X Micro Technology XWL-11GUAR X-Micro WLAN 11g USB Adapter (108Mbps) User Manual USB

X-Micro Technology Corp., X-Micro WLAN 11g USB Adapter (108Mbps) USB

Manual

WLAN 11g USB Adapter        User Manual      ver 1.0
    Federal Communication Commission Interference Statement This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules.    These limits are designed to provide  reasonable  protection  against  harmful  interference  in  a  residential installation.  This  equipment  generates,  uses  and  can  radiate  radio  frequency energy and, if not installed and used in accordance with the instructions, may cause  harmful  interference  to  radio  communications.    However,  there  is  no guarantee  that  interference  will  not  occur  in  a  particular  installation.    If  this equipment  does  cause  harmful  interference  to  radio  or  television  reception, which  can  be  determined  by  turning  the  equipment  off  and  on,  the  user  is encouraged to try to correct the interference by one of the following measures:  -  Reorient or relocate the receiving antenna. -  Increase the separation between the equipment and receiver. -  Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. -  Consult the dealer or an experienced radio/TV technician for help. FCC  Caution: Any  changes  or  modifications  not  expressly  approved  by  the party responsible for compliance could void the user's authority to operate this equipment. This device  complies  with  Part 15 of  the FCC Rules. Operation  is subject  to the following  two  conditions:  (1)  This  device  may  not  cause  harmful  interference, and  (2)  this  device  must  accept  any  interference  received,  including interference that may cause undesired operation.  IMPORTANT NOTE: Radiation Exposure Statement: This  equipment  complies  with  FCC  radiation  exposure  limits  set  forth  for  an uncontrolled  environment.  End  users  must  follow  the  specific  operating instructions for satisfying RF exposure compliance. To maintain compliance with FCC RF exposure compliance requirements, please follow operation instruction as documented in this manual.   This  transmitter  must  not  be  co-located  or  operating  in  conjunction  with  any other antenna or transmitter. SAR compliance has been established in typical laptop computer(s) with USB slot, and  product  could  be  used  in  typical  laptop  computer  with  USB  slot.  Other application  like handheld PC  or  similar  device  has  not  been  verified  and may not compliance with related RF exposure rule and such use shall be prohibited.
    The availability of some specific channels and/or operational frequency bands are country dependent and are firmware programmed at the factory to match the intended destination. The firmware setting is not accessible by the end user.  Europe – EU Declaration of Conformity This  device  complies  with  the  essential  requirements  of  the  R&TTE  Directive 1999/5/EC.  The  following  test  methods  have  been  applied  in  order  to  prove presumption of conformity with the essential requirements of the R&TTE Directive 1999/5/EC:  EN 60 950-1: 2001 +A11: 2004 Safety of Information Technology Equipment EN 50371: 2002 Generic standard to demonstrate the compliance of low power electronic and electrical  apparatus  with  the  basic  restrictions  related  to  human  exposure  to electromagnetic fields (10 MHz - 300 GHz) -- General public EN 300 328 V1.6.1 (2004-11) Electromagnetic  compatibility  and  Radio  spectrum  Matters  (ERM);  Wideband transmission systems; Data transmission equipment operating in the 2,4 GHz ISM band  and  using  wide  band  modulation  techniques;  Harmonized  EN  covering essential requirements under article 3.2 of the R&TTE Directive EN 301 489-1 V1.6.1: (2005-09) Electromagnetic  compatibility  and  Radio  Spectrum  Matters  (ERM); ElectroMagnetic Compatibility (EMC) standard for radio equipment and services; Part 1: Common technical requirements EN 301 489-17 V1.2.1 (2002-08)   Electromagnetic  compatibility  and  Radio  spectrum  Matters  (ERM); ElectroMagnetic Compatibility (EMC) standard for radio equipment and services; Part 17: Specific conditions for 2,4 GHz wideband transmission systems and 5 GHz high performance RLAN equipment  This device is a 2.4 GHz wideband transmission system (transceiver), intended for use in all EU member states and EFTA countries, except in France and Italy where restrictive use applies.  In  Italy  the  end-user  should  apply  for  a  license  at  the  national  spectrum authorities  in  order  to  obtain  authorization  to  use  the  device  for  setting  up outdoor  radio  links  and/or  for  supplying  public  access  to  telecommunications
    and/or network services.  This device may not be used for setting up outdoor radio links in France and in some areas the RF output power may be limited to 10 mW EIRP in the frequency range  of  2454  –  2483.5  MHz.  For  detailed  information  the  end-user  should contact the national spectrum authority in France.  0560  Česky [Czech] [Jméno výrobce] tímto prohlašuje, že tento [typ zařízení] je ve shodě se základními požadavky a dalšími příslušnými ustanoveními směrnice 1999/5/ES. Dansk [Danish] Undertegnede [fabrikantens navn] erklærer herved, at følgende udstyr [udstyrets typebetegnelse] overholder de væsentlige krav og øvrige relevante krav i direktiv 1999/5/EF. Deutsch [German] Hiermit erklärt [Name des Herstellers], dass sich das Gerät [Gerätetyp] in Übereinstimmung mit den grundlegenden Anforderungen und den übrigen einschlägigen Bestimmungen der Richtlinie 1999/5/EG befindet. Eesti [Estonian] Käesolevaga kinnitab [tootja nimi = name of manufacturer] seadme [seadme tüüp = type of equipment] vastavust direktiivi 1999/5/EÜ põhinõuetele ja nimetatud direktiivist tulenevatele teistele asjakohastele sätetele. English  Hereby, [name of manufacturer], declares that this [type of equipment] is in compliance with the essential requirements and other relevant provisions of Directive 1999/5/EC. Español [Spanish] Por medio de la presente [nombre del fabricante] declara que el [clase de equipo] cumple con los requisitos esenciales y cualesquiera otras disposiciones aplicables o exigibles de la Directiva 1999/5/CE. Ελληνική [Greek] ΜΕ ΤΗΝ ΠΑΡΟΥΣΑ [name of manufacturer] ∆ΗΛΩΝΕΙ ΟΤΙ [type of equipment] ΣΥΜΜΟΡΦΩΝΕΤΑΙ ΠΡΟΣ ΤΙΣ ΟΥΣΙΩ∆ΕΙΣ ΑΠΑΙΤΗΣΕΙΣ ΚΑΙ ΤΙΣ ΛΟΙΠΕΣ ΣΧΕΤΙΚΕΣ ∆ΙΑΤΑΞΕΙΣ ΤΗΣ Ο∆ΗΓΙΑΣ 1999/5/ΕΚ. Français [French] Par la présente [nom du fabricant] déclare que l'appareil [type d'appareil] est conforme aux exigences essentielles et aux autres dispositions pertinentes de la directive 1999/5/CE. Italiano [Italian] Con la presente [nome del costruttore] dichiara che questo [tipo di apparecchio] è conforme ai requisiti essenziali ed alle altre disposizioni pertinenti stabilite dalla direttiva 1999/5/CE. Latviski  Ar šo [name of manufacturer   / izgatavotāja nosaukums] deklarē, ka [type of equipment /
    [Latvian]  iekārtas tips] atbilst Direktīvas 1999/5/EK būtiskajām prasībām un citiem ar to saistītajiem noteikumiem. Lietuvių [Lithuanian]   Šiuo [manufacturer name] deklaruoja, kad šis [equipment type] atitinka esminius reikalavimus ir kitas 1999/5/EB Direktyvos nuostatas. Nederlands [Dutch] Hierbij verklaart [naam van de fabrikant] dat het toestel [type van toestel] in overeenstemming is met de essentiële eisen en de andere relevante bepalingen van richtlijn 1999/5/EG. Malti [Maltese] Hawnhekk, [isem tal-manifattur], jiddikjara li dan [il-mudel tal-prodott] jikkonforma mal-ħtiġijiet essenzjali u ma provvedimenti oħrajn relevanti li hemm fid-Dirrettiva 1999/5/EC. Magyar [Hungarian] Alulírott, [gyártó neve] nyilatkozom, hogy a [... típus] megfelel a vonatkozó alapvetõ követelményeknek és az 1999/5/EC irányelv egyéb elõírásainak. Polski [Polish] Niniejszym [nazwa producenta] oświadcza, że [nazwa wyrobu] jest zgodny z zasadniczymi wymogami oraz pozostałymi stosownymi postanowieniami Dyrektywy 1999/5/EC. Português [Portuguese] [Nome do fabricante] declara que este [tipo de equipamento] está conforme com os requisitos essenciais e outras disposições da Directiva 1999/5/CE. Slovensko [Slovenian] [Ime proizvajalca] izjavlja, da je ta [tip opreme] v skladu z bistvenimi zahtevami in ostalimi relevantnimi določili direktive 1999/5/ES. Slovensky [Slovak] [Meno výrobcu] týmto vyhlasuje, že [typ zariadenia] spĺňa základné požiadavky a všetky príslušné ustanovenia Smernice 1999/5/ES. Suomi [Finnish] [Valmistaja = manufacturer] vakuuttaa täten että [type of equipment = laitteen tyyppimerkintä] tyyppinen laite on direktiivin 1999/5/EY oleellisten vaatimusten ja sitä koskevien direktiivin muiden ehtojen mukainen. Svenska [Swedish] Härmed intygar [företag] att denna [utrustningstyp] står I överensstämmelse med de väsentliga egenskapskrav och övriga relevanta bestämmelser som framgår av direktiv 1999/5/EG.
    Contents  1. Introduction ...............................................................................................1 1.1  Product Feature................................................................................1 1.2  System Requirement ........................................................................1 2. Getting Start...............................................................................................2 2.1  LED Indicators..................................................................................2 2.2  Install the 108Mbps Wireless Network USB Dongle .........................2 2.2.1  Utility Installation....................................................................2 2.2.2  Driver Installation ...................................................................6 3. Configuration..............................................................................................10 3.1 Link Information...................................................................................10 3.2 Configuration.......................................................................................11 3.3 Advanced.............................................................................................12 3.4 Site Survey..........................................................................................14 3.5 About US .............................................................................................15 4. Glossary......................................................................................................16
 1 1. Introduction  1.1 Product Feature ●  Compliance with IEEE802.11g and 802.11b standards ●  Highly efficient design mechanism to provide unbeatable performance ●  Achieving data rate up to 54Mbps for 802.11g and 11Mps for 802.11b with wide range coverage ●  Strong network security with WEP,WPA and WPA-PSK support ●  Auto-switch between the two standards, IEEE 802.11b and 802.11g ●  Driver/Utility support most commonly used operating systems including   Windows 2000/XP.     ●  Pen  size  which  is  easy  to  carry  provides  users  the  most  mobility  and flexibility. ●  Support USB 2.0 and USB 1.1 at the same time, especially for USB 2.0 the data rate reaches 480MBytes.    1.2 System Requirement ●  Windows 2000 and XP operating systems ●  PC with Pentium III 600MHz system or above is recommended ●  Equipped with at least one PC USB socket or PC USB adapter, USB 2.0 at least. ●  One CD-ROM drive
 2 2. Getting Start  2.1 LED Indicators The Power LED will be ON when the unit is powered up. The Link LED will be Blinking indicates a WLAN connection.  2.2 Install the 108Mbps Wireless Network USB Dongle 2.2.1  Utility Installation 1.  Before insert USB Dongle into the PC USB of your computer, please install the Utility Program first.    Make sure that the  108Mbps Wireless Network USB Dongle is NOT inserted into the USB slot.   NOTE: all the snapped images of installation mentioned in this manual are based  on  Windows  XP.    For  other  windows  operating  system,  all  the procedures are the same but the screens are not the exactly same.
 3 2.  Turn  on  the  computer.    Insert  the  CD  into  the  CD-ROM  Drive.    Please select “USB Dongle” and then click the “Install”.    3.  InstallShield  Wizard  will  automatically  start.    Please  click  “Next”  to continue.
 4 If user wants to change the installation folder, press “Brower” to change the directory or press “Next” to continue.
 5 4.  Click “Finish” to finish the installation.
 6 5.  Restart computer to make the settings effective.   2.2.2  Driver Installation 1.  After  restarting  the  computer,  insert  the  USB  dongle  into  USB  port.  Few seconds later, there will be a window popup as the following picture.
 7 2.  Click “Continue Anyway” to keep installation going.   3.  Click “Finish” to finish the driver of USB installation.
 8 4. After installing the driver of USB, there will be another pop-up window as the following picture to guide you to keep installing the driver of USB Dongle.     5. Click “Continue Anyway” to keep installation going.
 9 6. Click “Finish” to finish the driver of USB Dongle installation.   7. To make sure if the installation is successful, you could check it through the device management.    8.  Once the installation is successful, a utility program icon will show on your desktop.    To lunch the utility, just double click the icon.
 10 3. Configuration 3.1 Link Information The default page is as below after you launch the Utility program.  Status: Shows the SSID associated, 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 for communication to be established. 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. Tx Rate: Shows the current data rate used for transmitting. Channel: Shows the current channel for communication. Link  Quality:  Shows  the  link  quality  of  the  108Mbps Wireless  Network  USB Dongle with the Access Point when operating under Infrastructure mode. Signal Strength: Shows the wireless signal strength of the connection between the 108Mbps Wireless Network USB Dongle with the Access Point. Data Rate: Shows the statistics of data transfer, and the calculation is based on the number of packets transmitted and received.
 11 3.2 Configuration This is the page where you can change the basic settings of the Access Point with  the  minimum  amount  of  effort  to  implement  a  secure  wireless  network environment.   SSID: Service Set Identifier, which is a unique name shared among all clients and nodes in a wireless network. The SSID must be identical for each clients and nodes in the wireless network. Wireless Mode: There are two types available for selection ●Infrastructure  –  to  establish  wireless  communication  with  LAN  and  other wireless clients through the use the Access Points. ●Ad-Hoc – to establish point-to-point wireless communication directly with other wireless client devices such as wireless network Adapter. AdHoc Band: There are four bands available for selection- 11B.11G and 11G Turbo Channel:  The  value  of  channel  that  AP  will  operate  in.  You  can  select  the channel  range  of  1  to  11  for  North  America  (FCC)  domain  and  1  to  13  for European (ETSI) domain and 1 to 14 for Japanese domain. Power Mode: There are 3 modes to choose. ●Continuous Access Mode (default) – the USB Dongle is constantly operating with full power and it consumes the most power.
 12 ●Maximum Power Save – the USB Dongle consumes the least power and only operates when there is wireless network activity. ●Power Save – the USB Dongle consumes the moderate level of power. Preamble: Select Long or Short Preamble type. Preamble is a sequence of bits transmitted  at  1Mbps  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  interoperates  with  the  1  Mbit/s  and  2  Mbit/s  DSSS specification (as described in IEEE Std 802.11), and an optional Short Preamble and header (as described in IEEE Std 802.11b). At the receiver, the Preamble and header are processed to aid in demodulation 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 communicate with stations implementing the original version of the protocol. Click “Apply” for the changes to take effect.    3.3 Advanced This is the page where you configure advanced settings of your 108Mbps Wireless Network USB Dongle
 13 Encryption: 4  options  are  available:  Disable,  Enable,  WPA  and  WPA-PSK.   Select Enable or Disable for WEP data encryption feature.    If one of the two options is selected, it is required to select the Authentication mode from the next dropping list.    If WPA is selected, configuration is enabled.    Please click the  “configuration”.  The  below  window  is  pop  up.  Then,  please  select  the certificate that user wants to use and enter the server name and login name  If WPA-PSK is selected, click the configuration button.    The popping window is as the below. Please enter the key.  Auth. Mode: There are three modes available to choose. Open Authentication – the sender and receiver do not share secret Key for communication. Instead, each party generates its own key-pairs and asks the other  party  to  accept  it.  The  key  is  regenerated  when  the  connection  is established every time. Shared Authentication – the sender and receiver shares the common key for data communication, and the key is used for extended length of time.
 14 Auto – depend on the communication to establish, and automatically use the proper authentication mode.  The following will only be activated to allow for configuration when Encryption is enabled. Default Key: select one of the 4 keys to use. Network Key: choose the encryption way, either in HEX or ASCII formats, and enter the password in the blank space.   Key Length: select 64 or 128 bits as the length of the keys Key Format: ASCII or HEX   3.4 Site Survey This page allows you to enable the Site Survey function to scan for the available wireless  network  (wireless  clients  and  Access  Points)  and  establish  wireless communications with one.   Available  Network  –  displays  the  wireless  networks  (wireless  clients  and Access Points) that are in your signal range.   Select  any  one  of  them  to  establish  communications  by  simply  mouse double-click or click on the “Connect” button. Click “Refresh” button to start scanning for available network again. Profile – You can create and manage the created profiles for Home, offices or public areas.    By double-clicking on one of the created profile, the setting will adapt to the configuration such as SSID, channel, and WEP settings saved by that particular profile.
 15 Remove: To remove the selected the profile Properties: To view and change its settings of the profile. Add: To add a profile. Then, the following screen would appear.  3.5 About US This page displays some information about the 108Mbps Wireless Network USB Dongle  utility,  which  includes  the  version  numbers  for  Driver,  Firmware  and Utility.    When there is new version of software available for upgrade, you will be able to identify by version numbers.
 16 4. Glossary Access Point: An internetworking device that seamlessly connects wired and wireless networks. Ad-Hoc: An independent wireless LAN network formed by a group of computers, each with a network adapter. AP Client: One of the additional AP operating modes offered by 54Mbps Access Point, which allows the Access Point to act as an Ethernet-to-Wireless Bridge, thus a LAN or a single computer station can join a wireless ESS network through it. ASCII: American Standard Code for Information Interchange, ASCII, is one of the  two  formats  that  you  can  use  for  entering  the  values  for  WEP  key.  It represents English letters as numbers from 0 to 127. Authentication Type:  Indication of an authentication  algorithm  which can be supported by the Access Point: 1. Open System: Open System authentication is the simplest of the available authentication algorithms.  Essentially it is a null authentication algorithm. Any station  that  requests  authentication  with  this  algorithm  may  become authenticated  if  802.11  Authentication  Type  at  the  recipient  station  is  set  to Open System authentication. 2. Shared Key: Shared Key authentication supports authentication of stations as either a member of those who knows a shared secret key or a member of those who does not. Backbone: The core infrastructure of a network, which transports information from one central location to another where the information is unloaded into a local system. Bandwidth: The transmission capacity of a device, which is calculated by how much data the device can transmit in a fixed amount of time expressed in bits per second (bps). Beacon:  A  beacon  is  a  packet  broadcast  by  the  Access  Point  to  keep  the network synchronized. Included in a beacon are information such as wireless LAN service area, the AP address, the Broadcast destination addresses, time stamp, Delivery Traffic Indicator Maps, and the Traffic Indicator Message (TIM).
 17 Bit: A binary digit, which is either -0 or -1 for value, is the smallest unit for data. Bridge: An internetworking function that incorporates the lowest 2 layers of the OSI network protocol model. Browser: An application program that enables one to read the content and interact in the World Wide Web or Intranet. BSS: BSS stands for “Basic Service Set”. It is an Access Point and all the LAN PCs that associated with it. Channel: The bandwidth which wireless Radio operates is divided into several segments,  which  we  call  them  “Channels”.  AP  and  the  client  stations  that  it associated work in one of the channels. CSMA/CA: In local area networking, this is the CSMA technique that combines slotted  time  -division  multiplexing  with  carrier  sense  multiple  access/collision detection (CSMA/CD) to avoid having collisions occur a second time. This works best if the time allocated is short compared to packet length and if the number of situations is small. CSMA/CD: Carrier Sense Multiple Access/Collision Detection, which is a LAN access method used in Ethernet. When a device wants to gain access to the network, it checks to see if the network is quiet (senses the carrier). If it is not, it waits a random amount of time before retrying. If the network is quiet and two devices access the line at exactly the same time, their signals collide. When the collision is detected, they both back off and wait a random amount of time before retrying. DHCP:  Dynamic  Host  Configuration  Protocol,  which  is  a  protocol  that  lets network administrators manage and allocate Internet Protocol (IP) addresses in a network.    Every computer has to have an IP address in order to communicate with each other in a TCP/IP based infrastructure network. Without DHCP, each computer  must  be  entered  in  manually  the  IP  address.  DHCP  enables  the network  administrators  to  assign  the  IP  from  a  central  location  and  each computer  receives  an  IP  address  upon  plugged  with  the  Ethernet  cable everywhere on the network.
 18 DSSS:  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. Dynamic IP Address: An IP address that is assigned automatically to a client station in a TCP/IP network by a DHCP server. Encryption: A security method that uses a specific algorithm to alter the data transmitted, thus prevent others from knowing the information transmitted. ESS: ESS stands for “Extended Service Set”. More than one BSS is configured to become Extended Service Set. LAN mobile users can roam between different BSSs in an ESS. ESSID: The unique identifier that identifies the ESS. In infrastructure association, the stations use the same ESSID as AP’s to get connected. Ethernet:  A  popular  local  area  data  communications  network,  originally developed  by  Xerox  Corp.,  that  accepts  transmission  from  computers  and terminals.    Ethernet operates on a 10/100 Mbps base transmission rate, using a shielded coaxial cable or over shielded twisted pair telephone wire. Fragmentation:  When  transmitting  a  packet  over  a  network  medium, sometimes  the  packet  is  broken  into  several  segments,  if  the  size  of  packet exceeds that allowed by the network medium. Fragmentation Threshold: The Fragmentation Threshold defines the number of  bytes  used  for  the  fragmentation  boundary  for  directed  messages.  The purpose of "Fragmentation Threshold" is to increase the transfer reliability thru cutting a MAC Service Data Unit (MSDU) into several MAC Protocol Data Units (MPDU) in smaller size. The RF transmission can not allow to transmit too big frame size due to the heavy interference caused by the big size of transmission frame. But if the frame size is too small, it will create the overhead during the transmission.
 19 Gateway:  a  device  that  interconnects  networks  with  different,  incompatible communication protocols. HEX: Hexadecimal, HEX, consists of numbers from 0 – 9 and letters from A – F. IEEE: The Institute of Electrical and Electronics Engineers, which is the largest technical professional society that promotes the development and application of electrotechnology  and  allied  sciences  for  the  benefit  of  humanity,  the advancement of the profession. The IEEE fosters the development of standards that often become national and international standards. Infrastructure: An infrastructure network is a wireless network or other small network in which the wireless network devices are made a part of the network through the Access Point which connects them to the rest of the network. ISM Band: The FCC and their counterparts outside of the U.S. have set aside bandwidth for unlicensed use in the ISM (Industrial, Scientific and Medical) band.   Spectrum  in  the  vicinity  of  2.4GHz,  in  particular,  is  being  made  available worldwide. MAC  Address:  Media  Access  Control  Address  is  a  unique  hex  number assigned  by  the  manufacturer  to  any  Ethernet  networking  device,  such  as  a network adapter, that allows the network to identify it at the hardware level. Multicasting: Sending data to a group of nodes instead of a single destination. Multiple Bridge – One of the additional AP operating modes offered by 54Mbps Access Point, which allows a group of APs that consists of two or more APs to connect  two or more  Ethernet networks  or Ethernet  enabled  clients  together. The way that multiple bridge setups is based on the topology of Ad-Hoc mode. Node:  A  network  junction  or  connection  point,  typically  a  computer  or workstation. Packet: A unit of data routed between an origin and a destination in a network. PLCP: Physical layer convergence protocol PPDU: PLCP protocol data unit
 20 Preamble Type: During transmission, the PSDU shall be appended to a PLCP preamble and header to create the PPDU. Two different preambles and headers are  defined  as  the  mandatory  supported  long  preamble  and  header  which interoperates with the current 1 and 2 Mbit/s DSSS specification as described in IEEE  Std  802.11-1999,  and  an  optional  short  preamble  and  header.  At  the receiver, the PLCP preamble and header are processed to aid in demodulation and delivery of the PSDU.    The optional short preamble and header is intended for application where maximum throughput is desired and interoperability with legacy and non-short-preamble capable equipment is not consideration. That is, it is expected to be used only in networks of like equipment that can all handle the optional mode. (IEEE 802.11b standard) PSDU: PLCP service data unit Roaming: A LAN mobile user moves around an ESS and enjoys a continuous connection to an Infrastructure network. RTS: Request To Send. An RS-232 signal sent from the transmitting station to the receiving station requesting permission to transmit. RTS Threshold: Transmitters contending for the medium may not be aware of each other. RTS/CTS mechanism can solve this “Hidden Node Problem”. If the packet  size  is  smaller  than  the  preset  RTS  Threshold  size,  the  RTS/CTS mechanism will NOT be enabled. SSID: Service Set Identifier, which is a unique name shared among all clients and nodes in a wireless network. The SSID must be identical for each clients and nodes in the wireless network. Subnet  Mask:  The  method  used  for  splitting  IP  networks  into  a  series  of sub-groups, or subnets. The mask is a binary pattern that is matched up with the IP address to turn part of the host ID address field into a field for subnets. TCP/IP:  Transmission  Control  Protocol/  Internet  Protocol.  The  basic communication language or protocol of the Internet. It can also be used as a communications protocol in a private network, i.e. intranet or internet. When you are set up with direct access to the Internet, your computer is provided with a copy of the TCP/IP program just as every other computer that you may send messages to or get information from also has a copy of TCP/IP.
 21 Throughput:  The  amount  of  data  transferred  successfully  from  one  point  to another in a given period of time. WEP: Wired Equivalent Privacy (WEP) is an encryption scheme used to protect wireless  data  communication.  To  enable  the  icon  will  prevent  other  stations without the same WEP key from linking with the AP. Wireless  Bridge  –  One  of  the  additional  AP  operating  modes  offered  by 54mpbs  Access  Point,  which  allows  a  pair  of  APs  to  act  as  the  bridge  that connects two Ethernet networks or Ethernet enabled clients together.
 22 Countries of Operation and Conditions of Use in the European Community  This  device  is  intended  to  be  operated  in  all  countries  of  the  European Community.    Requirements  for  indoor  vs.  outdoor  operation,  license requirements  and  allowed  channels  of  operation  apply  in  some  countries  as described in this document.  Note:   The  user  must  use  the  configuration  utility  provided  with  this product  to  check  the current channel  of operation  and  confirm that  the device  is  operating  in  conformance  with  the  spectrum  usage  rules  for European  Community  countries  as  described  below.      If  operation  is occurring outside of the allowable channels as indicated in this guide, then the user  must  cease  operating  the  product  and  consult  with  the  local  technical support staff responsible for the wireless network.
                   www.x-micro.com

Navigation menu