Planet Technology WL-3560 User's Manual
Contents
1. ab eerie A edad eed ates da le bead ee 10 3 2 CONFIGURATION ccccecccecceeeceeececccecceecececeeceeceeesueceeeaecsueceeesaeeaeecueesaes 11 3 3 ADVANCED 0 ccccceeceecccecceecceceneeceecaeecaeecuecanecceeceecsaeceecseeesueeaeeseeeseeseeeses 12 3 4 e A ove ee ete 13 esd tose cadence ocean Beato B a 13 2 2 1 12082000 14 Chapter 1 Introduction The WL 3560 is an IEEE 802 11g Wireless PCMCIA card that can operate in either Ad Hoc mode Point to Point Point to Multipoint without an Access Point or Infrastructure mode Point to Point Point to Multipoint with an Access Point With almost 5 times the data rate of tradi tional 802 11b products it is suitable for multimedia applications which require greater band width It operates in the 2 4GHz unlicensed ISM band and is compliant with both 802 11b and 802 110 standards This dual standard support allows for greater flexibility of deployment and use The WL 3560 supports both 64 128 bit WEP Wired Equivalent Privacy and Wi Fi Protected Access WPA for securing wireless network connections The driver and utility supports most popular operating systems Windows 98SE ME 2000 XP Server 2003 With advanced features and high performance capability the WL 8310 is an excellent choice for constructing a wide range of wireless solutions 1 1 Features2. Fully compliant with wireless LAN IEEE 802 119 and 802 11b standards Wireless connection without the difficulty and cost of cabling High performance with data rate up to 54 Mbps for 802 11g and 11Mbps for 802 11b Based on 2 4GHz Direct Sequence Spread Spectrum DSSS Technology Supports 64 128 bit WEP Wired Equivalent Privacy and Wi Fi Protected Access WPA Supports Ad Hoc Peer to Peer communication and Infrastructure mode with an Ac cess Point Seamless integration with IEEE 802 3 LAN through any IEEE 802 11b or 802 11g compliant Access Point Supports most popular operating systems including Windows 98 Me 2000 XP Server 2003 Low Interference and High Susceptibility Guarantee Reliable Performance Supports Power Save mode Plug and Play installation 1 2 Applications 1 2 1 Infrastructure The WL 3560 provides access to a wired LAN for wireless workstations An integrated wireless and wired LAN is called an Infrastructure configuration A group of WL 3560 PC users and an Access Point compose a Basic Service Set BSS Each WL 3560 PC ina BSS can talk to any computer in the wired LAN infrastructure via the Access Point An Infrastructure configuration extends the accessibility of a WL 3560 equipped PC to a wired LAN and doubles the effective wireless transmission range for 2 WL 3560 PCs Since the Access Point is able to forward data within its BSS the effective transmission range in an infrastructure LAN is
3. PLANET Networking amp Communication IEEE802 11g Wireless PCMCIA Card WL 3560 User Manual Copyright Copyright 2003 by PLANET Technology Corp All rights reserved No part of this publi cation may be reproduced transmitted transcribed stored in a retrieval system or trans lated into any language or computer language in any form or by any means electronic mechanical magnetic optical chemical manual or otherwise without the prior written per mission of PLANET PLANET makes no representations or warranties either expressed or implied with respect to the contents hereof and specifically disclaims any warranties merchantability or fitness for any particular purpose Any software described in this manual is sold or licensed as is Should the programs prove defective following their purchase the buyer and not PLANET its distributor or its dealer assumes the entire cost of all necessary servicing repair and any incidental or consequential damages resulting from any defect in the software Further PLANET reserves the right to revise this publication and to make changes from time to time in the contents hereof without obligation to notify any person of such revision or changes All brand and product names mentioned in this manual are trademarks and or registered trademarks of their respective holders Federal Communication Commission Interference Statement This equipment has been tested and found to comply with t
4. Shows the statistics of data transfer and the calculation is based on the number of packets transmitted and received 10 3 2 Configuration it Link Info 54Mbps Wireless LAN Adapter Configuration Utility X Configuration 5510 Wireless Wireless Mode Infrastructure si AdHoc Band ji Advanced jis Site Survey Channel Tx Rate 118 5 i About Power Mode Continuous Access Mode 71 Preamble Short amp Long Preamble si Applv Cancel 54Mbps Wireless LAN Adapter Configuration Utilitv In this screen vou can configure the wireless settings of WL 3560 After configuration please press Apply to save settings or Cancel to set again SSID The SSID must be identical for each clients and nodes the wireless network u Wireless Mode Click pull down button and select the work mode below Ad Hoc This mode indicates the peer to peer operation All communication is done from client to client without the use of an Access Point Infrastructure This operation mode requires the presence of an Access Point All communication is done via the Access Point u AdHoc Band There are two bands available for selection 11B Allows user to set the 802 11b standard wireless network 116 Allows user to set the 802 11g standard wireless network u Channel Shows the number of the radio channel used for the networking u Tx Rate 11B G Shows the Data Transfer Rate If Auto Mode is selected the de
5. will choose the driver to install Choose this option to select the device driver from a list Windows does not guarantee that the driver you choose will be the best match for your hardware mem 4 Adialogue box will pop up Click Continue Anyway to continue Hardware Installation The software you are installing for this hardware 54Mbps High Speed Wireless Network Adapter has not passed Windows Logo testing to verify its compatibility with Windows Tell me why this testing is important Continuing your installation of this software may impair or destabilize the correct operation of your system either immediately or in the future Microsoft strongly recommends that you stop this installation now and contact the hardware vendor for software that has passed Windows Logo testing Continue Anyway STOP Installation 5 Click Finish to complete the installation Found New Hardware Wizard Completing the Found New gt Hardware Wizard IS The wizard has finished installing the software for 54Mbps High Speed Wireless Network Adapter Click Finish to close the wizard lt Back Chapter 3 Configuration Utility The Configuration Utility is a powerful application that helps you to configure the WL 3560 and monitor the status of the communication process By double click the icon on the system tray the dialog box as below appears i Link Info 54Mbps Wirele
6. wireless application for mobile workers What is BSS ID A specific Ad Hoc LAN is called a Basic Service Set BSS Computers in a BSS must be configured with the same BSS ID What is Roaming Roaming is the ability of portable computers e g Packet PC and notebook to have consistent and continuous data transmission reception throughout an area covered by more than one Wireless Access Point In order to achieve seamless connectivity all the wireless clients and Access Points must be set to use the same SSID Whena user walked out of the coverage area of one AP into another the wireless client network device will automatically reestablish connection with the new AP What is a MAC Address The Media Access Control MAC address is a unique number assigned by the manu facturer to any Ethernet networking devices e g a network adapter that allows the network to identify it at the hardware level Unlike IP addresses which can be 14 changed or dynamically assigned by the network the MAC address of networking device is permanent What is WEP Wired Equivalent Privacy WEP is a type of data encryption mechanism described in the IEEE 802 11 standard Could implement the driver utility installations on another operating system e g Windows 98SE 2000 and ME Are there any differences of driver utility installa tions among these different operating systems Yes you can All the installation mentioned in this user s manual cou
7. Installation Note The following installation operates under Windows XP Procedures will be similar to other operating system 1 Insert WL 3560 to a vacant PCMCIA slot and turn on the computer 2 The Found New Hardware Wizard screen will appear Please select Install from a specific location Advanced option and click Next to continue Found New Hardware Wizard Welcome to the Found New gt Hardware Wizard This wizard helps you install software for Ethernet Controller 9 If your hardware came with an installation CD or floppy disk insert it now What do you want the wizard to do Click Next to continue lt Back Next gt Cancel 3 Insert Driver and User s Manual CD into CD ROM drive Select Include this location in the search and then click Browse to find out WL 3560 driver location to install driver Assume E is your CD ROM drive you can find out WL 3560 driver in E Drivers WL 8310 Please click Next to continue Found New Hardware Wizard Please choose your search and installation options GS Y Search for the best driver in these locations Use the check boxes below to limit or expand the default search which includes local paths and removable media The best driver found will be installed Search removable media floppy CD ROM Include this location in the search ESD rivers L 3560 Browse Don t search
8. doubled The use of a unique ID in a BSS is essential All WL 3560 equipped PCs configured without roaming options in an independent BSS must be configured with a BSS ID cor responding to the WL 3560 used in the BSS Check your WL 3560 for its BSS ID or use the Site Survey function on Configuration Utility program to determine the BSS ID The Infrastructure Wireless LAN configuration is appropriate for enterprise scale wire less access to a central database or as a wireless application for mobile users Infrastructure mode also supports roaming capabilities for mobile users More than one BSS can be configured as an Extended Service Set ESS The continuous network al lows users to roam freely within an ESS All WL 3560 PCs or other IEEE 802 11b and 802 11g compliant wireless adapters within one ESS must be configured with the same ESS ID and use the same radio channel Before enabling an ESS with roaming capability choosing a feasible radio channel and optimum Access Point position is recommended Proper Access Point positioning com bined with a clear radio signal will greatly enhance performance 1 2 2 Ad Hoc An Ad Hoc wireless LAN is a group of computers each equipped with one WL 3560 adapter or other wireless adapters connected as an independent wireless LAN Com puters in a specific Ad Hoc wireless LAN must be configured to share the same radio channel Ad Hoc wireless LAN configurations appropriate for branc
9. steps to complete the installation 2 1 Configuration Utility Installation Please install the configuration utility before insert WL 3560 into the PCMCIA slot of the computer 1 Insert the CD ROM into the CD ROM drive to initiate the autorun program Once completed a menu screen will appear as follows PLANET IEEE802 11g Wireless LAN Products Nenecteg Commencation About This CD ROM ECD_WLGv1 Cardbus PCMCIA WL 3560 WL 8310 PCI WL 3560 The WL 3560 User s Manual in POF format User s Manual Get Adobe Acrobat PDF Reader Configuration Install configuration utility and driver on Windows Utilit 38 Me 2000 XP WL 8310 a WL 8310 User s Manual in PDF format User s Manual Get Adobe Acrobat PDF Reader Configuration Install configuration utility and driver on Windows Utility 38 Me 2000 XP Software to help vou browse this CD ROM Adobe Acrobat PDF Reader 2 Click on Configuration Utility hyper link in WL 3560 field to initiate the installation If the above screen is not shown can click the Start button and choose When the box appears enter E Utility WL 3560 setup exe Suppose E is your CD ROM drive You will see the dialog box as the picture Please click Next to con tinue Welcome to the InstallShield Wizard for 54Mbps Wireless LAN Adapter The InstallShieldR Wizard will install 5AMbps Wireless LAN Adapter on your computer
10. To continue click Next 3 You can click Browse to specify the Destination Folder that you want to install the configuration utility Or you can keep the default setting and click Next to continue 54Mbps Win Choose Destination Location Select folder where Setup will install files Setup will install 54Mbps Wireless LAN Adapter in the following folder To install to this folder click Next To install to a different folder click Browse and select another folder Destination Folder C Program Files 54Mbps Wireless LAN Adapter Browse InstallShield 4 Select the program folder you want to install this utility to Or you can keep the default setting and click Next to continue ss LAN Adapter Setup Select Program Folder Please select program folder Setup will add program icons to the Program Folder listed below You may type new folder name or select one from the existing folders list Click Next to continue Avance Sound Manager IF View Microsoft Office PLANET WL U351 PowerQuest PartitionMagic 8 0 SiS 650_651_M650_740 SNMPc Network Manager gt InstallShield 5 Click Finish to complete the installation procedures InstallShield Wizard Complete The InstallShield Wizard has successfully installed 54Mbps Wireless LAN Adapter Click Finish to exit the wizard Cancel 2 2 Windows 98 2000 2003 Driver
11. Windows 98 Me 2000 XP Server 2003 PC with CD ROM driver One vacant PCMCIA slot 1 6 SAFETY PRECAUTION Only use the accessories attached with the device package Otherwise the device may not function If you miss or damage the accessories please contact your local dealer 1 7 Installation Considerations Please keep the number of walls and ceilings between the Access Point and clients as less as possible Each wall or ceiling can reduce your wireless cover range form 3 90 feet Position your Access points Residential Gateways and computers so that the number of walls or ceilings is minimized Building materials make a difference A solid metal door or aluminum studs may negative effect on range Try to position Access Points and computers with wireless adapters so that the signal passes through drywall or open doorways and not other ma terials Keep the wireless product away form electrical devices or appliances at least 3 6 foot which may generate extreme RF noise Chapter 2 Installation Procedure Before you proceed with the installation it is necessary that you have enough information about the Wireless PCMCIA Card Use the Procedure described below to install the card under Windows 98 Me 2000 XP Server 2003 Note If you ever install the other Wireless Card before please uninstall the existed driver and utility first If this is the first time to install this device please refer to the following
12. d 64bit SASCII 10HEX 128bit 13ASCII 26HEX or 256bit 29ASCII 58HEX u Kev Format Vou can select WEP kev format to Hexadecimal code 0 9 A F or ASCII American Standard Code for Information Interchange 0 9 2 2 3 4 Site Survev ie Link Info 54Mbps Wireless LAN Adapter Configuration Utility X Available Network BSS IBSSID 5510 AP Channel Refresh 00 11 22 33 44 56 Wireless 1 i 00 30 4 28 63 AP28639A No Yes 6 if Configuration ji Advanced li Site Survey if About Profile Wireless Properties 54Mbps Wireless LAN Adapter Configuration Utility This screen shows the APs or Adapters which available fro WL 3560 to connect If you con figure the SSID of WL 3560 as it will show the available APs and Adapters at the same time Click Refresh to collect the BSSID and Channel information of all the wireless devices around you If you wish to connect to any device on the Available Network list select the device on the list and click Connect then WL 3560 will connect to the selected device and create a profile for the selected device automatically You can configure profile with those buttons y Add a new profile y Remove Delete the profile you selected y Properties Modify the profile you selected After press Add or Properties the dialog box will appears f
13. dth 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 pro vided 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
14. e with Frequency channel restrictions Germany Greece Ireland Italy Luxembourg The Netherlands Portugal Spain Sweden and United Kingdom The ETSI version of this device is also authorized for use in EFTA member states Iceland Liechtenstein Norway and Switzerland Potential restrictive use France Only channels 10 11 12 and 13 Revision User s Manual for PLANET IEEE802 11g Wireless PCMCIA Card Model WL 3560 Rev 1 0 July 2003 Part No EM WL3560V1 Manual Contents CHAPTER 1 1 5 2 a TEE 1 1 2 6 0 0 1 0 100 21 EEI EE nnirnnzrzzznnzznnzzznznnzzznzzzzz 2 Ws 3S PECIFIGATION 4 1 4 PACKAGE 4 4 6 0000 4 1 5 MINIMUM SYSTEM REQUIREMENTS 0 0 0 3 6 4 1 6 SAFETY 0 0 5 1 7 INSTALLATION CONSIDERATIONS 0 066 5 CHAPTER 2 INSTALLATION PROCEDURE 6 2 1 CONFIGURATION UTILITY INSTALLATION 6 2 2 WINDOWS 98 ME 2000 XP SERVER 2003 DRIVER 8 CHAPTER CONFIGURATION UTILITV 10
15. ference and 2 this Device must accept any interference received including interference that may cause undesired operation Federal Communication Commission FCC Radiation Exposure State ment This equipment complies with FCC radiation exposure set forth for an uncontrolled envi ronment In order to avoid the possibility of exceeding the FCC radio frequency exposure limits human proximity to the antenna shall not be less than 20 cm 8 inches during normal operation R amp TTE Compliance Statement This equipment complies with all the requirements of DIRECTIVE 1999 5 CE OF THE EUROPEAN PARLIAMENT AND THE COUNCIL OF 9 March 1999 on radio equipment and telecommunication terminal Equipment and the mutual recognition of their conformity R amp TTE The R amp TTE Directive repeals and replaces in the directive 98 13 EEC Telecommunications Terminal Equipment and Satellite Earth Station Equipment As of April 8 2000 Safety This equipment is designed with the utmost care for the safety of those who install and use it However special attention must be paid to the dangers of electric shock and static electricity when working with electrical equipment All guidelines of this and of the computer manu facture must therefore be allowed at all times to ensure the safe use of the equipment EU Countries Not Intended for Use The ETSI version of this device is intended for home and office use in Austria Belgium Denmark Finland Franc
16. h level departments or SOHO operations 1 2 3 General Application WL 3560 offers a fast reliable cost effective solution for wireless client access to the network in applications like these 1 Remote access to corporate network information E mail file transfer and terminal emulation 2 Difficult to wire environments Historical or old buildings asbestos installations and open area where wiring is diffi cult to employ 3 Frequently changing environments Retailers manufacturers and banks who frequently rearrange the workplace and change location 4 Temporary LANs for special projects or peak time Trade shows exhibitions and construction sites need temporary setup for a short time period Retailers airline and shipping companies need additional workstations for a peak period Auditors require workgroups at customer sites 5 Access to database for mobile workers Doctors nurses retailers white collar workers need access to database while being mobile in the hospital retail store or office campus 6 SOHO Small Office and Home Office users SOHO users need easy and quick installation of a small computer network 7 High security connection The wireless security network installs quickly and provides the flexibility to reconfigure easily 1 3 Specification Product Model Name Attachment Interface IEEE802 11g Wireless Card WL 3560 PC CardBus 32 bit compliant LED Indicators Two Link Act Operati
17. he limits for a Class B digital de vice pursuant to Part 15 of 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 1 Reorient or relocate the receiving antenna 2 Increase the separation between the equipment and receiver 3 Connect the equipment into an outlet on a circuit different from that to which the re ceiver is connected 4 Consult the dealer or an experienced radio technician for help FCC Caution To assure continued compliance example use only shielded interface cables when con necting to computer or peripheral devices Any changes or modifications not expressly ap proved by the party responsible for compliance could void the user s authority to operate the equipment 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 inter
18. ld be implemented on Windows 98SE ME 200 XP and there will be no difference Can Wireless products support printer sharing Wireless products perform the same function as LAN products Therefore Wireless products can work with Netware Windows NT 2000 XP or other LAN operating sys tems to support printer or file sharing What is DSSS What is FHSS And what are their differences Frequency hopping spread spectrum FHSS uses a narrowband carrier that changes frequency in a pattern that is known to both transmitter and receiver Properly synchro nized the net effect is to maintain a single logical channel To an unintended receiver FHSS appears to be short duration impulse noise Direct sequence spread spectrum DSSS generates a redundant bit pattern for each bit to be transmitted This bit pattern is called a chip or chipping code The longer the chip the greater the probability that the original data can be recovered Even if one or more bits in the chip are damaged during transmission statistical techniques embedded in the radio 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 What is Spread Spectrum Spread Spectrum technology is a wideband radio frequency technique developed by the military for use in reliable secure mission critical communication systems It is de signed to trade off bandwi
19. ng Frequency Channel 2 412 2 462GHz FCC USA amp Canada 11 Channels 2 412 2 4835GHz TELEC Japan 14 Channels 2 412 2 472GHz ETSI Europe 13 Channels RF Modulation Direct Sequence Spread Spectrum DSSS Technology OFDM CCK QPSK BPSK RF Output Power 16dBm typical 802 119 66dBm PER lt 8 54 Mbps sensitivity 802 11b 82dBm PER lt 8 11 Mbps 802 11g 54 48 36 24 18 12 9 6 Mbps with auto rate fall Data Rate back 802 11b 11 5 5 2 1 Mbps with auto rate fall back Media Access Protocol CSMA CA ACK Antenna Built in patch antenna Working Mode Ad Hoc Infrastructure Dimension mm 119 x 54 x 12 mm Humidity 0 95 non condensing Operating and storage Temperature 0 55 degree C Operating 10 70 degree Storage Compatibility Windows 98SE ME 2000 XP Server 2003 Management Utility or Windows XP built in management interface Electromagnetic Compatibil ity 1 4 Package Contents FCC Part 15 class B CE Mark ETS 300 328 Before installation please check the items of your package The package should include the following items WL 3560 xi Quick Installation Guide x1 Drivers and User s Manual CD xi If anv of the above items are missing contact vour supplier as soon as possible 1 5 Minimum Svstem Requirements Before installation please check the following requirements with vour equipment Operating System
20. or configuring profile You can refer to above to know how to configure the setting for your need 3 5 About It shows the current Driver Firmware and Utility version 13 This section provides some technology Q amp A Read the description below to know more about the wireless network What is the difference between 54Mbps and 11Mbps wireless products What s the benefit of 54Mbps Wireless Access Point The 54Mbps is made possible by the new modulation method called OFDM which is different from the current CCK modulation method for 11Mbps The 54Mbps wireless products also operate in the 2 4GHz ISM band and they are backward compatible with 11Mbps wireless products What is ISM band The FCC and their counterparts outside of the U S have set aside bandwidth for unli censed use in the ISM Industrial Scientific and Medical band The 2 4GHz unlicensed ISM band is available worldwide which presents the opportunity for the global market of 802 11b and 802 11g high speed wireless products What is Ad Hoc An Ad Hoc integrated wireless LAN is a group of computers each with a WLAN adapter Connected as an independent wireless LAN Ad Hoc wireless LAN is applicable at a departmental scale for a branch or SOHO operation What is Infrastructure An integrated wireless and wired LAN is called an Infrastructure configuration Infra structure is applicable to enterprise scale for wireless access to central database or
21. ration Encryption Disable il Auth Mode Auto z Default Network Key Key Length Al 4 bits ii About 2 3 B4bits 71 4 ea bits z Default Key if Site Survey Key Format Cancel 54Mbps Wireless LAN Adapter Configuration Utility Additional security can be achieved by using the WEP Wired Equivalent Privacy encryption WEP encrypts each frame transmitted from the radio using one of the keys entered from this panel u u Encryption Enable or disable WEP encryption Auth Mode y Open Authentication With this setting the station in the WLAN can receives and transmits data from Access Point null authentication y Shared Authentication With this setting allows communication only with other devices with identical WEP settings Auto Switch With this setting stations can communicate with the Access Point either with or without data encryption It will detect the AP that it connected is using which Authentication mode and use the same mode to communicate WEP Key options Default Key There 4 keys available for the WEP function Please select of them for WEP to operate Network Key You can define the WEP Wired Equivalent Privacy Key values by yourself Key Length Please select which WEP key mode you want to use There are 12 three modes each mode has two kind of key length and that is decide on the Key Format you selecte
22. ss LAN Adapter Configuration Utility if Configuration Status Associated BSSID 00 11 22034455 SSID it Advanced Frequency Wireless mastucu 245252222220 i Site Survey Encryption 4404 495 0 Tx Rate on Mbps n it About Channel Rescan j Link Quality Signal Strength Link Quality 62 Signal Strength 100 Data Rate Transmit 2 Kbps 16820 0 Kbps 54Mbps Wireless LAN Adapter Configuration Utility This utility can be used to modify the configuration parameters when the device is active Following details the configuration options 3 1 Link Info This screen contains current link information of WL 3560 Status Shows the BSSID associated with which can be used to identify the wireless network SSID Shows current SSID which must be the same for the wireless client and AP in order to establish the communication Frequency Shows the current frequency used for wireless network Wireless Mode Shows the current wireless mode used for wireless communication Encryption Shows the current encryption mode used for wireless network TxRate Shows the current data rate used for transmitting Channel Shows the current channel for communication Link Quality Shows the link quality of WL 3560 with the Access Point when operating in Infrastructure mode Signal Strength Shows the wireless signal strength of the connection between the WL 3560 and the Access Point Data Rate
23. vice will choose the best transfer rate automatically u Power Mode Shows Power Management modes There are two optional selections for this mode y Continuous Access Mode WL 3560 will always set in active mode y Maximum Power Save WL 3560 will enter power saving mode when it is idle Power Save WL 3560 consumes the moderate level of power u Preamble There is two options can be selected Short 8 Long Preamble Long Pream ble Preamble is a sequence of bits transmitted at 1 Mbps that allows the PHY circuitry to reach steady state demodulation and synchronization of bit clock and frame start Two different preambles and headers are defined the mandatory supported Long Preamble and header which interoperate with the 1 Mbit s and 2 Mbit s DSSS specification as described in IEEE 802 11 and an optional Short Preamble and header as described in 11 IEEE 802 11b At the receiver the Preamble and header are processed to aid de modulation and delivery of the PSDU The Short Preamble and header may be used to minimize overhead and thus maximize the network data throughput However the Short Preamble is supported only from the IEEE 802 11b High Rate standard and not from the original IEEE 802 11 That means that stations using Short Preamble cannot com municate with stations implementing the original version of the protocol 3 3 Advanced i Link Info 54Mbps Wireless LAN Adapter Configuration Utility X if Configu
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