Wi-Fi Hardware. Abdus Salam ICTP, February 2004 School on Digital Radio Communications for Research and Training in Developing Countries
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1 Wi-Fi Hardware Abdus Salam ICTP, February 2004 School on Digital Radio Communications for Research and Training in Developing Countries Ermanno Pietrosemoli Latin American Networking School (Fundación EsLaRed) ULA Mérida Venezuela 2/16/04 Pietrosemoli 1
2 Wi-Fi Technology Overview Agenda Review HW choices HW configuration Addenda to the Standards Software Tools 2/16/04 Pietrosemoli 2
3 2/16/04 Pietrosemoli 3
4 General Layout 2/16/04 Pietrosemoli 4
5 2/16/04 Pietrosemoli 5
6 What it s available FUNDACITE LAN (NOC) 9.15 Km Commercial Products: Access points Canagua PA 5.2 Km COR Aguada Norte PA Residential Gateways LAN Switch/Hub PA Enterprises Gateways PC router (OS Linux) Km COR Pico Espejo Bridges 3.66 Km Canagua Link PA PA COR Paramo del Motor Pietrosemoli 29 COR Central Outdoor Router ROR Remote Outdoor Router 2/16/04 Pietrosemoli 6
7 What it s available PA (500 mw) PC router (OS Linux) La Aguada ULA Wireless 2.4 GHz DSSS PMP (Ad doc) Peer to Peer Massini(ULA) Rectorado (ULA) DIY: Linux Box with wireless card Arquitectura (ULA) LAN PC Gateway (OS Linux) Arquitectura (ULA) PC Gateway (OS Linux) LAN PC Gateway (OS Linux) PA (500 mw) LAN Ingenieria (ULA) PC Gateway (OS Linux) LAN PC Gateway (OS Linux) LAN Pietrosemoli 30 Maximum flexibility: Bridge, Router, Firewall, Nat, DHCP Potential cost saving if recycling PCs Reliability concern Drivers Available for most cards Standalone low power PCs available Easy implementation of Mesh topology Complexity of install and maintenance 2/16/04 Pietrosemoli 7
8 Hardware List Antenna Antenna Cable and Connectors Lightning Arrestor Pigtail Wireless Card + bus adapter Access Point? Amplifier? 2/16/04 Pietrosemoli 8
9 2/16/04 Pietrosemoli 9
10 Client Devices 2/16/04 Pietrosemoli 10
11 Client Devices Wireless Flash Combo (128MB) Portable Wireless b USB Storage Device Dimension: 93 x 30 x 15 mm (L x W x H Weight: 30 g $ /16/04 Pietrosemoli 11
12 b / 2.4GHz g / 2.4GHz 108Mbps 2/16/04 Pietrosemoli 12
13 2/16/04 Pietrosemoli 13
14 2/16/04 Pietrosemoli 14
15 2/16/04 Pietrosemoli 15
16 2/16/04 Pietrosemoli 16
17 2/16/04 Pietrosemoli 17
18 Configuration Parameters Avaya Wireless PC-Card used in client station and AP-1000 or AP-500 Behaves differently based on the parent unit When inserted in AP-1000 or AP-500, AP firmware is downloaded into the PC-Card (Note: this is Avaya Wireless/MAC FW, not Bridge FW ) When inserted in client station, STA firmware is active (default FW) Requires different configuration parameter sets to support the different behavior Configuration can be performed by: Setting parameters at installation Changing parameters in property settings Using Avaya Wireless AP Manager (for APs)
19 Configuration Parameters Basic parameters (Station) Network Name (SSID) ASCII string to identify the network that the station wants to connect to (similar to Domain-ID in WLAN pre-ieee) Station Name (SSID) ASCII string to provide a user friendly station identification, when used in diagnostic purposes (in Windows systems: equal to computer name ) Type of Operation To identify the kind of network that the station will be part of Network centered around APs (or RG-1000)
20 Configuration Parameters Advanced parameters (Station) MAC Address Physical address of the card: Universal; factory installed (default) Local; user-defined (6 Hexadecimal characters) Distance between APs To specify the coverage of a cell in terms of the distance between the Access-Points Large Medium Small
21 Configuration Parameters Advanced parameters (Station) Microwave Oven Robustness Check box to enable/disable data-rate fallback delaymechanism to allow improved performance in presence of microwave ovens RTS/CTS Medium Reservation Check box to enable/disable the RTS/CTS handshake. Card Power Management Check box to enable/disable Power Management
22 Configuration Parameters Encryption parameters (Station) Enable Encryption To enable/disable Encryption Encryption keys Four fields to store up to four different encryption keys Entries take up to 5 ASCII or 10 hexa-decimal values (when using 64 WEP) Encryption key index Index identifying which of the four keys is the active one
23 Configuration Parameters Basic parameters (AP-500/1000) Network Name (SSID) ASCII string to identify the network that the Access- Point is part of (similar to Domain-ID in WaveLAN pre-ieee). Only available in Access Point mode. Frequency (channel) To indicate the frequency channel that the AP- 500/1000 will use for its cell. The channel is selected from the set that is allowed in the regulatory domain.
24 Addenda to the basic protocol a, b, g enhanced speed and multipath performance e Quality of Service d Additional regulatory domains h Spectrum Managed a I Security x Authentication 2/16/04 Pietrosemoli 24
25 Task Group H: Spectrum Managed a radios transmit and without getting appropriate feedback, halt and retransmit h overlays a to solve both interference and overuse problems, as well as improve coexistence with other specs that might reside on the same band. The h spec requires devices to check whether given frequencies are in use before transmitting (Dynamic Frequency Selection or DFS), as well as only transmitting at the minimum necessary power level (Transmit Power Control or TPC). 2/16/04 Pietrosemoli 25
26 Task Group H: Spectrum Managed a These additions were formulated specifically to meet requirements for using the 5 GHz band in the European Union, which has been promoting its own specification called HiperLAN2 There's a chance for spillover of h into other standards like b and g, of course, to improve their responsiveness 2/16/04 Pietrosemoli 26
27 Task Group E: Quality of Service Every packet has an equal chance of getting through in b. Task Group E wants to change that, allowing for what's known as "quality of service" or QoS, to guarantee that some packets have more priority than others. This is a fairly tricky task, involving coordination between client radios, access points, and system administrators. QoS is needed for consistent voice-quality calls using VOIP (voice over IP) and for streaming multimedia. 2/16/04 Pietrosemoli 27
28 Task Group 802.1x Is developing a method of authenticating users through a back-end system in a secure fashion. Some weaknesses in the approach have already been discovered, unfortunately, as there is a lot of room for man-in-the-middle style interception 2/16/04 Pietrosemoli 28
29 Wireless LAN Analysis- tools AiroPeek from WildPackets Grasshopper from BV Systems Mobile Manager from Wavelink Sniffer Wireless from Network Associates NetStumbler AirSnort via the SourceForge AirSnort has been designed to break WEP encryption keys. It operates by passively monitoring transmissions, and when enough interesting packets have been gathered, usually over a 24 hour period, it can then calculate the WEP key.. 2/16/04 Pietrosemoli 29
30 Questions? 2/16/04 Pietrosemoli 30
WiFi Overview. 2/14/2005 Pietrosemoli 1
WiFi Overview Abdus Salam ICTP, February 2005 Radio Based Computer Networking for Research and Training in Developing Countries Ermanno Pietrosemoli Latin American Networking School (Fundación EsLaRed)
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