TP Link Network Card TL WN550G User Manual

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COPYRIGHT & TRADEMARKS  
Specifications are subject to change without notice.  
is a registered  
trademark of TP-LINK Technologies Co., Ltd. Other brands and product names are  
trademarks or registered trademarks of their respective holders.  
No part of the specifications may be reproduced in any form or by any means or used to  
make any derivative such as translation, transformation, or adaptation without permission  
from TP-LINK Technologies Co., Ltd. Copyright © 2006 TP-LINK Technologies Co., Ltd.  
All rights reserved.  
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FCC 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 or more of the following  
measures:  
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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.  
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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.  
(2) This device must accept any interference received, including interference that may  
cause undesired operation.  
Changes or modifications to this unit not expressly approved by the party responsible for  
compliance could void the user's authority to operate the equipment.  
FCC RF Radiation Exposure Statement:  
This equipment complies with FCC RF radiation exposure limits set forth for an  
uncontrolled environment. This device and its antenna must not be co-located or  
operating in conjunction with any other antenna or transmitter.  
To comply with FCC RF exposure compliance requirements, the antenna used for this  
transmitter must be installed to provide a separation distance of at least 20 cm from all  
persons and must not be co-located or operating in conjunction with any other antenna or  
transmitter”.  
CE Declaration of Conformity  
For the following equipment: TL-WN510G/TL-WN550G/TL-WN551G  
Is herewith confirmed to comply with the requirements set out in the Council Directive on  
the Approximation of the Laws of the Member States relating to Electromagnetic  
Compatibility (89/336/EEC), Low-voltage Directive (73/23/EEC) and the Amendment  
Directive (93/68/EEC), the procedures given in European Council Directive 99/5/EC and  
89/3360EEC.  
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The equipment was passed. The test was performed according to the following European  
standards:  
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EN 300 328 V.1.4.1 (2003)  
EN 301 489-1 V.1.4.1 (2002) / EN 301 489-17 V.1.2.1 (2002)  
EN 60950-1: 2001  
European standards dictate maximum radiated transmit power of 100mW EIRP and  
frequency range 2.400-2.4835GHz; In France, the equipment must be restricted to the  
2.4465-2.4835GHz frequency range and must be restricted to indoor use.  
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TL-WN510G/TL-WN550G/TL-WN551G 54M Wireless Adapter User Guide  
Package Contents  
The following contents should be found in your box:  
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One TL-WN510G/TL-WN550G/TL-WN551G Wireless Adapter  
Quick Installation Guide  
One Resource CD for TL-WN510G/TL-WN550G/TL-WN551G, including:  
TP-LINK Wireless Client Utility (TWCU) and Drivers  
User Guide  
Other Helpful Information  
Note: If any of the listed contents are damaged or missing, please contact the retailer  
from whom you purchased the TL-WN510G/TL-WN550G/TL-WN551G Wireless Adapter  
for assistance.  
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TL-WN510G/TL-WN550G/TL-WN551G 54M Wireless Adapter User Guide  
Chapter 1: Introduction  
1.1 Overview of the product  
The TP-LINK 54M Wireless Adapter TL-WN510G/TL-WN550G/TL-WN551G gives you the  
flexibility to install your PC or notebook PC in the most convenient location available,  
without the cost of running network cables.  
The adapter's auto-sensing capability allows high packet transfer rate of up to 54Mbps for  
maximum throughput, or dynamic range shifting to lower speeds due to distance or  
operating limitations in an environment with a lot of electromagnetic interference. It can  
also interoperate with all 11Mbps wireless (802.11b) products. Your wireless  
communications are protected by up to 152-bit WEP and WPA encryption for high security.  
It adopts 2x to 3x eXtended RangeTM WLAN transmission technology so that  
transmission distance is 2-3 times of traditional 11g/b solutions, up to 855.36m tested in  
China. Transmission range is extended to 4-9 times.  
1.2 Features  
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Complies with IEEE802.11g, IEEE802.11b standards  
Adopts 2x to 3x eXtended RangeTM wireless LAN transmission technology  
Supports WPA/WPA2 data security, IEEE802.1x authentication, TKIP/AES encryption,  
64/128/152-bit WEP encryption  
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Supports 54/48/36/24/18/12/9/6Mbps or 11/5.5/3/2/1Mbps wireless LAN data transfer  
rates  
Provides 32-bit PCI interface (TL-WN550G/TL-WN551G) or 32-bit CardBus interface  
(TL-WN510G)  
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Supports Ad-Hoc and Infrastructure modes  
Supports roaming between access points when configured in Infrastructure mode  
Ease to configure and provides monitoring information  
Supports Windows 98Se, Me, 2000, XP  
Internal Antenna (TL-WN510G)  
Detachable reverse SMA connector antenna (TL-WN551G)  
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TL-WN510G/TL-WN550G/TL-WN551G 54M Wireless Adapter User Guide  
1.3 LED Status  
1.3.1 TL-WN510G LED Indications  
LED Indications Status  
Working Status  
Status Green  
Activity Green  
Status Green  
Activity Green  
Intermittently  
The adapter is in an electricity saving status.  
Not lit  
Lit  
The adapter is on wake up status.  
Not lit  
Flashing  
Alternately  
Flashing  
Alternately  
Intermittently  
Intermittently  
Flashing  
Flashing  
Status Green  
Activity Green  
The adapter is trying to scan a networking  
connection.  
Status Green  
Activity Green  
Status Green  
Activity Green  
The adapter is already connected but is not  
transmitting or receiving data.  
The adapter is transmitting or receiving data.  
1.3.2 TL-WN550G/TL-WN551G LED Indications  
LED Indications Status Working Status  
The adapter is in an electricity saving status or  
the adapter is already connected but is not  
transmitting or receiving data.  
Status Green  
Intermittently  
Status Green  
Status Green  
Lit  
The adapter is on wake up status.  
Flashing  
The adapter is transmitting and receiving data.  
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TL-WN510G/TL-WN550G/TL-WN551G 54M Wireless Adapter User Guide  
Chapter 2: Installation Guide  
2.1 Hardware Installation  
2.1.1 TL-WN550G/TL-WN551G Hardware Installation  
To install the adapter, follow these steps listed below:  
1. Turn off your desktop PC and disconnect the power.  
2. Open your PC case and locate an available PCI slot on the motherboard. Remove  
the metal slot cover on the back of the PC. Check with your computer manufacturer  
for instructions if needed.  
3. Slide the PCI Adapter into the PCI slot. Make sure that all of its pins are touching the  
slot's contacts. Once the adapter is firmly in place, secure its fastening tab to your  
PC's chassis with a mounting screw. Then, close your PC case.  
4. Reconnect your PC’s power and turn on your desktop PC.  
2.1.2 TL-WN510G Hardware Installation  
To install the adapter, follow these steps listed below:  
1. Locate an available CardBus slot on your laptop.  
2. With the connector pin end facing the CardBus slot and the label facing up, slide the  
Adapter into the CardBus slot until it locks in place.  
3. The Status LED should Intermittent flashing when the Adapter is installed correctly.  
2.2 Software Installation  
2.2.1 Overview  
The Adapter’s Setup Wizard will guide you through the Installation procedure for Windows  
98Se, Me, 2000, XP. The Setup Wizard will install the TP-LINK Wireless Client Utility  
(TWCU) and drivers.  
When you install the hardware before installing the software, the system will prompt  
“Found New Hardware Wizard”, click Cancel, and run the Setup Wizard program on the  
CD-ROM.  
The Setup steps for Windows 98Se, Me, 2000 and XP are very similar. The following  
setup steps are for Windows 2000.  
2.2.2 Software Installation for Windows 2000  
1. Insert the Resource CD into your CD-ROM drive, click Start and choose Run. In the  
field that appears, enter F:\XXX\Setup.exe (if “F” is the letter of your CD-ROM drive;  
XXX is the setup program path, which is labeled on the Resource CD), figure 2-1  
should then appear.  
2. You can click Cancel to end the installation on the Preparing Setup screen, figure 2-1.  
Otherwise, the Setup Wizard will display a screen similar to that shown in figure 2-2  
after a moment.  
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TL-WN510G/TL-WN550G/TL-WN551G 54M Wireless Adapter User Guide  
Figure 2-1 TP-LINK Wireless Client Utility – Install Shield Wizard  
3. To continue, click Next on the screen, figure 2-2. Click Cancel to end the Installation.  
Figure 2-2 TP-LINK Wireless Client Utility Installation Program  
4. The Setup Wizard will ask you to choose a Setup type in figure 2-3. It is  
recommended that you select Install Client Utilities and Driver. Select Install  
Driver Only to install driver only, select Make Driver Installation Diskette(s) to  
make the diskette(s) as the installation driver. Select Install Client Utilities and  
Driver and click Next to continue the Installation. Click Back to return to the previous  
page, or click Cancel to end the Installation.  
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TL-WN510G/TL-WN550G/TL-WN551G 54M Wireless Adapter User Guide  
Figure 2-3 Select the setup type.  
5. Figure 2-4 should appear. Click Yes to continue the Installation, or click No to end the  
Installation.  
Figure 2-4 Question  
6. Click Browse to change the destination location for the software in figure 2-5. Click  
Next to continue the Installation. Click Back to return to the previous page, or click  
Cancel to end the Installation.  
Figure 2-5 Choose Destination Location  
7. The Setup Wizard will ask you to create a new folder name or select one from the  
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Existing Folders list shown in figure 2-6. It is recommended that you keep the  
default value. Click Next to continue the Installation. Click Back to return to the  
previous page, or click Cancel to end the Installation.  
Figure 2-6 Select a Program Folder  
8. The Setup Wizard will notify you of how to proceed with the installation, shown in  
figure 2-7. Click OK to continue the Installation.  
Figure 2-7 Information prompt  
9. While files are copying, you will see a warning box, shown in figure 2-8. Please select  
YES to continue installation. Our drivers have been tested thoroughly, and are able to  
work with the operating system.  
Figure 2-8 Widows 2000 Warning Box  
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TL-WN510G/TL-WN550G/TL-WN551G 54M Wireless Adapter User Guide  
Note: In Windows XP, the warning box is similar to that shown figure 2-8a, Please  
select Continue Anyway to continue installation.  
Figure 2-8a Windows XP Warning Box  
10. After the files have been successfully copied, the screen in figure 2-9 will appear.  
Click OK to reboot the system.  
Figure 2-9 Finish  
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TL-WN510G/TL-WN550G/TL-WN551G 54M Wireless Adapter User Guide  
Chapter 3: Configuration  
TP-LINK Wireless Adapter TL-WN510G/TL-WN550G/TL-WN551G can be configured by  
TP-LINK Wireless Client Utility (TWCU). This chapter describes how to configure your  
TP-LINK Wireless Adapter for wireless connectivity on your Wireless Local Area Network  
(WLAN) and use the data security encryption features.  
After Installing the Adapter, the Adapter’s tray icon  
will appear in your system tray. It  
appears at the bottom of the screen, and shows the signal strength using color and the  
received signal strength indication (RSSI).  
If the icon is gray, there is no connection.  
If the icon is red, there is poor signal strength and the RSSI is less than 5dB.  
If the icon is yellow, there is poor signal strength and the RSSI is between 5dB and  
10dB.  
If the icon is green, there is good signal strength and the RSSI is between 10dB  
and 20dB.  
If the icon is green, there is excellent signal strength and the RSSI is more than  
20dB.  
Double-click the icon and the TWCU utility will run. You can also run the utility by clicking  
the Start>Program>TP-LINK>TP-LINK Wireless Client Utility. The TWCU utility provides a  
complete and easy to use set of tools to:  
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Display current status information  
Edit and add configuration profiles  
Display current diagnostics information  
The section below introduces these above capabilities.  
3.1 Current Status  
The Current Status tab contains general information about the program and its operations.  
The Current Status tab does not require any configurations.  
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TL-WN510G/TL-WN550G/TL-WN551G 54M Wireless Adapter User Guide  
Figure 3-1 Current Status  
The following table describes the items found on the Current Status screen.  
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Profile Name - The name of current selected configuration profile. Set up the  
configuration name on the General tab of Profile Management.  
Link Status - Shows whether the station is associated to the wireless network.  
Wireless Mode - Displays the wireless mode. Configure the wireless mode on the  
Advanced tab of Profile Management.  
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Network Type - The type of network and the station currently connected. The options  
include:  
Infrastructure (access point)  
Ad Hoc  
Configure the network type on the Advanced tab of Profile Management.  
IP Address - Displays the computer’s IP address.  
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Current Channel - Shows the currently connected channel.  
Data Encryption - Displays the encryption type the driver is using. Configure the  
encryption type on the Security tab of Profile Management.  
Server Based Authentication - Shows whether server based authentication is used.  
Signal Strength - Shows the strength of the signal.  
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Note: In the TWCU utility, access the General tab, Security tab and Advanced tab by  
clicking New or Modify on the Profile Management tab.  
Click Advanced to see advanced information about the program and its operations. For  
more information, please refer to the help file of the utility.  
Figure 3-2 Advance Status  
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3.2 Profile Management  
Click the Profile Management tab of the TWCU Utility and the Profile Management screen  
will appear, figure 3-3. The Profile Management screen provides tools to:  
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Add a profile  
Edit a profile  
Remove a profile  
Switch to another Profile  
Import a Profile  
Export a Profile  
Scan Available Networks  
Order profiles  
Figure 3-3 Profile Management tab  
3.2.1 Add or Modify a Configuration Profile  
To add a new configuration profile, click New on the Profile Management tab. To modify a  
configuration profile, select the configuration from the Profile list and click Modify.  
The Profile Management dialog box will display a screen similar to that shown in Figure  
3-4.  
1. Edit the General tab  
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Profile Name - Identifies the configuration profile. This name must be unique. Profile  
names are not case-sensitive.  
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Client Name - Identifies the client machine.  
Network Names (SSIDs) - The IEEE 802.11 wireless network name. This field has a  
maximum limit of 32 characters.  
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TL-WN510G/TL-WN550G/TL-WN551G 54M Wireless Adapter User Guide  
Figure 3-4 General Tab of Profile Management  
2. Edit the Security tab  
Edit the fields in the Security tab of Profile Management to configure the profile. To define  
the security mode, select the radio button of the desired security mode.  
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WPA/WPA2: Wi-Fi Protected Access  
WPA/WPA2 Passphrase: Wi-Fi Protected Access Passphrase  
802.1x: Enables 802.1x security.  
Shared Key (Static WEP): Enables the use of shared keys that are defined on both  
the access point and the station. To define shared encryption keys, choose the  
Shared Key radio button and click Configure to fill in the Define Shared Keys  
window.  
None: No security (not recommended).  
Note: If the access point that the wireless adapter is associating to has WEP set to  
Optional and the client has WEP enabled, make sure that Allow Association to Mixed  
Cells is checked on the Security Tab to allow association. To complete WEP encryption  
configuration, you must select the 802.11 Authentication Mode as appropriate on the  
Advanced tab of this Profile Management dialog.  
Figure 3-5 Security tab of Profile Management  
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Figure 3-6 Define Shared Keys  
3. Edit the Advanced tab  
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Power Save Mode -  
Maximum - Selects maximum mode to let the access point buffer incoming  
messages for the wireless adapter. The adapter will detect the access point if  
any messages are waiting periodically.  
Normal - In Normal mode, the adapter will be switched to maximum mode  
automatically when no large packets are retrieved.  
Off - turns power saving off, thus powering up the wireless adapter continuously  
for a short message response time.  
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802.11b Preamble: Specifies the preamble setting in 802.11b. The default setting is  
Short & Long (access point mode), which allows both short and long headers in the  
802.11b frames. The adapter can only use short radio headers if the access point  
supports and uses them. Set to Long Only to override allowing short frames.  
Wireless Mode: Specifies 2.4 GHz 54 Mbps or 2.4 GHz 11 Mbps operation in an  
access point network. The wireless adapter must match the wireless mode of the  
access point with which it associates.  
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Wireless Mode when Starting an Ad Hoc Network: Specifies 2.4 GHz 54/11 Mbps  
to start an Ad Hoc network if no matching network name is found after scanning all  
available modes. This mode also allows the selection of the channel the wireless  
adapter uses. The channels available depend on the regulatory domain. If the  
adapter finds no other ad hoc adapters, the channel that the adapter starts the ad hoc  
network with will be selected automatically. The wireless adapter must match the  
wireless mode and channel of the clients it associates.  
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802.11 Authentication Mode: Select which mode the wireless adapter uses to  
authenticate to an access point:  
Automatic causes the adapter to attempt authentication using shared, but  
switches it to open authentication if shared fails.  
Open System enables an adapter to attempt authentication regardless of its  
WEP settings. It will only associate with the access point if the W EP keys on  
both the adapter and the access point match.  
Shared-key only allows the adapter to associate with access points that have  
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the same WEP key.  
For infrastructure (access point) networks, click Preferred APs… to specify up to four  
access points to the client adapter that attempts to be associated to the access points.  
Figure 3-7 Advanced tab of Profile Management  
3.2.2 Remove a profile  
1. Go to the Profile Management tab.  
2. Select the profile name to remove in the Profiles List.  
3. Click Remove.  
3.2.3 Switch another Profile  
1. Go to the Profile Management tab.  
2. Click on the profile name in the Profiles List.  
3. Click Activate.  
3.2.4 Import a Profile  
1. From the Profile Management tab, click Import…. The Import Profile will then appear.  
2. Browse to the directory where the profile is located.  
3. Highlight the profile name.  
4. Click Open, the imported profile will then appear in the Profiles List.  
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TL-WN510G/TL-WN550G/TL-WN551G 54M Wireless Adapter User Guide  
Figure 3-8 Import Profile Dialog  
3.2.5 Export a Profile  
1. From the Profile Management tab, highlight the profile to export.  
2. Click Export…, the Export Profile window will then appear.  
3. Browse the directory to export the profile to.  
4. Click Save. The profile should then be exported to the specified location.  
Figure 3-9 Export Profile Dialog  
3.2.6 Scan Available Networks  
1. Click Scan on the Profile Management, the Available Infrastructure and Ad Hoc  
Networks window will appear.  
2. Click Refresh to refresh the list at any time.  
3. Highlight a network name and click Activate to connect an available network. If no  
configuration profile exists for that network, the Profile Management window will open  
the General tab. Fill in the Profile name and click OK to create the configuration  
profile for that network.  
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TL-WN510G/TL-WN550G/TL-WN551G 54M Wireless Adapter User Guide  
Figure 3-10 Scan Available Networks Dialog  
3.2.7 Auto Profile Selection Management  
The auto selection feature allows the wireless adapter to automatically select a profile  
from the list of profiles and use it to connect to the network. To add a new profile into the  
Auto Selected Profiles list, please follow these steps.  
1. On the Profile Management tab, click Order Profiles….  
2. The Auto Profiles Selection management window will appear, with a list of all created  
profiles in the Available Profiles box.  
3. Highlight the profiles to add to auto profile selection, and click Add. The profile will  
appear in the Auto Selected Profiles box.  
4. Highlight a profile in the Auto Selected Profiles box.  
5. Click Move Up or Move Down as appropriate. Note: The first profile in the Auto  
Selected Profiles box has highest priority, and the last profile has lowest priority.  
6. Click OK.  
7. Check the Auto Select Profiles checkbox on the Profile Management tab.  
Note: When auto profile selection is enabled by checking Auto Select Profiles on the  
Profile Management tab, the client adapter will scan for an available network. The profile  
with the highest priority and the same SSID as one of the found networks will be used to  
connect to the network. If the connection fails, the client adapter will try the next highest  
priority profile that matches the SSID until an available network is found.  
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TL-WN510G/TL-WN550G/TL-WN551G 54M Wireless Adapter User Guide  
Figure 3-11 Auto Profile Selection Management Dialog  
3.3 Diagnostics  
The Diagnostics tab of the TP-LINK Wireless Client Utility (TWCU) provides buttons  
used to retrieve receiving and transmitting statistics. The Diagnostics tab does not require  
any configuration.  
The Diagnostics tab lists the following receive and transmit diagnostics for frames  
received or transmitted by the wireless network adapter:  
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Multicast frames transmitted and received  
Broadcast frames transmitted and received  
Unicast frames transmitted and received  
Total bytes transmitted and received  
Figure 3-12 Diagnostics tab  
3.3.1 Check Driver Information  
The Adapter Information contains general information about the wireless network  
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TL-WN510G/TL-WN550G/TL-WN551G 54M Wireless Adapter User Guide  
adapter and the Network Driver Interface Specification (NDIS) driver. Access the adapter  
information from the Diagnostics tab.  
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Card Name - The name of the wireless network adapter.  
MAC Address - The MAC address of the wireless network adapter.  
Driver - The driver name and path of the wireless network adapter driver.  
Driver Version - The version of the wireless network adapter driver.  
Driver Date - The creation date of the wireless network adapter driver.  
Client Name - The name of the client computer.  
3.3.2 Check Receive and Transmit Statistical Information  
The Advanced Statistics show receiving and transmitting statistical information for the  
following receive and transmit diagnostics for frames received by or transmitted to the  
wireless network adapter.  
Figure 3-13 Advanced Statistics  
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TL-WN510G/TL-WN550G/TL-WN551G 54M Wireless Adapter User Guide  
Appendix A: Specifications  
Normal  
Interface  
TL-WN510G: 32-bit CardBus  
TL-WN550G/TL-WN551G: 32-bit PCI  
Standards  
IEEE802.11b; IEEE802.11g  
Operating System  
Transmission  
Distance  
Windows 98Se, Me, 2000, XP  
Indoor up to 100m, outdoor up to 300m (Standard transmission  
distance, it is limited to the environment).  
Indoor up to 200m, outdoor up to 830m (Adopt 2x to 3x eXtended  
RangeTM WLAN transmission technology, it is limited to the  
environment)  
Radio Data Rate  
Modulation  
54/48/36/24/18/12/9/6Mbps or 11/5.5/3/2/1Mbps  
(Auto Rate Sensing)  
1M DBPSK; 2M DQPSK; 5.5M, 11M CCK; 6M, 9M, 12M, 18M,  
24M, 36M, 48M, 54M OFDM;  
Media  
Access CSMA/CA with ACK  
Protocol  
Transmit Power  
Data Security  
Frequency  
Spread Spectrum  
Power  
18dBm (Typical)  
WPA/WPA2; 64/128/152-bit WEP; TKIP/AES  
2.4 ~ 2.4835GHz  
Direct Sequence Spread Spectrum (DSSS)  
Typically 685mA in full Transmit (TX), 515mA in full Receive (RX)  
Consumption  
Safety & Emissions FCC, CE  
Environmental and Physical  
Operating Temp.  
Storage Temp.  
Humidity  
0~40(32~104)  
-40– 70(-40~158)  
10% - 95% RH, Non-condensing  
Dimensions  
(W×D×H)  
4.5×2.1×.2 in. (115×54×5 mm) (TL-WN510G)  
5.2×4.8×.9 in. (133×121×22 mm) (TL-WN550G/TL-WN551G)  
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TL-WN510G/TL-WN550G/TL-WN551G 54M Wireless Adapter User Guide  
Appendix B: Glossary  
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2x to 3x eXtended RangeTM WLAN Transmission Technology - The WLAN device  
with 2x to 3x eXtended RangeTM WLAN transmission technology make its sensitivity  
up to 105 dB, which gives users the ability to have robust, longer-range wireless  
connections. With this range-enhancing technology, a 2x to 3x eXtended RangeTM  
based client and access point can maintain a connection at as much as three times  
the transmission distance of traditional 802.11b and 802.11g products, for a coverage  
area that is up to nine times greater. A traditional 802.11b and 802.11g product  
transmission distance is about 300m, A TP-LINK 2x to 3x eXtended RangeTM based  
client and access point can maintain a connection transmission distance may be up  
to 830m.  
¾
¾
¾
802.11b - The 802.11b standard specifies a wireless product networking at 11 Mbps  
using direct-sequence spread-spectrum (DSSS) technology and operating in the  
unlicensed radio spectrum at 2.4GHz, and WEP encryption for security. 802.11b  
networks are also referred to as Wi-Fi networks.  
802.11g - specification for wireless networking at 54 Mbps using direct-sequence  
spread-spectrum (DSSS) technology, using OFDM modulation and operating in the  
unlicensed radio spectrum at 2.4GHz, and backward compatibility with IEEE 802.11b  
devices, and WEP encryption for security.  
Ad-hoc Network - An ad-hoc network is a group of computers, each with a wireless  
adapter, connected as an independent 802.11 wireless LAN. Ad-hoc wireless  
computers operate on a peer-to-peer basis, communicating directly with each other  
without the use of an access point. Ad-hoc mode is also referred to as an  
Independent Basic Service Set (IBSS) or as peer-to-peer mode, and is useful at a  
departmental scale or SOHO operation.  
¾
DSSS (Direct-Sequence Spread Spectrum) - DSSS generates a redundant bit  
pattern for all data transmitted. This bit pattern is called a chip (or chipping code).  
Even if one or more bits in the chip are damaged during transmission, statistical  
techniques embedded in the receiver can recover the original data without the need  
for retransmission. To an unintended receiver, DSSS appears as low power  
wideband noise and is rejected (ignored) by most narrowband receivers. However, to  
an intended receiver (i.e. another wireless LAN endpoint), the DSSS signal is  
recognized as the only valid signal, and interference is inherently rejected (ignored).  
¾
FHSS (Frequency Hopping Spread Spectrum) - FHSS continuously changes (hops)  
the carrier frequency of a conventional carrier several times per second according to  
a pseudo-random set of channels. Because a fixed frequency is not used, and only  
the transmitter and receiver know the hop patterns, interception of FHSS is extremely  
difficult.  
¾
Infrastructure Network - An infrastructure network is a group of computers or other  
devices, each with a wireless adapter, connected as an 802.11 wireless LAN. In  
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TL-WN510G/TL-WN550G/TL-WN551G 54M Wireless Adapter User Guide  
infrastructure mode, the wireless devices communicate with each other and to a  
wired network by first going through an access point. An infrastructure wireless  
network connected to a wired network is referred to as a Basic Service Set (BSS). A  
set of two or more BSS in a single network is referred to as an Extended Service Set  
(ESS). Infrastructure mode is useful at a corporation scale, or when it is necessary to  
connect the wired and wireless networks.  
¾
Spread Spectrum - Spread Spectrum technology is a wideband radio frequency  
technique developed by the military for use in reliable, secure, mission-critical  
communications systems. It is designed to trade off bandwidth efficiency for reliability,  
integrity, and security. In other words, more bandwidth is consumed than in the case  
of narrowband transmission, but the trade off produces a signal that is, in effect,  
louder and thus easier to detect, provided that the receiver knows the parameters of  
the spread-spectrum signal being broadcast. If a receiver is not tuned to the right  
frequency, a spread-spectrum signal looks like background noise. There are two  
main alternatives, Direct Sequence Spread Spectrum (DSSS) and Frequency  
Hopping Spread Spectrum (FHSS).  
¾
SSID - A Service Set Identification is a thirty-two character (maximum) alphanumeric  
key identifying a wireless local area network. For the wireless devices in a network to  
communicate with each other, all devices must be configured with the same SSID.  
This is typically the configuration parameter for a wireless PC card. It corresponds to  
the ESSID in the wireless Access Point and to the wireless network name. See also  
Wireless Network Name and ESSID.  
¾
¾
WEP (Wired Equivalent Privacy) - A data privacy mechanism based on a 64-bit or  
128-bit or 152-bit shared key algorithm, as described in the IEEE 802.11 standard.  
Wi-Fi - A trade name for the 802.11b wireless networking standard, given by the  
industry standards group promoting interoperability among 802.11b devices.  
¾
¾
WLAN (Wireless Local Area Network) - A group of computers and associated  
devices communicate with each other wirelessly, which network serving users are  
limited in a local area.  
WPA (Wi-Fi Protected Access) - A wireless security protocol use TKIP (Temporal  
Key Integrity Protocol) encryption, which can be used in conjunction with a RADIUS  
server.  
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TL-WN510G/TL-WN550G/TL-WN551G 54M Wireless Adapter User Guide  
Appendix C: Contact Information  
For help with the Installation or operation of the TP-LINK TL-WN510G/TL-WN550G/  
TL-WN551G 54M Wireless Adapter, please contact us.  
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