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					Access Point


    IEEE 802.11
Principais Aplicações
Padrões IEEE 802.11

   802.11a   5GHz, 54Mbps
   802.11b   2.4GHz, 11Mbps
   802.11c   Protocolo para bridges
   802.11d   World Mode (Europa 20 dB, EUA-BR 36dB
   802.11e   Qualidade de Serviço
   802.11f   Inter-Access Point Protocol
   802.11g   2.4GHz, 54Mbps, modulação digital OFDM
   802.11h   Seleção dinâmica de frequência
   802.11i   Autenticação e Segurança
Access Point

   Short for Access Point, a hardware device or
    a computer's software that acts as a
    communication hub for users of a wireless
    device to connect to a wired LAN.

   APs are important for providing heightened
    wireless security and for extending the
    physical range of service a wireless user has
    access to.
Infrastructure Mode

    An 802.11 networking framework in which devices
    communicate with each other by first going through
    an Access Point (AP).

   In infrastructure mode, wireless devices can
    communicate with each other or can communicate
    with a wired network.

   When one AP is connected to wired network and a
    set of wireless stations it is referred to as a Basic
    Service Set (BSS).
Infrastructure Mode

   An Extended Service Set (ESS) is a set of
    two or more BSSs that form a single
    subnetwork.

   Most corporate wireless LANs operate in
    infrastructure mode because they require
    access to the wired LAN in order to use
    services such as file servers or printers.
Ad-hoc Mode

   An 802.11 networking framework in which devices
    or stations communicate directly with each other,
    without the use of an access point (AP).

   Ad-hoc mode is also referred to as peer-to-peer
    mode or an Independent Basic Service Set (IBSS).

   Ad-hoc mode is useful for establishing a network
    where wireless infrastructure does not exist or
    where services are not required.
802.11

   802.11 refers to a family of specifications
    developed by the IEEE for wireless LAN
    technology.

   802.11 specifies an over-the-air interface
    between a wireless client and a base station
    or between two wireless clients.

   The IEEE accepted the specification in 1997.
Specifications in the 802.11 family –
802.11 e 802.11a
   802.11 -- applies to wireless LANs and provides 1
    or 2 Mbps transmission in the 2.4 GHz band using
    either frequency hopping spread spectrum (FHSS)
    or direct sequence spread spectrum (DSSS).

   802.11a -- an extension to 802.11 that applies to
    wireless LANs and provides up to 54 Mbps in the
    5GHz band. 802.11a uses an orthogonal frequency
    division multiplexing encoding scheme rather than
    FHSS or DSSS.
802.11b


   802.11b (also referred to as 802.11 High
    Rate or Wi-Fi) -- an extension to 802.11 that
    applies to wireless LANS and provides 11
    Mbps transmission (with 2 and 1 Mbps)
    in the 2.4 GHz band.
802.11b


   802.11b uses only DSSS.

   802.11b was a 1999 ratification to the original
    802.11 standard, allowing wireless
    functionality comparable to Ethernet.
Access Point

   Short for Access Point, a hardware device or
    a computer's software that acts as a
    communication hub for users of a wireless
    device to connect to a wired LAN.

   APs are important for providing heightened
    wireless security and for extending the
    physical range of service a wireless user has
    access to.
Infrastructure Mode

    An 802.11 networking framework in which devices
    communicate with each other by first going through
    an Access Point (AP).

   In infrastructure mode, wireless devices can
    communicate with each other or can communicate
    with a wired network.

   When one AP is connected to wired network and a
    set of wireless stations it is referred to as a Basic
    Service Set (BSS).
Infrastructure Mode

   An Extended Service Set (ESS) is a set of
    two or more BSSs that form a single
    subnetwork.

   Most corporate wireless LANs operate in
    infrastructure mode because they require
    access to the wired LAN in order to use
    services such as file servers or printers.
Ad-hoc Mode

   An 802.11 networking framework in which devices
    or stations communicate directly with each other,
    without the use of an access point (AP).

   Ad-hoc mode is also referred to as peer-to-peer
    mode or an Independent Basic Service Set (IBSS).

   Ad-hoc mode is useful for establishing a network
    where wireless infrastructure does not exist or
    where services are not required.
802.11

   802.11 refers to a family of specifications
    developed by the IEEE for wireless LAN
    technology.

   802.11 specifies an over-the-air interface
    between a wireless client and a base station
    or between two wireless clients.

   The IEEE accepted the specification in 1997.
Specifications in the 802.11 family –
802.11 e 802.11a
   802.11 -- applies to wireless LANs and provides 1
    or 2 Mbps transmission in the 2.4 GHz band using
    either frequency hopping spread spectrum (FHSS)
    or direct sequence spread spectrum (DSSS).

   802.11a -- an extension to 802.11 that applies to
    wireless LANs and provides up to 54 Mbps in the
    5GHz band. 802.11a uses an orthogonal frequency
    division multiplexing encoding scheme rather than
    FHSS or DSSS.
802.11b

   802.11b (also referred to as 802.11 High
    Rate or Wi-Fi) -- an extension to 802.11 that
    applies to wireless LANS and provides 11
    Mbps transmission (with a fallback to 5.5, 2
    and 1 Mbps) in the 2.4 GHz band.

   802.11b uses only DSSS. 802.11b was a
    1999 ratification to the original 802.11
    standard, allowing wireless functionality
    comparable to Ethernet.
802.11b (Wi-Fi)
   Data Rate: Up to 11Mbps in the 2.4GHz band
   Modulation scheme: DSSS with CCK
   Security: WEP & WPA

   Products that adhere to this standard are considered "Wi-Fi
    Certified." Not interoperable with 802.11a. Requires fewer access
    points than 802.11a for coverage of large areas.

   Offers high-speed access to data at up to 300 feet from base
    station.

   14 channels available in the 2.4GHz band (only 11 of which can
    be used in the U.S. due to FCC regulations) with only three non-
    overlapping channels.
IEEE 802.11g

   Data Rate: Up to 54Mbps in the 2.4GHz band
   Modulation Scheme:
     OFDM above 20Mbps, DSSS with CCK below
     20Mbps WEP & WPA.
   Security: WEP & WPA

   Pros/Cons & More Info:
    Products that adhere to this standard are considered "Wi-Fi
    Certified." May replace 802.11b. Improved security
    enhancements over 802.11. Compatible with 802.11b. 14
    channels available in the 2.4GHz band (only 11 of which can be
    used in the U.S. due to FCC regulations) with only three non-
    overlapping channels.
IEEE 802.16 (WiMAX)

   Specifies WiMAX in the 10 to 66 GHz range.
   OFDM
   DES3 and AES
   Commonly referred to as WiMAX or less
    commonly as WirelessMAN or the Air
    Interface Standard,
   IEEE 802.16 is a specification for fixed
    broadband wireless metropolitan access
    networks (MANs).
IEEE 802.16a (Wi-MAX)

   Added support for the 2 to 11 GHz range.
   OFDM
   DES3 and AES
   Commonly referred to as WiMAX or less
    commonly as WirelessMAN or the Air
    Interface Standard,
   IEEE 802.16 is a specification for fixed
    broadband wireless metropolitan access
    networks (MANs).
Bluetooth

   Up to 2Mbps in the 2.45GHz band.
   FHSS.
   PPTP, SSL or VPN.
   No native support for IP, so it does not
    support TCP/IP and wireless LAN
    applications well.
   Not originally created to support wireless
    LANs. Best suited for connecting PDAs, cell
    phones and PCs in short intervals.
OFDM

   Short for Orthogonal Frequency Division
    Multiplexing, an FDM modulation technique for
    transmitting large amounts of digital data over a
    radio wave.
   OFDM works by splitting the radio signal into
    multiple smaller sub-signals that are then
    transmitted simultaneously at different frequencies
    to the receiver.
   OFDM reduces the amount of crosstalk in signal
    transmissions. 802.11a WLAN, 802.16 and WiMAX
    technologies use OFDM.
FHSS

   Acronym for frequency-hopping spread
    spectrum. FHSS is one of two types of spread
    spectrum radio, the other being direct-sequence
    spread spectrum.

   FHSS is a transmission technology used in WLAN
    transmissions where the data signal is modulated
    with a narrowband carrier signal that "hops" in a
    random but predictable sequence from
    frequency to frequency as a function of time
    over a wide band of frequencies.
FHSS

   The signal energy is spread in time domain rather
    than chopping each bit into small pieces in the
    frequency domain.

   This technique reduces interference because a
    signal from a narrowband system will only affect the
    spread spectrum signal if both are transmitting at the
    same frequency at the same time.

   If synchronized properly, a single logical channel is
    maintained.
FHSS

   The transmission frequencies are determined by a spreading, or
    hopping, code.

   The receiver must be set to the same hopping code and must
    listen to the incoming signal at the right time and correct
    frequency in order to properly receive the signal.

   Current FCC regulations require manufacturers to use 75 or
    more frequencies per transmission channel with a maximum
    dwell time (the time spent at a particular frequency during any
    single hop) of 400 ms.
DSSS
   Acronym for direct-sequence spread spectrum.
   DSSS is one of two types of spread spectrum radio, the other being
    frequency-hopping spread spectrum.

   DSSS is a transmission technology used in WLAN transmissions
    where a data signal at the sending station is combined with a higher
    data rate bit sequence, or chipping code, that divides the user data
    according to a spreading ratio.

   The chipping code is a redundant bit pattern for each bit that is
    transmitted, which increases the signal's resistance to interference.

   If one or more bits in the pattern are damaged during transmission,
    the original data can be recovered due to the redundancy of the
    transmission.
CCK - Complementary Code Keying

   Short for Complementary Code Keying, a
    set of 64 eight-bit code words used to encode
    data for 5.5 and 11Mbps data rates in the
    2.4GHz band of 802.11b wireless networking.
   The code words have unique mathematical
    properties that allow them to be correctly
    distinguished from one another by a receiver
    even in the presence of substantial noise and
    multipath interference.
CCK - Complementary Code Keying

   CCK works only in conjunction with the DSSS
    technology that is specified in the original 802.11
    standard.
   It does not work with FHSS.
   CCK applies sophisticated mathematical formulas to
    the DSSS codes, permitting the codes to represent
    a greater volume of information per clock cycle.
   The transmitter can then send multiple bits of
    information with each DSSS code, enough to make
    possible the 11Mbps of data rather than the 2Mbps
    in the original standard.
CSMA/CA

   Short for Carrier Sense Multiple
    Access/Collision Avoidance, a network
    contention protocol that listens to a network
    in order to avoid collisions.

   Unlike CSMA/CD that deals with network
    transmissions once collisions have been
    detected.
CSMA/CA

   CSMA/CA contributes to network traffic
    because, before any real data is transmitted,
    it has to broadcast a signal onto the network
    in order to listen for collision scenarios and to
    tell other devices not to broadcast.
L-G700AP > High Speed 2.4GHz
(802.11g) Wireless Access Point
L-G700AP > High Speed 2.4GHz
(802.11g) Wireless Access Point
   Product Features:

   Up to 54Mbps*

   WPA for Enhanced Wireless Security

   Quickly Add Wireless Access to Your Network

   Web-based Configuration and Management
Product Features:

   DWL-2100AP > High Speed 2.4GHz
    (802.11g) Wireless 108Mbps Access Point


   Up to 108Mbps*
   WPA & 802.1x Authentication
   SNMP Management Software Included
   Also Work as Point-To-Point Bridge, Point-to-
    Multipoint Bridge, Repeater, Wireless Client.
Wireless G USB Adapter
Wireless G USB Adapter

   Easily Connect to Your Wireless Network
    from Your Desktop or Notebook PC

   Works with 802.11g and 802.11b Wireless
    Networks

   Check E-mail, Surf the Web, and Chat with
    Friends and Family Online
DWL-G122 > High Speed 2.4GHz
(802.11g) Wireless USB Adapter
DWL-G122 > High Speed 2.4GHz
(802.11g) Wireless USB Adapter

   Product Features:
   Up to 54Mbps*
   802.11g Standard, 802.11b Compatible
   Protect Your Network with WPA and 802.1x
    Security
   Quick and Easy Setup
DI-524 > High Speed 2.4GHz
(802.11g) Wireless Router
DI-524 > High Speed 2.4GHz
(802.11g) Wireless Router

   Product Features:

       Up to 54Mbps*
       Advanced Firewall & Parental Control
       Quick and Easy Setup
       802.11g Standard, 802.11b Compatible
WNA-1330 > Wireless G Notebook
Adapter
WNA-1330 > Wireless G Notebook
Adapter
   Product Features:

       Easily Connect to Your Wireless Network from
        Your Notebook PC.
       Works with 802.11g and 802.11b Wireless
        Networks.
       Check E-mail, Surf the Web, and Chat with
        Friends and Family Online.
DSL-2640B > ADSL2/2+ Modem
with Wireless Router
DSL-2640B > ADSL2/2+ Modem
with Wireless Router
   Product Features:

       Supports The Latest ADSL Standards for Superior
        Performance.
       Access a High-Speed DSL Connection and Share
        The Internet.
       Connect Multiple Computers and Share Files -
        Wired or Wirelessly.
WDA-1320 > Wireless G Desktop
Adapter
WDA-1320 > Wireless G Desktop
Adapter

   Product Features:

       Easily Connect to Your Wireless Network from
        Your Desktop PC.
       Works with 802.11g and 802.11b Wireless
        Networks.
       Check E-mail, Surf the Web, and Chat with
        Friends and Family Online.
 DWL-G510 > High Speed 2.4GHz
(802.11g) Wireless PCI Adapter
DWL-G510 > High Speed 2.4GHz
(802.11g) Wireless PCI Adapter

   Product Features:

       Up to 54Mbps*.
       802.11g Standard, 802.11b Compatible.
       Great for Video Streaming.
       Increased Security with 802.1x and WPA**
 DWL-G630 > High Speed 2.4GHz
(802.11g) Wireless Cardbus Adapter
DWL-G630 > High Speed 2.4GHz
(802.11g) Wireless Cardbus Adapter

   Product Features:

       Up to 54Mbps*
       Great for Video Streaming
       802.11g Standard, 802.11b Compatible
       Increased Wireless Security with WPA and
        802.1x**.
DP-G310 > Wireless G USB Print
Server
DP-G310 > Wireless G USB Print
Server

   Product Features:

       Supports USB 2.0
       802.11g Standard, 802.11b Compatible
       Easy Web-based Set up and Configuration
DNS-G120 > Wireless G Network
Storage Adapter
DNS-G120 > Wireless G Network
Storage Adapter
   Product Features:

   Wirelessly Connect USB Storage to the
    Network.
   Built-in FTP Server** for Accessing Files over
    the Internet.
   Use Your Existing USB Drives Without
    Reformatting
DVG-G1402S > Wireless Broadband
VoIP Router
DVG-G1402S > Wireless Broadband
VoIP Router
   Product Features:

   802.11g Wireless Connectivity.
   Connect Up To 2 VoIP Lines.
   Integrated QoS To Prevent Dropped Calls
    And Deliver Superior Voice Quality.
DIR-330 > Wireless G Firewall/VPN
8 Router, 4-port Switch
DIR-330 > Wireless G Firewall/VPN
8 Router, 4-port Switch
   Product Features:
   Share a High-Speed Internet Connection.
   Support and Manage up to 8 VPN
    Configurations.
   Simple-to-Deploy Routing, VPN, and Firewall
    Solution.
   Enterprise-Class Security Protects Your
    Network from Online Intruders and Potential
    Attacks.
DPG-2100 > Wireless Presentation
Gateway
DPG-2100 > Wireless Presentation
Gateway
   Product Features:

   Quickly Switch between Presenters Using
    Separate Computers.
   Works with 802.11g and 802.11b Wireless
    Enabled PCs to Deliver Your Presentation.
   Connect to Your Projectorby cable.
DBT-120 > Wireless Bluetooth 2.0
USB Adapter
DBT-120 > Wireless Bluetooth 2.0
USB Adapter
   Product Features:

       Sync Data between Your Bluetooth PDA, Mobile
        Phone, and PC.
       Secure Encyption for Enhanced Network
        Protection.
       Experience The Convenience of Bluetooth
        Headphones, Cameras and Keyboards.
       Works with PC & Mac2.
AnyCom Bluetooth Access Point


   The ANYCOM EDR-AP Bluetooth is an
    access point for professional applications.

   It enables mobile devices equipped with
    Bluetooth technology like mobile phones,
    PDAs or PCs to connect wirelessly to local
    networks and the Internet.
AnyCom Bluetooth Access Point

   The ANYCOM EDR-AP is equipped with the
    latest Bluetooth 2.0 Standard including the
    Enhanced-Data-Rate (EDR) specification.

   This allows data transmission rates up to 1, 2
    MB/s and several mobile users to connect to
    it simultaneously without delay.
AnyCom Bluetooth Access Point


   As a class 1 device the covering range is up
    to 300 feet (100 meter) but the beaming
    power can be reduced for special
    applications.
AnyCom Bluetooth Access Point

   Extensive Security and Management-
    Functionalities like DHCP, SNMP and Radius
    Server suits the ANYCOM EDR-AP access
    point also into complex network
    environments.

   With the PPPoE protocol the ANYCOM EDR-
    AP can also be used as ADSL gateway.
AnyCom Bluetooth Access Point


   The ANYCOM EDR-AP on embedded Linux
    operating system, with Flash memory for
    easy software upgrades, and built-in Web
    server and Web interface for quick
    installation, and remote configuration and
    management.

				
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