hướng dẫn cài đặt pass cho wireless

... The data will be passed back to the wireless server provider gateway, and then back to the handheld device Wireless application Server must be device and network independent: The wireless application ... Gateway CDMA Gateway Ardis Gateway GSM Gateway 3- Wireless Middleware (Application server engine) Wireless application is the focal point of the wireless system This is where the flow of data is ... business opportunities in wireless banking and trading Resistance to the implementation of wireless banking can lead to major losses at the business and market share levels Wireless service soon

Ngày tải lên: 26/10/2013, 16:15

... Impact of wireless environment on networks ■ The wireless spectrum ■ Frequency Hopping Spread Spectrum ■ Direct Sequence Spread Spectrum Trang 4Agenda (2)● Wireless networks ■ Mobile wireless ... networks ■ Mobile wireless WANs ■ Fixed wireless WANs ■ WLANs: the 802.11 family Trang 5Impact of Wireless Environment Trang 7Wireless Spectrum (2)3G Broadband Wireless • 746-794 MHz, 1.7-1.85 GHz, ... chip rate (BW) Spurious Signals Trang 24Wireless Networks● Mobile wireless WANs ● Fixed wireless WANs ● WLANs: the 802.11 family Trang 25Generations in Mobile Wireless Service■ Seamless integration

Ngày tải lên: 29/10/2013, 06:15

... hiểu Wireless LAN và vấn đề bảo mật Wireless LAN GVHD: TS – Hồ Văn Canh SVTH: Vũ Thị Dung 1 LỜI CẢM ƠN Trước tiên em xin gửi lời cảm ơn sâu sắc tới thầy, TS. Hồ Văn Canh, đã tận tình hướng dẫn,giúp ... 89 Tìm hiểu Wireless LAN và vấn đề bảo mật Wireless LAN GVHD: TS – Hồ Văn Canh SVTH: Vũ Thị Dung 4 LỜI MỞ ĐẦU Sự tiến bộ của nền khoa học công nghệ thông tin đã góp phần làm cho đời sống xã ... tổng quan về WLAN Tìm hiểu Wireless LAN và vấn đề bảo mật Wireless LAN GVHD: TS – Hồ Văn Canh SVTH: Vũ Thị Dung 5 Chƣơng 2: Các vấn đề kĩ thuật Chƣơng 3: Bảo mật cho WLAN Trong quá trình làm,

Ngày tải lên: 10/12/2013, 14:30

... Course► Basics of wireless communication ► Evolution of modern wireless communication systems ► Wireless Networks ► Research issues in emerging wireless networks ► Adequate knowledge of wireless networks ... Trang 1Wireless NetworksLecture 1 Introduction to Wireless Communication Dr Ghalib A Shah Trang 2Data Communication and Networks1 Wireless Communication and Networks, 2 nd Ed., W Stalling. 2 Wireless ... domains of wireless networks Trang 4Course Syllabus Introduction to wireless communication  Evolution of wireless communication systems  Medium access techniques Trang 5Introduction to Wireless

Ngày tải lên: 05/07/2022, 13:04

... exceed the Trang 37 Wireless Transmission ► Why baseband signal can not be transmitted? ► Need bandpass signals whose minimum frequency is higher than 0 ► Modulator produces bandpass by superomposing ... Trang 1Wireless NetworksLecture 2 Introduction to Wireless Communication Dr Ghalib A Shah Trang 3Last Lecture ReviewTrang 4Trans ... information onto the carrier  In an RF system a modulator generates this information signal  Then it is passed to the transmitter and out the antenna Trang 11 Then at the other end the signal is demodulated

Ngày tải lên: 05/07/2022, 13:05

... Trang 1Wireless NetworksLecture 8 Evolution of Wireless Networks Dr Ghalib A Shah Trang 2 Review of previous lecture #7 1G wireless cellular networks ► NMT ► AMPS ... Hoping ► Direct Sequence Trang 4Evolution of Wireless Systems The worldwide success of cellular telephone has lead to the development of newer wireless systems and standards for other types ... there were multiple systems Three standards, TZ-801, TZ-802, and TZ-803 Trang 6Evolution Tree of Wireless SystemsTrang 7 First fully-automatic cellular phone system ► Started in 1970, in service

Ngày tải lên: 05/07/2022, 13:07

... Trang 1Wireless NetworksLecture 9 Evolution of Wireless Networks (Part II) Dr Ghalib A Shah Trang 2Outlines  Review of last ... IS-95B ► UMTS/W-CDMA ► CDMA2000  Summary of today’s lecture Trang 3Review of last lecture #8 1G wireless cellular networks ► NMT ► AMPS ► TACS  2G cellular systems ► GSM ► IS-136 ► PDC ► IS-95 ... service (GPRS) ► Enhanced Data rates for GSM Evolution (EDGE)  IS-95B upgrade for IS-95 Trang 6Wireless Networks Upgrade Paths IS-95 GSM IS-136 &PDC Cdma2000-1xRTT Cdma2000-1xEV DVDO Cdma2000-3xRTT

Ngày tải lên: 05/07/2022, 13:07

... Trang 1Wireless NetworksLecture 26 Wireless LAN / IEEE 802.11 Dr Ghalib A Shah Trang 3Standardization of Wireless Networks Wireless networks are standardized by ... Mobile Station (MS) in BSS with no connection to other BSSs form Independent BSS (IBSS). Trang 9Wireless LAN / IEEE 802.11Trang 10ESSTrang 11 Access Point functions as a bridge and a relay point. ... (DCF) DCF sub layer uses CSMA algorithm  Collision detection as in Ethernet is not possible in wireless comm.  It implements collision avoidance (CA) algorithm.  It uses a set of delays of

Ngày tải lên: 05/07/2022, 13:17

... Trang 1Wireless Networks Lecture 31 Wireless Mesh Networks Dr Ghalib A Shah Trang 2 Critical factors influencing performance► Radio techniques, scalability, QoS, security, Ease of Trang 4 Wireless ... existing wireless networks such as cellular, WSN, WiMAX etc  WMN is dynamically self-organized and self-configured Trang 5 Conventional nodes e.g PC, PDA, PocketPC, phones , equipped with wireless ... other wireless networks allow end-users access to WMN Trang 10 Dependence of power-consumption constraints on the type of mesh nodes.  Compatibility and interoperability with existing wireless

Ngày tải lên: 05/07/2022, 13:24

... Trang 1Wireless NetworksLecture 32 Wireless Mesh Networks Part II Dr Ghalib A Shah Trang 2► Routing – Cross-layer design ... MAC protocols solve partial problems power consumption etc.  Some Mesh routers integrate various wireless networking technologies and require advance bridging functions  Existing research focuses ... Layer WMN will be tightly coupled with internet and IP has been widely accepted in different wireless networks.  However routing differs from IP and cellular Trang 16 Finds and maintains

Ngày tải lên: 05/07/2022, 13:24

... underestimated bandwidth in wireless networks  Round Trip Time (RTT): ► The wireless media exhibits longer latencies due to long distances or NLOS path ► Large variation in RTT in wireless networks  ... acknowledged Trang 99Trang 10Issues in Heterogeneous Wireless Networks  Bit Error Rate (BER): ► 10 or worse are possible upon change in wireless environment  Bandwidth ► Very less as compared ... Trang 1Wireless Networks Lecture 33 TCP Over Wireless Networks Dr Ghalib A Shah Trang 2► Fast Retransmit/Recovery (TCP Reno)►

Ngày tải lên: 05/07/2022, 13:24

... Trang 1Wireless NetworksLecture 34 Wireless Sensor Networks Part I Dr Ghalib A Shah Trang 2 Introduction to WSN  Applications ... Retransmit/Recovery (TCP Reno)  Issues in Heterogeneous Wireless Networks ► BER, Bandwidth, variable RTT, Mobility, Power  TCP Schemes for Wireless ► Revolve around distinguishing congestion loss, ... application software by providing a convenient and safe abstraction of hardware resources  Wireless sensor networks (WSNs) are embedded but general-purpose, supporting a variety of applications,

Ngày tải lên: 05/07/2022, 13:24

... Trang 1Wireless Networks Lecture 39 Bluetooth/Wireless Personal Area Networks (WPAN) Dr Ghalib A Shah Trang 4What is Bluetooth? “Bluetooth wireless technology is ► an ... ► an open specification for a ► low-cost, low-power, short-range radio technology ► for ad-hoc wireless communication of ► voice and data anywhere in the world.” Trang 55Ultimate HeadsetTrang ... in range Trang 8Overview of Bluetooth History What is Bluetooth? ► Bluetooth is a short-range wireless communications technology.  Why this name? ► It was taken from the 10th century Danish

Ngày tải lên: 05/07/2022, 13:26

... xuất cho mạng Sensor 41 2.3.2 Giải pháp truy nhập môi trờng truyền dẫn 46 2.3.2.1 Yêu cầu với giao thức điều khiển truy nhập môi trờng (MAC) cho mạng sensor 46 2.3.2.2 Các giao thức MAC cho mạng ... nhiều vấn đề đặt ra cho mạng Wireless Sensor nh vấn đề năng lợng, vấn đề đồng bộ sensor, vấn đề mở rộng mạng Năng lợng luôn là yếu tố quan trọng của tất cả cácloại mạng Với mạng Wireless Sensor ... Wireless Sensor 2 - Chơng II : Năng lợng trong mạng Wireless Sensor 3 - Chơng III : Phần mềm mô phỏng cho mạng Wireless Sensor 4 - Chơng IV: Mô phỏng mạng Wireless Sensor Do còn hạn chế về kiến thức

Ngày tải lên: 25/08/2012, 14:01

... Trang 1Wireless CommunicationsIntroduction to Wireless Communications Trang 2• Explain the advantages and disadvantages of wireless communications technology • List several different wireless ... 3How Wireless Technology is Used• Wireless – Describes devices and technologies that are not connected by a wire • Wireless communications – Transmission of user data without the use of wires • Wireless ... Bluetooth – Wireless LAN and WAN – Satellite – Cellular Trang 4A Wireless World• Wireless devices – Distance: 300 feet (90 meters) – Bandwidth: 54 Mbps – Can also include Voice over IP (VoIP) • Wireless

Ngày tải lên: 13/09/2012, 10:52

... Trang 1Wireless CommunicationsRadio Frequency Identification Trang 2• Define Radio Frequency Identification ... the tags Trang 7RFID System Components (continued)• RFID tags (continued) – Basic types of tags • Passive tags (most common type) – They are small, can be produced in large quantities at low cost, ... Smart labels (continued) • Can be read regardless of their position or orientation – 1-bit tags • Passive devices used in retail stores • Do not contain a unique identification code, a chip, or

Ngày tải lên: 13/09/2012, 10:52

... Trang 1Wireless CommunicationsLow Rate Wireless Personal Area Networks Trang 2• Describe a wireless personal area network (WPAN) • List the different ... Bluetooth Special Interest Group (SIG) • Defines small-form-factor, low-cost wireless radio communications • IEEE licensed this wireless technology – To adapt and copy a portion of the specification ... ZigBee work • Describe the security features of low-rate WPAN technology Trang 3What is a WPAN?• Wireless personal area network (WPAN) – Group of technologies that are designed for short-range

Ngày tải lên: 13/09/2012, 10:52

... Wireless Communications Wireless Local Area Networks Objectives • Describe how WLANs are used • List the components and modes of a WLAN WLAN Applications • Wireless networks ... is inconvenient and very expensive – Wireless networks solve this problem • With a wireless network – Multiple users can share a single Internet connection • Wireless residential gateway – Device ... and wireless access point – Also allows Internet and printer sharing WLAN Components • Minimal hardware needed for a WLAN – – – – Computer ISP Wireless network interface card Access point (AP) Wireless

Ngày tải lên: 13/09/2012, 10:52

... Trang 1Wireless CommunicationsWireless Metropolitan Area Networks Trang 2• Explain why wireless metropolitan area networks (WMANs) are needed ... including FSO, LMDS, MMDS, and 802.16 (WiMAX) Trang 3What is a WMAN?• Wireless metropolitan area networks (WMANs) – Provide wireless connectivity across a substantial geographical area such as ... Mile Wired Connections (continued) Trang 6Last Mile Wired Connections (continued) Trang 7Last Mile Wireless Connections• Microwaves are higher frequency RF waves – In the 3 to 30 GHz range of the

Ngày tải lên: 13/09/2012, 10:52

... Trang 1Wireless CommunicationsWireless Wide Area Networks Trang 2• Describe wireless wide area networks (WWANs) and how they are used • Describe ... software – To operate on a wireless digital cellular device • Common types of clients – WAP – i-mode – Java – BREW Trang 22Wireless Application Protocol (WAP and WAP Version 2) • Wireless Application ... Internet text-only data • WAP cell phone runs a microbrowser – Uses Wireless Markup Language (WML) instead of HTML Trang 23Wireless Application Protocol (WAP and WAP Version 2) (continued)Trang

Ngày tải lên: 13/09/2012, 10:52