benefits of wireless local area network

... wired network interface port ã AP functions Wireless communications base station Bridge between the wireless and wired networks 6 Wireless Network Interface Card (continued) 5 Wireless Network ... of wireless clients and an AP ã Extended Service Set (ESS) Two or more BSS wireless networks installed in same area – Provides users with uninterrupted mobile access to the network ã All wireless ... communicate among themselves Wireless Communications Wireless Local Area Networks 4 WLAN Components ã Minimal hardware needed for a WLAN Computer ISP Wireless network interface card Access...

Ngày tải lên: 13/09/2012, 10:52

Ngày tải lên: 01/09/2013, 10:30

... carrier is of a very narrow bandwidth, which means that its data rate is slow. Figure 9.10 shows the spectrum for an OFDM transmission. Wireless Local Area Networks 255 Figure 9.10 Detection of OFDM ... target of this group is to enhance the current 802.11 MAC to provide security improve- ments. 9.7 Summary In this chapter we cover the area of Wireless Local Area Networks by focusing on a number of ... requirement for every network, it is an even more Wireless Local Area Networks 245 Figure 9.5 Example of frequency reuse ẵ2 21I Ê ranfị Ê Slot_time, where i is the number of times the station...

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Ngày tải lên: 01/08/2014, 07:21

... HomogeneousPlaneWaves 53 3.1.4 InhomogeneousPlaneWaves 53 3.1.5 PhysicsofHomogeneousvs.InhomogeneousPlaneWaves 55 3.2 TheLocalArea 60 3.2.1 DefinitionofaLocalArea 60 3.2.2 ScattererProximity 60 3.2.3 AWidebandPlaneWave ... 3 discusses the basic form that a stochastic local area channel model must take. Great care is taken in defining a local area and a stochastic local area channel, clearly stating the assumptions ... ApplicationstoWirelessTechnology 187 vii THEORY OF STOCHASTIC LOCAL AREA CHANNEL MODELING FOR WIRELESS COMMUNICATIONS by Gregory D. Durgin Final Dissertation submitted to the Faculty of the Virginia Polytechnic...

Ngày tải lên: 20/11/2012, 11:36

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... using SIR ã Then they shift to FIR speed Wireless Communications Low Rate Wireless Personal Area Networks 2 Objectives ã Describe a wireless personal area network (WPAN) ã List the different WPAN ... and ZigBee work ã Describe the security features of low-rate WPAN technology 3 What is a WPAN? ã Wireless personal area network (WPAN) Group of technologies that are designed for short- range ... Security ã Security should be of little concern with WPANs ã One of the most serious concerns is social engineering ã Designing security in WPANs Much more difficult task than in other networking technologies ã Public...

Ngày tải lên: 13/09/2012, 10:52

... include a set of fields that are present in the same order in every frame Wireless# Guide to Wireless Communications 15 802.15.3 Network Topology (continued) Wireless# Guide to Wireless Communications ... corrected – Also called error correction (FEC) Wireless# Guide to Wireless Communications 26 Mesh Networking (802.15.5) (continued) Wireless# Guide to Wireless Communications 28 How UWB Works ã UWB ... division multiplexing (OFDM) ã Commonly referred to as MB-OFDM ã Frequency band is divided into five groups containing a total of 14 frequency bands Wireless# Guide to Wireless Communications...

Ngày tải lên: 13/09/2012, 10:52

... have a radius of up to 35 miles (56 kilometers) 2 Objectives ã Explain why wireless metropolitan area networks (WMANs) are needed ã Describe the components and modes of operation of a WMAN ã List ... a WMAN? ã Wireless metropolitan area networks (WMANs) Provide wireless connectivity across a substantial geographical area such as a large city ã WMANs primary goals Extend wired networks beyond ... same network ã WiMAX MAC layer makes it easy for carriers to deploy the network ã Range of a WiMAX network is measured in miles ã Cellular phone operators can easily incorporate WiMAX networks ...

Ngày tải lên: 13/09/2012, 10:52

... for a stationary user ã 3G network technologies CDMA2000 1xEVDO ã For 2.5G CDMA2000 1xRTT networks 25 Binary Runtime Environment for Wireless (BREW) ã BREW is a thin software environment Very ... (continued) ã Short Message Services (SMS) One of the most widely used applications – Allows for the delivery of short, text-based messages between wireless devices ã Messages are limited to about ... (2.5G) Interim step between 2G and 3G – Operates at a maximum speed of 384 Kbps – 2.5G networks are packet-switched Advantages of packet switching ã Much more efficient Can handle more transmissions...

Ngày tải lên: 13/09/2012, 10:52

... nhất được nhận dạng bởi thiết bị hai đầu. 5.4 CÔNG NGHỆ VLAN: VLAN là viết tắt của Virtual Local Area Network hay còn gọi là mạng LAN ảo. Một VLAN được định nghĩa là một nhóm logic các thiết ... hình native VLAN thì phải cấu hình ở giao diện vật lý. CHƯƠNG II LÝ THUYẾT VỀ MẠNG WAN (WIDE AREA NETWORK) I. KHÁI NIỆM : Là mạng được thiết lập để liên kết các máy tính của hai hay nhiều khu ... trí rất xa nhau, ví dụ như những quốc gia khác nhau, thì khi đó ta có mạng diện rộng WAN(Wide Area Network) Trang NGUYỄN ĐÌNH CÔNG – 36CLTH 2929 V./. CÁC CÔNG NGHỆ MẠNG LAN : 5.1. CÔNG NGHỆ CHUYỂN...

Ngày tải lên: 25/04/2013, 11:58

... Trunking: Off, Encapsulation type: Unknown SwitchA#show trunk b DISL state: Off, Trunking: Off, Encapsulation type: Unknown SwitchA# Note that "Off" is the default DISL state. "Off" ... Page 1 of 17 http://www.certificationzone.com/studyguides /?Issue=34&IssueDate=04-01-2001&CP= 11/06/01 Date of Issue: 04-01-2001 CCNA Layer 2 Switching - Virtual Local Area Networks Lab ... Enterprise edition software. The Cisco IOS software CLI is not available if the switch has been configured with the Standard edition software. While it is possible to complete most of this lab using...

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