................................................48
Wireless Basics......................................................................... 50
Wireless Modes...............................................................................................54
Networking Basics................................................................... 55
Check your IP address...................................................................................55
Windows® XP/2000 Users....................................................................55
Windows 7/Vista® Users.......................................................................55
Statically Assign an IP address...................................................................56
Windows® XP/2000 Users....................................................................56
Windows 7/Vista® Users.......................................................................57
Technical Specifications......................................................... 58
Connect to a Wireless Network............................................. 31
Using Windows Vista®. ..................................................................................31
D-Link DWA-121 User Manual
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Section 1 - Product Overview
Product
PackageOverview
Contents
D-Link DWA-121 Wireless N 150 Micro USB Adapter
Manual and Software on CD
Quick Installation Guide
System Requirements
• A computer or laptop with an available USB 2.0 port
• Windows® 7, Vista®, XP (Service Pack 2)
• CD-ROM Drive
• 300MHz processor and at least 64MB of RAM
• A 802.11n or 802.11g access point or wireless router
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Section 1 - Product Overview
Introduction
The DWA-121 Wireless N 150 Micro USB Adapter is a convenient wireless connectivity solution for desktop or notebook PCs. Instead of stringing
Ethernet cables to your PC or dismantling your desktop computer case, the DWA-121 can enable 802.11n wireless connectivity by simply utilizing
your desktop or notebook PC’s USB port.
Powered by Wireless N 150 technology, the DWA-121 provides a faster wireless connection and superior reception than 802.11g*. The DWA-121 is
designed for use in bigger homes and for those that demand higher bandwidth networking. Maximize wireless performance by connecting this
USB Adapter to a Wireless N™ router and stay connected from virtually anywhere in the home. This USB Adapter supports WPA and WPA2 encryption
to prevent outside intrusion and protect your personal information from being exposed.
D-Link’s Quick Setup Wizard guides you step-by-step through the installation process. You’ll be able to configure this USB Adapter without having
any difficulties. The D-Link Wireless Manager is included with this product to keep track of all your most frequently accessed networks.
Compact in size, robust in speed the DWA-121 Wireless N 150 Micro USB Adapter is great for travel and a convenient solution for providing high
performance wireless connectivity to your desktop or notebook PC. Enjoy the many benefits of wireless connectivity today!
* Maximum wireless signal rate derived from IEEE Standard 802.11g and 802.11n specifications. Actual data throughput will vary. Network conditions and
environmental factors, including volume of network traf0fic, building materials and construction, and network overhead, lower actual data throughput rate.
Environmental conditions will adversely affect wireless signal range.
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Section 1 - Product Overview
Features
• Compact size for placement anywhere
• Convenience of Plug & Play installation
• Fully 802.11g compatible
• 802.11n compliant
• Powered by the USB port; no external power source required
• USB 2.0 standard*
• You can securely connect to a wireless network using WPA/WPA2 (Wi-Fi Protected Access) providing you a much higher level of
security for your data and communication than has previously been available.
• Position the DWA-121 almost anywhere in your workspace to achieve the best reception possible
• Supports Infrastructure networks via an access point
• User-friendly configuration and diagnostic utilities
* Using a USB 1.1 port will adversely affect throughput.
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Section 1 - Product Overview
Hardware Overview
1
1
USB Connector
D-Link DWA-121 User Manual
Used to connect the DWA-121 to your computer.
6
Section 2 - Installation
Installation
This section will walk you through the installation process. If you have a built-in wireless adapter, please disable it in device manager before installing
your D-Link adapter. Also, if you have previously installed another wireless adapter, please make sure any software is uninstalled.
Getting Started
Before installing your new D-Link wireless adapter, please verify the following:
• Remove any previous installations of wireless adapters
• Disable any built-in wireless adapters
• Verify the settings such as the SSID and security settings of the network(s) you want to connect to
Remove Existing Installations
If you’ve installed a different manufacture’s adapter or a different model D-Link adapter, make sure the software is uninstalled before installing
the new software. Some utilities may cause a conflict with the new software. If you plan to use multiple adapters at different times, make sure the
utilities are not set to load when your computer boots up. Windows® 7, Vista® and XP users may use the built-in wireless utility for all adapters.
To remove any old software:
Windows 7 users: Click Start > Control Panel > Uninstall Programs.
Windows Vista/XP users: Click Start > Control Panel > Add or Remove Programs.
Windows 2000 users: Click Start > Settings > Control Panel > Add or Remove Programs.
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Section 2 - Installation
Disable Other Wireless Adapters
Most newer laptops may include a built-in wireless adapter. To prevent any conflicts with the D-Link wireless adapter, it is recommended to disable
the wireless adapter (as well as any unused Ethernet adapters).
From the desktop, right-click on the My Computer icon and select Manage.
Then, click Device Manager. Scroll down the list and click the + sign to the left of Network Adapters.
Right-click the adapter you would like to disable and select Disable.
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Section 2 - Installation
Click Yes to disable the adapter.
The adapter is now disabled. When disabled, a red X will be displayed.
Disabling the adapter will not remove the drivers. If you would like to use the
adapter, simply right-click it and select Enable.
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Section 2 - Installation
Wireless Installation Considerations
The D-Link wireless adapter lets you access your network using a wireless connection from virtually anywhere within the operating range of your
wireless network. Keep in mind that the number, thickness and location of walls, ceilings, or other objects that the wireless signals must pass
through, may limit the range. Typical ranges vary depending on the types of materials and background RF (radio frequency) noise in your home or
business. The key to maximizing wireless range is to follow these basic guidelines:
1. Keep the number of walls and ceilings between the D-Link adapter and other network devices to a minimum - each wall or ceiling
can reduce your adapter’s range from 3-90 feet (1-30 meters.) Position your devices so that the number of walls or ceilings is
minimized.
2. Be aware of the direct line between network devices. A wall that is 1.5 feet thick (.5 meters), at a 45-degree angle appears to be
almost 3 feet (1 meter) thick. At a 2-degree angle it looks over 42 feet (14 meters) thick! Position devices so that the signal will
travel straight through a wall or ceiling (instead of at an angle) for better reception.
3. Building Materials make a difference. A solid metal door or aluminum studs may have a negative effect on range. Try to position
access points, wireless routers, and computers so that the signal passes through drywall or open doorways. Materials and objects
such as glass, steel, metal, walls with insulation, water (fish tanks), mirrors, file cabinets, brick, and concrete will degrade your
wireless signal.
4. Keep your product away (at least 3-6 feet or 1-2 meters) from electrical devices or appliances that generate RF noise.
5. If you are using 2.4GHz cordless phones or X-10 (wireless products such as ceiling fans, lights, and home security systems), your
wireless connection may degrade dramatically or drop completely. Make sure your 2.4GHz phone base is as far away from your
wireless devices as possible. The base transmits a signal even if the phone in not in use.
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Section 2 - Installation
Adapter Installation
Warning: Do NOT install the DWA-121 Wireless N 150 Micro USB Adapter into your computer before installing the driver software from the
D-Link CD.
Turn on the computer and Insert the D-Link DWA-121 Driver CD in the CD-ROM drive.
If the CD Autorun function does not automatically start on your computer, go to Start > Run. In the run box type “D:\Autorun.exe” (where D:
represents the drive letter of your CD-ROM drive).
When the autorun screen appears, click Install Drivers.
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Section 2 - Installation
Please select your language from the list and click Next to continue.
The InstallShield Wizard window will appear.
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Section 2 - Installation
Select the new folder or an existing folder that you would like the insatallation
Wizard to add program icons to and then click Next.
Insert the adapter into an available USB port on your computer.
If the Found New Hardware Wizard appears, click Cancel.
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Section 2 - Installation
Please wait while the installation wizard configures your new software installation.
To manually connect to your wireless network, select Manually connect to a
wireless network and then click Next.
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Section 2 - Installation
To manually connect to your wireless network, select Manually connect to a
wireless network and then click Next.
Enter the network name (SSID) manually. If you enter the SSID incorrectly, you
will be directed to the site survey page. Click Scan to display the site survey page
or click Next to continue.
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Section 2 - Installation
Click the Scan button to display a list of wireless networks (site survey). Click on
the network name (SSID) and click Next.
Click Finish to continue. If you are prompted to reboot your computer, select
Yes, I want to restart my computer now.
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Section 2 - Installation
Wi-Fi® Protected Setup (WPS)
Wi-Fi Protected Setup (WPS) System is designed for easy setup of security-enabled
Wi-Fi networks. It is recommended to have the access point or wireless router
nearby during setup.
For more information on WPS, visit the Wi-Fi Alliance website at www.wi-fi.org.
To begin the WPS setup, select the option the Use the WiFi Protected Setup (WPS)
wizard for simplified Wireless connection and click Next.
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Section 2 - Installation
Press the WPS button located on the right side of the Router/ Access point until it
is lit and click on the virtual Connect Now button.
Please wait while the Router/ Access point establishes connection.
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Section 2 - Installation
When this screen appears, you have successfully established connectivity. Click
Finish to complete your setup.
Press the WPS button located on the right side of the Router/Access point until
it is lit and click on the virtual Connect Now button.
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Section 3 - Configuration
Configuration
This section will show you how to configure your new D-Link wireless adapter using the D-Link Utility as well as the Windows® XP Zero Configuration
Utility and Vista WLAN Autoconfiguration.
D-Link Wireless Connection Manager
The D-Link DWA-121 uses the Wireless Connection Manager as the management software. The manager provides the user an easy interface to
change any settings related to the wireless adapter. Clicking on the Wireless Connection Manager icon on the desktop will start the Configuration.
If you are using Windows® 7, Vista®, or XP, please skip to pages 30, 31 or 32 respectively.
Double-click the Wireless Connection Manager icon on your
desktop.
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Section 3 - Configuration
Wireless Networks
The Wireless Networks (Site Survey) page will display all wireless networks that are available in your area. To connect to a network, simply highlight
the wireless network (SSID) and click Connect.
SSID: The SSID (Service Set Identifier) is the name of the wireless
network.
MAC: Displays the MAC address of the wireless device.
Signal: Displays the Link Quality of the wireless connection.
Security: If there is a “lock” icon, this means the wireless network is
secure. You must know the encryption key/security settings
to connect.
Channel: Displays the channel of the wireless network.
WPS Button: Connect to a wireless network using Wi-Fi Protected Setup.
Refer to the next page.
Refresh Button: Rescans for available wireless networks in your area.
Connect Button: Highlight a wireless network and click the Connect button. If
the network is secure, a pop-up window will appear. Enter the
security information to connect (refer to the Wireless Security
section for more information).
Activate Button: Select a wireless network profile from the drop-down menu
and click Activate to connect. Allow up to 30 seconds to
connect.
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Section 3 - Configuration
Personal Identification Number (PIN)
To use the PIN method, select PIN (Personal Identification Number) and click Next.
Make sure your access point or wireless router is close by. Write down the number
on the screen. Enter this number in your access point or wireless router. Please
refer to the manufacture’s manual for instructions.
Once you click Next, you will have two minutes to enter this number in your
access point or wireless router.
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Section 3 - Configuration
The adapter will try to establish connectivity to your access point or wireless
router.
When this screen appears, you have successfully established connectivity. Click
Finish to complete your setup.
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Section 3 - Configuration
Press the WPS button located on the right side of the Router/Access point until
it is lit and click on the virtual Connect Now button.
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Section 3 - Configuration
My Wireless Networks
The My Wireless Networks page will allow you to create, edit, and delete wireless network profiles. Every time you connect to a network using the
Wireless Networks page, a profile will automatically be created.
New Button: Click New to create a new wireless network profile (refer to
page 22).
Modify: Click Modify to edit a current profile (refer to page 23).
Delete: Click Delete to remove a profile.
Activate: Click Activate to use a profile. Allow up to 30 seconds to
connect to the wireless network.
Profile Details: The Profile Details section will display information about the
wireless network such as the network name (SSID), network
type (Infrastructure), and if the network is secured.
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Section 3 - Configuration
Add Profile
You may add a new network by clicking the New button from the My Wireless Networks page.
Profile Name: Enter a name for your profile (e.g. Home, Office, Coffee Shop).
SSID: Enter the SSID of the wireless network.
Network Type: Select the network type. If you are connecting to a wireless
router or access point, select Infrastructure.
Security Type: Select the type of security used. Please refer to the Wireless
Security section for more information.
OK Button: Click OK to save your settings.
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Section 3 - Configuration
Modify Profile
You may edit an existing profile by selecting the profile and clicking the Modify button from the My Wireless Networks page.
Profile Name:
SSID:
Enter a name for your profile (e.g. Home, Office,
Coffee Shop).
Displays the SSID of the network.
Network Type:
Displays the network type.
Security Type:
Select the type of security used. Please refer to the
Wireless Security section for more information.
OK Button:
Click OK to save your settings.
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Section 3 - Configuration
Support
If you need help, click the Support button. A panel will appear to the right of the utility which will display information about the utility.
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Section 3 - Configuration
About
The About screen gives you information about the Driver and Utility Versions of the DWA-121.
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Section 3 - Configuration
Connect to a Wireless Network
Using Windows® 7
Windows 7 users may use the built-in wireless utility. If you are using another company’s utility or Windows 2000, please refer to the user manual of
your wireless adapter for help with connecting to a wireless network. Most utilities will have a “site survey” option similar to the Windows 7 utility
as seen below.
If you receive the Wireless Networks Detected bubble, click on the center
of the bubble to access the utility.
or
Right-click on the wireless computer icon in your system tray (lower-right
corner next to the time). Select Connect to a network.
The utility will display any available wireless networks in your area. Click on
a network (displayed using the SSID) and click the Connect button.
If you get a good signal but cannot access the Internet, check you TCP/IP
settings for your wireless adapter. Refer to the Networking Basics section
in this manual for more information.
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Section 3 - Configuration
Connect to a Wireless Network
Using Windows Vista®
Windows Vista users may use the built-in wireless utility. If you are using another company’s utility or Windows 2000, please refer to the user manual
of your wireless adapter for help with connecting to a wireless network. Most utilities will have a “site survey” option similar to the Windows Vista
utility as seen below.
If you receive the Wireless Networks Detected bubble, click on the center
of the bubble to access the utility.
or
Right-click on the wireless computer icon in your system tray (lower-right
corner next to the time). Select Connect to a network.
The utility will display any available wireless networks in your area. Click on
a network (displayed using the SSID) and click the Connect button.
If you get a good signal but cannot access the Internet, check you TCP/IP
settings for your wireless adapter. Refer to the Networking Basics section
in this manual for more information.
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Section 3 - Configuration
Connect to a Wireless Network
Using Windows® XP
Windows XP users may use the built-in wireless utility (Zero Configuration Utility). The following instructions are for Service Pack 2 users. If you are
using another company’s utility or Windows 2000, please refer to the user manual of your wireless adapter for help with connecting to a wireless
network. Most utilities will have a “site survey” option similar to the Windows XP utility as seen below.
If you receive the Wireless Networks Detected bubble, click on the center
of the bubble to access the utility.
or
Right-click on the wireless computer icon in your system tray (lower-right
corner next to the time). Select View Available Wireless Networks.
The utility will display any available wireless networks in your area. Click on
a network (displayed using the SSID) and click the Connect button.
If you get a good signal but cannot access the Internet, check you TCP/IP
settings for your wireless adapter. Refer to the Networking Basics section
in this manual for more information.
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Section 4 - Wireless Security
Wireless Security
This section will show you the different levels of security you can use to protect your data from intruders. The
DWA-121 offers the following types of security:
• WPA2 (Wi-Fi Protected Access 2) • WPA (Wi-Fi Protected Access)
• WPA2-PSK (Pre-Shared Key)
• WPA-PSK (Pre-Shared Key)
What is WPA?
WPA, or Wi-Fi Protected Access, is a Wi-Fi standard that was designed to improve the security features of WEP (Wired Equivalent Privacy).
The 2 major improvements over WEP:
• Improved data encryption through the Temporal Key Integrity Protocol (TKIP). TKIP scrambles the keys using a hashing algorithm
and, by adding an integrity-checking feature, ensures that the keys haven’t been tampered with. WPA2 is based on 802.11i and
uses Advanced Encryption Standard instead of TKIP.
• User authentication, which is generally missing in WEP, through the extensible authentication protocol (EAP). WEP regulates access
to a wireless network based on a computer’s hardware-specific MAC address, which is relatively simple to be sniffed out and stolen.
EAP is built on a more secure public-key encryption system to ensure that only authorized network users can access the network.
WPA-PSK/WPA2-PSK uses a passphrase or key to authenticate your wireless connection. The key is an alpha-numeric password between 8 and 63
characters long. The password can include symbols (!?*&_) and spaces. This key must be the exact same key entered on your wireless router or
access point.
WPA/WPA2 incorporates user authentication through the Extensible Authentication Protocol (EAP). EAP is built on a more secure public key encryption
system to ensure that only authorized network users can access the network.
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Section 4 - Wireless Security
Configure WPA/WPA2 Passphrase
Using the D-Link Wireless Connection Manager
It is recommended to enable WPA-PSK on your wireless router or access point before configuring your wireless adapter. If you are joining an existing
network, you will need to know the WPA-PSK passphrase being used.
1. Open the Wireless Connection Manager by double-clicking on the D-Link icon on your desktop.
2. Highlight the wireless network (SSID) you would like to connect to and click Connect. If the network is using WPA-PSK, the screen (as shown to
the bottom-right) will appear.
3. Enter the WPA-PSK passphrase exactly as it is on your wireless router or access
point. Click the Show text in the password field box to see the passphrase.
Unchecking it will hide it.
4. Click OK to connect to the network. Allow up to 30 seconds to connect.
If you would like to create a new network and enter the WPA-PSK settings, refer to
the next page.
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Section 4 - Wireless Security
It is recommended to enable WPA-PSK on your wireless router or access point before configuring your wireless adapter. Make sure you enter the
passphrase exactly the same on all wireless devices.
1. Open the Wireless Connection Manager by double-clicking on the D-Link icon on your desktop. Click on New to create a new profile or highlight
an existing profile and click Modify.
2. Select WPA/WPA2-Personal under Set Security Option.
3. Select TKIP or AES.
4. Enter the passphrase exactly as it is on your wireless router or access
point.
5. Click OK to connect to the network. Allow up to 30 seconds to connect.
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Section 4 - Wireless Security
Configure WPA/WPA2 Passphrase
Using Windows® 7
It is recommended to enable wireless security (WPA/WPA2) on your wireless router or access point before configuring your wireless adapter. If you
are joining an existing network, you will need to know the security key or passphrase being used.
1. Click on the wireless icon in your system tray (lower-right corner).
2. The utility will display any available wireless networks in your area.
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Section 4 - Wireless Security
3. Highlight the wireless network (SSID) you would like to connect to and click
the Connect button.
If you get a good signal but cannot access the Internet, check your TCP/IP
settings for your wireless adapter. Refer to the Networking Basics section
in this manual for more information.
4. The following window appears while your computer tries to connect to the
router.
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Section 4 - Wireless Security
5. Enter the same security key or passphrase that is on your router and click
Connect. You can also connect by pushing the WPS button on the router.
It may take 20-30 seconds to connect to the wireless network. If the connection
fails, please verify that the security settings are correct. The key or passphrase
must be exactly the same as on the wireless router.
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Section 4 - Wireless Security
Configure WPA/WPA Passphrase
Using Windows Vista®
It is recommended to enable wireless security (WPA/WPA2) on your wireless router or access point before configuring your wireless adapter. If you
are joining an existing network, you will need to know the security key or passphrase being used.
1. Open the Windows Vista® Wireless Utility by right-clicking on the wireless
computer icon in your system tray (lower right corner of screen). Select
Connect to a network.
2. Highlight the wireless network (SSID) you would like to connect to and
click Connect.
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Section 4 - Wireless Security
3. Enter the same security key or passphrase that is on your router and click
Connect.
It may take 20-30 seconds to connect to the wireless network. If the connection
fails, please verify that the security settings are correct. The key or passphrase
must be exactly the same as on the wireless router.
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Section 4 - Wireless Security
Configure WPA/WPA2 Passphrase
Using the Windows® XP Utility
It is recommended to enable WPA-PSK on your wireless router or access point before configuring your wireless adapter. If you are joining an existing
network, you will need to know the WPA-PSK key being used.
1. Open the Windows XP Wireless Utility by right-clicking on the wireless
computer icon in your system tray (lower-right corner of screen). Select
View Available Wireless Networks.
2. Highlight the wireless network (SSID) you would like to connect to
and click Connect.
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Section 4 - Wireless Security
3. The Wireless Network Connection box will appear. Enter the WPA-PSK passphrase
and click Connect.
It may take 20-30 seconds to connect to the wireless network. If the connection fails,
please verify that the WPA-PSK settings are correct. The WPA-PSK passphrase must be
exactly the same as on the wireless router or access point.
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Section 4 - Wireless Security
Configure WPA/WPA2 (RADIUS)
Using the D-Link Wireless Connection Manager
WPA and WPA2 are for advanced users who are familiar with using a RADIUS server and setting up certificates.
1. Open the Wireless Connection Manager by double-clicking on the D-Link icon on your
desktop. Click on New to create a new profile or highlight an existing profile and click
Modify.
2. Select WPA/WPA2-Enterprise under Set Security Option and then select TKIP or AES.
3. Click on Advanced Config to continue.
4. Next to EAP Type, select EAP-TLS or PEAP. Extensible Authentication Protocols allow
devices on the network to request authentication from the RADIUS server in the network.
All the devices on the network must use the same EAP type when using a RADIUS server
for authentication. Some RADIUS servers require that the Validate Server field be selected.
Check this field if your RADIUS server requires validation.
5. Select an User Certificate from the drop-down menu.
6. Enter the login information required to authenticate.
7. Click Add to enter the IP address(es) of your RADIUS servers.
8. Click OK to save your settings.
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Section 5 - Troubleshooting
Troubleshooting
This chapter provides solutions to problems that can occur during the installation and operation of the DWA-121. Read the following descriptions
if you are having problems. (The examples below are illustrated in Windows® XP. If you have a different operating system, the screenshots on your
computer will look similar to the following examples.)
1. How do I know if my adapter is installed properly?
Go to Start > My Computer > Properties.
Select the Hardware Tab.
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Section 5 - Troubleshooting
Click the + sign next to Network Adapters.
Right-click on D-Link DWA-121 USB Adapter.
Select Properties to check that the drivers are installed properly.
D-Link DWA-121 Wireless N 150 Pico USB Adapter
Look under Device Status to check that the device is working
properly. Click OK to continue.
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Wireless N 150 Pico USB Adapter
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Section 5 - Troubleshooting
2. The computer does not recognize the DWA-121 Wireless N 150 Micro USB Adapter.
Make sure that the DWA-121 Wireless USB Adapter is properly seated in the computer’s USB port. If Windows does not detect the hardware upon
insertion of the adapter, try a different port. Also, make sure to completely remove the drivers that were previously loaded.
3. The computer with the DWA-121 installed is unable to connect to the wireless network and/or the Internet.
• Check that the LED indicators for the broadband modem are indicating normal activity. If not, there may be a problem with the broadband
connection.
• Check that the LED indicators on the wireless router are functioning properly. If not, check that the AC power and Ethernet cables are
firmly connected.
• Check that the IP Address, subnet mask, gateway, and DNS settings are correctly obtained from your network. Confirm your wireless
key.
• In Infrastructure mode, make sure the same Service Set Identifier (SSID) is specified on the settings for the wireless clients and access
points. The SSID factory default setting for D-Link products is default. (Double-click on the WLAN icon in the taskbar. The Link Info
screen will display the SSID setting.)
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Section 5 - Troubleshooting
Check that the Network Connection for the wireless client is configured properly. Select AP (Infrastructure) when connecting to an access point.
Double-click on the WLAN icon in the taskbar > click on Configuration to change the settings for the wireless adapter.
If Security is enabled, make sure that the correct encryption keys are entered on both the DWA-121 and the access point. Double-click on the WLAN
icon in the taskbar > click Encryption. Check to see that the key selected is set to the same key as other devices on the network.
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Section 5 - Troubleshooting
Windows® 7 Troubleshooting
Go to Start > Computer > Properties.
Select the Device Manager
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Section 5 - Troubleshooting
Click the + sign next to Network Adapters.
Right-click on D-Link DWA-121 Wireless N 150 Pico USB Adapter.
Select Properties to check that the drivers are installed properly.
Look under Device Status to check that the device is working properly. Click OK to continue.
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Appendix A - Wireless Basics
Wireless Basics
D-Link wireless products are based on industry standards to provide easy-to-use and compatible high-speed wireless connectivity within your
home, business or public access wireless networks. Strictly adhering to the IEEE standard, the D-Link wireless family of products will allow you to
securely access the data you want, when and where you want it. You will be able to enjoy the freedom that wireless networking delivers.
A wireless local area network (WLAN) is a cellular computer network that transmits and receives data with radio signals instead of wires. Wireless
LANs are used increasingly in both home and office environments, and public areas such as airports, coffee shops and universities. Innovative ways
to utilize WLAN technology are helping people to work and communicate more efficiently. Increased mobility and the absence of cabling and other
fixed infrastructure have proven to be beneficial for many users.
Wireless users can use the same applications they use on a wired network. Wireless adapter cards used on laptop and desktop systems support the
same protocols as Ethernet adapter cards.
Under many circumstances, it may be desirable for mobile network devices to link to a conventional Ethernet LAN in order to use servers, printers
or an Internet connection supplied through the wired LAN. A Wireless Router is a device used to provide this link.
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Appendix A - Wireless Basics
What is Wireless?
Wireless or Wi-Fi technology is another way of connecting your computer to the network without using wires. Wi-Fi uses radio
frequency to connect wirelessly, so you have the freedom to connect computers anywhere in your home or office network.
Why D-Link Wireless?
D-Link is the worldwide leader and award winning designer, developer, and manufacturer of networking products. D-Link
delivers the performance you need at a price you can afford. D-Link has all the products you need to build your network.
How does wireless work?
Wireless works similar to how cordless phone work, through radio signals to transmit data from one point A to point B. But wireless
technology has restrictions as to how you can access the network. You must be within the wireless network range area to be able
to connect your computer. There are two different types of wireless networks Wireless Local Area Network (WLAN), and Wireless
Personal Area Network (WPAN).
Wireless Local Area Network (WLAN)
In a wireless local area network, a device called an Access Point (AP) connects computers to the network. The access point has
a small antenna attached to it, which allows it to transmit data back and forth over radio signals. With an indoor access point as
seen in the picture, the signal can travel up to 300 feet. With an outdoor access point the signal can reach out up to 30 miles to
serve places like manufacturing plants, industrial locations, college and high school campuses, airports, golf courses, and many
other outdoor venues.
Wireless Personal Area Network (WPAN)
Bluetooth is the industry standard wireless technology used for WPAN. Bluetooth devices in WPAN operate in a range up to 30
feet away.
Compared to WLAN the speed and wireless operation range are both less than WLAN, but in return it doesn’t use nearly as much
power which makes it ideal for personal devices, such as mobile phones, PDAs, headphones, laptops, speakers, and other devices
that operate on batteries.
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Appendix A - Wireless Basics
Who uses wireless?
Wireless technology as become so popular in recent years that almost everyone is using it, whether it’s for home, office, business,
D-Link has a wireless solution for it.
Home
• Gives everyone at home broadband access
• Surf the web, check email, instant message, and etc
• Gets rid of the cables around the house
• Simple and easy to use
Small Office and Home Office
• Stay on top of everything at home as you would at office
• Remotely access your office network from home
• Share Internet connection and printer with multiple computers
• No need to dedicate office space
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Appendix A - Wireless Basics
Where is wireless used?
Wireless technology is expanding everywhere not just at home or office. People like the freedom of mobility and it’s becoming so popular that
more and more public facilities now provide wireless access to attract people. The wireless connection in public places is usually called “hotspots”.
Using a D-Link wireless desktop adapter with your laptop, you can access the hotspot to connect to Internet from remote locations like: Airports,
Hotels, Coffee Shops, Libraries, Restaurants, and Convention Centers.
Wireless network is easy to setup, but if you’re installing it for the first time it could be quite a task not knowing where to start. That’s why we’ve put
together a few setup steps and tips to help you through the process of setting up a wireless network.
Tips
Here are a few things to keep in mind, when you install a wireless network.
Centralize your router or Access Point
Make sure you place the router/access point in a centralized location within your network for the best performance. Try to place the router/access
point as high as possible in the room, so the signal gets dispersed throughout your home. If you have a two-story home, you may need a repeater
to boost the signal to extend the range.
Eliminate Interference
Place home appliances such as cordless telephones, microwaves, and televisions as far away as possible from the router/access point. This would
significantly reduce any interference that the appliances might cause since they operate on same frequency.
Security
Don’t let your next-door neighbors or intruders connect to your wireless network. Secure your wireless network by turning on the WPA security
feature on the router. Refer to product manual for detail information on how to set it up.
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Appendix A - Wireless Basics
Wireless Modes
There are basically two modes of networking:
• Infrastructure – All wireless clients will connect to an access point or wireless router.
• Ad-Hoc – Directly connecting to another computer, for peer-to-peer communication, using wireless network adapters on each
computer.
An Infrastructure network contains an Access Point or wireless router. All the wireless devices, or clients, will connect to the wireless router or access
point.
An Ad-Hoc* network contains only clients, such as laptops with wireless USB Adapters. All the adapters must be in Ad-Hoc mode to communicate.
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Appendix B - Networking Basics
Networking Basics
Check your IP address
After you install your new D-Link wireless adapter and have established a wireless connection, by default, the TCP/IP settings should be set to obtain
an IP address from a DHCP server (i.e. router) automatically. To verify your IP address, please follow the steps below.
Windows® XP/2000 Users
• Click on Start > Run. In the run box type cmd and click OK.
• At the prompt, type ipconfig and press Enter.
• This will display the IP address, subnet mask, and the default gateway of your adapter.
Windows 7/Vista® Users
• Click Start > All Programs > Accessories > Command Prompt. You may need
administrative access to run this application.
• For all additional prompt windows inquiring of running the command prompt
application, select Yes, OK, or Continue.
• At the prompt, type ipconfig and press Enter.
• This will display the IP address, subnet mask, and default gateway of your adapter.
If the address is 0.0.0.0, check your adapter installation, security settings, and the settings on your router. Some firewall software programs may
block a DHCP request on newly installed adapters.
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Appendix B - Networking Basics
Statically Assign an IP address
If you are not using a DHCP capable gateway/router, or you need to assign a static IP address, please follow the steps below:
Windows® XP/2000 Users
• Windows XP - Click on Start > Control Panel. Make sure you are in Classic View. Double-click on the Network Connections icon.
Windows 2000 – From the desktop, right-click My Network Places > Properties.
• Right-click on the Local Area Connection which represents your D-Link wireless network adapter (or other adapter) which will be connected
to your router.
• Highlight Internet Protocol (TCP/IP) and click Properties.
• Click Use the following IP address and enter an IP address that is on the same subnet as your network or LAN IP address on your router.
Example: If the router’s LAN IP address is 192.168.0.1, make your IP address 192.168.0.X where X is a number between 2 and 99. Make sure
that the number you choose is not in use on the network.
• Set Default Gateway the same as the LAN IP address of your router or gateway.
• Set Primary DNS the same as the LAN IP address of your router or gateway.
• The Secondary DNS is optional (you may enter a DNS server from your ISP).
• Click OK to save your settings.
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Appendix B - Networking Basics
Windows 7/Vista® Users
• Click on Start > Control Panel (make sure you are in Classic View). Double-click on the Network and Sharing Center icon. If you are using
Windows Vista, click on Manage network connections along the left panel in the window. For Windows 7, click on Change adapter settings.
• Right-click on the Wireless Network Connection which represents your D-Link wireless network adapter.
• Highlight Internet Protocol Version 4 (TCP /IPv4) and click Properties.
• Click Use the following IP address and enter an IP address that is on the same
subnet as your network or LAN IP address on your router or network.
Example: If the router’s LAN IP address is 192.168.0.1, make your IP address
192.168.0.X where X is a number between 2 and 99. Make sure that the number
you choose is not in use on the network.
• Set Default Gateway the same as the LAN IP address of your router or gateway.
• Set Primary DNS the same as the LAN IP address of your router or gateway.
• The Secondary DNS is optional (you may enter a DNS server from your ISP).
• Click OK to save your settings.
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Appendix C - Technical Specifications
Technical Specifications
Standards
• IEEE 802.11n
• IEEE 802.11g
Bus Type
• USB 2.0 (1.1 compatible)
Security
• WPA/WPA2 - Wi-Fi Protected Access (AES, MIC,
IV Expansion, Shared Key Authentication)
• WPS (PBC/PIN)
Media Access Control
• CSMA/CA with ACK
Frequency Range
• 2.4GHz to 2.483GHz
Power Consumption (802.11n)
• 230 mA at continuous transmit mode
• 120 mA at receive mode
Modulation Technology
• Orthogonal Frequency
Division Multiplexing (OFDM)
• Complementary Code Keying (CCK)
Transmitter Power Output
• 11b: 17dBm
• 11g: 15dBm
• 11n: 14 dBm at HT 20, 13 dBm at HT 40
Operating Voltage
• 5 VDC +/- 10%
Operating Temperature
• 0 to 40 ºC (32 to 104 ˚F)
Operating Humidity
• 10% to 90% maximum (non-condensing)
Dimensions
• .75” x .05” x 0.2”
Weight
• 2.2 g
Certifications
• FCC Class B
• IC
• Wi-Fi
• CE
• C-Tick
* Maximum wireless signal rate derived from IEEE Standard 802.11n and 802.11g specifications. Actual data throughput will vary. Network conditions and environmental factors,
including volume of network traffic, building materials and construction, and network overhead, lower actual data throughput rate. Environmental factors will adversely affect
wireless signal range.
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