wireless networks presentation sample
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Wireless mesh network
A wireless mesh network is a wireless network made up of radio nodes organized in a mesh topology. Each node forwards messages on behalf of the other nodes. Mesh networks can "self heal", automatically re-routing around a node that has lost power.
Wireless LAN
A wireless local area network (WLAN) links two or more devices over a short distance using a wireless distribution method, usually providing a connection through an access point for Internet access. The use of spread-spectrum or OFDM technologies may allow users to move around within a local coverage area, and s t i l l remain connected to the network.
What ’ s Wi-Fi?
A wireless network uses radio waves, just like cell phones, televisions and radios do. In fact, communication across a wireless network is a lot like two-way radio communication.
Wireless-Networks(2)
Wireless NetworksWireless networks have undoubtedly revolutionized the way we communicate and access information in the modern world. From allowing us to seamlessly connect our devices to the internet without the need for cumbersome cables to enabling us to stay connected on the go, the impact of wireless networks on our lives is undeniable. However, like any technological advancement, wireless networks come with their own set of challenges and considerations that need to be addressed to ensure optimal functionality and security. One of the key advantages of wireless networks is the convenience they offer. With the ability to connect to theinternet from virtually anywhere, we are no longer tied down to a specificlocation to access information or communicate with others. Whether we are at home, in the office, or out and about, we can stay connected and productive thanks to the widespread availability of wireless networks. This level of connectivity has transformed the way we work and interact, allowing for greater flexibility and efficiency in our daily lives. Despite the convenience that wireless networks bring, there are also concerns regarding their security and reliability. One of the main challenges faced by users of wireless networks is the risk of unauthorized access or data breaches. Because wireless networks transmit data over the airwaves, they are inherently more vulnerable to interception by malicious actors. It is crucial for users to take steps to secure their wireless networks, such as using strong passwords, enabling encryption, and regularly updating their network security settings to prevent unauthorized access. Another issue that often arises with wireless networks is interference. Because wireless signals travel through the air, they can be affected by various factors such as physical obstacles, electronic devices, and other wireless networks operating in the same frequency range. This can result in signal degradation, slow speeds, and intermittent connectivity issues. To mitigate interference, users can position their wireless routers in optimal locations, use dual-band routers that operate on different frequencies, and adjust their network settings to minimize interference from other devices. In addition to security and interference concerns, the speed and range of wireless networks can also be limiting factors for users. The speed of a wireless network is dependent on several factors, including the type ofrouter, the number of devices connected, and the distance between the device and the router. Users may experience slower speeds or dropped connections if they are too far away from the router or if there are too many devices competing for bandwidth on the network. To improve speed and range, users can invest in high-quality routers, use range extenders or mesh networks, and limit the number of devices connected to the network at any given time. Furthermore, the evolution of wireless technology has led to the emergence of new standards and protocols that aim to improve the performance and security of wireless networks. From the introduction of 5G technology to the development of WPA3 encryption standards, advancements in wireless networking continue to push the boundaries of what is possible in terms of connectivity and security. By staying informed about the latest developments in wireless technology and implementing best practices for network security, users can ensure that they are getting the most out of their wireless networks while safeguarding their data and privacy. In conclusion, wireless networks have transformed the way we communicate, work, and access information in the digital age. While they offer unparalleled convenience and connectivity, it is important for users to be aware of the potential security risks, interference issues, and limitations associated with wireless networks. By implementing best practices for network security, optimizing network settings to minimize interference, and investing in high-quality equipment, users can maximize the performance and reliability of their wireless networks. As technology continues to evolve, staying informed about the latest advancements in wireless networking will be crucial for ensuring a seamless and secure online experience.。
Wireless Network(无线网络)
无线局域网发展
无线局域网技术经过十几年的发展，已经历了 三代技术及产 AP，AP本身储 存了大量的网络和安全的配置，包括加密的密钥，认 证报文终结等，而AP又是分散在各处的，一旦AP的配 置被盗取读出并修改，其无线网络系统就失去了安全 性。特别是在管理方面，每一台AP都要单独进行配置， 费时、费力、费成本。
要对无线网络优化技术进行科学合理地运用，就要求彻底分析和 研究无线网络优化工作涉及到的技术，同时还要完全了解无线网络优 化技术的结构以及内涵。相关无线网络优化人员必须有很强的责任心， 这样才能科学、合理、有效地提升无线网络优化的技术水平。目前， 无线网络优化技术构成包括： 1. 干扰控制技术 2. 无线网络拓扑技术 3. 覆盖优化技术 4. 频率优化技术 5. 切换性能优化技术 6. 话务均衡技术
无线网络优化技术
意义
对无线网络进行优化就是对无线网络的进一步 补充以及完善，改善无线网络现存的一些不足之处。 通过对无线网络的优化，可以使得其更加合理化和 科学化，这是为了适应电信业务的高速发展所要做 出的必然选择，也是为了能够全面提高无线网络的 整体功能以及服务质量所要经历的必然过程。
无线网络优化技术的结构组成
无线局域网
无线局域网技术可以使用户在本地创建无线连接（例如，在校园或 公司的大楼里，或在肯德基等公共场所）。WLAN可用于临时办公室或其 他无法大范围布线的场所，或者用于增强现有的LAN，使用户可以在不同 时间、在办公楼的不同地方工作。 无线局域网(WLAN)技术于20世纪90年代逐渐成熟并广泛使用，既可 以作为传统有线网络的延伸，在某些环境也可以替换传统的有线网络。 相比较传统的有线传输解决方案，无线局域网是使用wLAN网络实现数据 传输，拥有如下显著特点。
简易性：WLAN网络系统集成的施工J陕速简单，可极大地减少 管道架设及布线等繁琐工作； 灵活性：无线技术使得WLAN网络设备可以灵活地进行安装并调 整位置，使无线网络到达有线网络不容易覆盖的位置； 综合预算较低：一方面WLAN网络减少了综合布线的费用，另一 方面在复杂变化的动态环境及需要频繁移动情况中，无线局域 网技术能更好地保护学校的已有投资。同时，由于WLAN技术是 面向数据通信领域的IP传输技术，因而可直接通过千兆白适应 网口和企业内部Internet相连，从体系结构上节省了协议转换 器等相关网络设备； 扩展能力强：WLAN网络体系本身就能支撑多种拓扑结构及平滑 扩容，可以非常容易地从小容量传输系统平滑扩大为中等容量 传输系统。
无线自组织网络3篇
无线自组织网络一、无线自组织网络综述无线自组织网络（Wireless Ad hoc Network，简称WANET）是指在没有任何设备已预先部署的情况下，通过不需要任何网络设备（如路由器、交换机）的辅助，以节点之间的自主协调和通信，在物理范围内建立临时网络。
它是一种分布式、去中心化的通信网络，由多个具有连接、路由和数据转发能力的节点组成，可在不可信任的环境下实现有效的通信。
WANET网络的主要特点是节点随时加入、离开，网络拓扑结构动态变化，同时网络中的节点还要完成路由转发等网络协议功能，网络资源有限，且信息传输会受到信道的干扰影响。
WANET应用广泛，比如：灾难野外通信、军事战场通信、车联网、物流配送、智能家居等领域。
因此，以WANET为研究对象，综述WANET的技术特点和研究进展，对于提高WANET应用的数据传输质量、提升网络安全性、优化网络拓扑结构等方面具有很大的意义。
二、WANET技术特点1. 网络自主建立WANET不需要中央控制，节点可以根据需要自主地建立和拆除连接，构建出网络拓扑结构。
它们之间可以通过广播或目标使命令将信息传递给其他节点，从而有效进行自治通信。
2. 网络动态调整WANET的拓扑结构和节点数量在运行过程中会发生变化，一些节点可能会离开网络并重新加入。
此时，整个网络需要进行调整，以适应网络的变化和节点之间实时连通的需求。
3. 路由机制自动选择WANET中，每个节点都有一定的路由功能。
当数据流动时，它们会动态选择路由以完成数据传输。
通过自动选择最短路径的路由，网络的吞吐量和数据传输效率可以得到极大的提升。
4. 资源有限WANET网络中的节点的资源是非常有限的，主要指存储空间、计算资源和电力。
在资源有限的情况下，如何有效利用每个节点的资源以支持可靠的数据传输是WANET设计的主要难点。
5. 通信受到信道质量的影响WANET中的数据传输主要依赖于无线信道，在移动节点速度和位置变化的情况下，通信质量也会随之改变。
Wireless Networks
Wireless NetworksWireless networks have become an integral part of our daily lives. From connecting to the internet to transferring files and data, wireless networks have revolutionized the way we communicate and share information. However, with the increasing number of devices and users, wireless networks face several challenges that need to be addressed. In this essay, we will explore the requirements and challenges of wireless networks from multiple perspectives. From a user perspective, the primary requirement of wireless networks is seamless connectivity. Users expect to be able to connect to a wireless network without any hassle and enjoy uninterrupted internet access. However, this is not always the case.Wireless networks are susceptible to interference from other devices, obstacles, and distance. As a result, users may experience slow internet speeds, dropped connections, and poor signal strength. To address these issues, wireless networks need to be designed and optimized for the specific environment they are deployed in. From a business perspective, the primary requirement of wireless networks is security. Businesses need to ensure that their wireless networks are secure and protected from unauthorized access. This is particularly important for businesses that deal with sensitive data such as financial information, personal information, and trade secrets. Wireless networks need to be secured using encryption protocols such as WPA2 and firewalls to prevent unauthorized access and data breaches. From a technical perspective, the primary requirement of wireless networks is scalability. Wireless networks need to be able to accommodate an increasing number of devices and users without compromising performance. This requires the use of advanced technologies such as multiple access points, load balancing, and network segmentation. Additionally, wireless networks need to be designed for flexibility and future growth, allowing for easy expansion and upgrades. One of the biggest challenges facing wireless networks is interference. Interference can come from a variety of sources, including other wireless networks, microwave ovens, and even physical obstacles such as walls and buildings. Interference can cause signal degradation, slow internet speeds, and dropped connections. To address this challenge, wireless networks need to be designed and optimized to minimize interference. This can be achieved through the use of directional antennas,frequency hopping, and channel selection. Another challenge facing wireless networks is security. Wireless networks are vulnerable to attacks such as eavesdropping, spoofing, and denial of service. These attacks can compromise the security of the network and the data transmitted over it. To address this challenge, wireless networks need to be secured using encryption protocols, firewalls, and network segmentation. Additionally, users need to be educated on best practices for wireless network security, such as using strong passwords and avoiding public Wi-Fi networks. Finally, a major challenge facing wireless networks is the increasing demand for bandwidth. With the proliferation of high-bandwidth applications such as video streaming and online gaming, wireless networks need to be able to provide sufficient bandwidth to accommodate these applications. This requires the use of advanced technologies such as 5G and Wi-Fi 6, which offer higher data rates and lower latency. Additionally, wireless networks need to be designed and optimized for the specific needs of the application, such as prioritizing real-time applications over non-real-time applications. In conclusion, wireless networks have become an essential part of our daily lives, providing seamless connectivity and enabling us to share information and communicate with each other. However, wireless networks face several challenges that need to be addressed, including interference, security, and bandwidth. To address these challenges, wireless networks need to be designed and optimized for the specific environment they are deployed in, secured using encryption protocols and firewalls, and equipped with advanced technologies such as 5G and Wi-Fi 6. By addressing these challenges, we can ensure that wireless networks continue to provide reliable and secure connectivity for years to come.。
Wireless Networks
Wireless NetworksWireless networks have become an integral part of our daily lives, enabling us to stay connected and access information from anywhere. This technology has revolutionized the way we communicate, work, and interact with the world around us. In this response, we will delve into the historical background, different perspectives, case studies, benefits, drawbacks, and future implications of wireless networks. The concept of wireless communication can be traced back tothe late 19th century when Guglielmo Marconi successfully transmitted the first radio waves across the Atlantic Ocean. This groundbreaking achievement laid the foundation for modern wireless technology. Fast forward to the 20th century, the invention of the mobile phone and the subsequent development of wirelessnetworking protocols such as Wi-Fi and Bluetooth have further propelled the evolution of wireless networks. From a historical perspective, wireless networks have undergone significant advancements, leading to the proliferation of various wireless devices and technologies. The introduction of 3G, 4G, and now 5G networks has further expanded the capabilities of wireless communication, enabling faster data transmission and supporting a wide range of applications, from videostreaming to IoT devices. In the realm of wireless networks, there are various perspectives and opinions that shape the discourse surrounding this technology. On one hand, proponents of wireless networks emphasize the convenience andflexibility it offers, allowing users to access the internet and communicate without being tethered to a physical connection. This has transformed the way we work, enabling remote collaboration and fostering a more dynamic and mobile workforce. On the other hand, there are concerns regarding the security and privacy implications of wireless networks. With the increasing prevalence of cyber threats and data breaches, the vulnerability of wireless communication has come under scrutiny. The potential for unauthorized access to wireless networks and the interception of sensitive information raise valid concerns about the safety of wireless technology. To illustrate the impact of wireless networks, let'sconsider a case study of a small business that leverages wireless connectivity to enhance its operations. A boutique coffee shop implements a wireless POS system, allowing customers to make cashless transactions seamlessly. This not onlyimproves the overall customer experience but also streamlines the business's payment process. Additionally, the shop utilizes wireless internet access to offer a cozy and productive environment for remote workers and students, attracting a wider customer base. Despite the evident benefits of wireless networks, there are drawbacks that warrant careful consideration. One of the primary concerns is the potential health risks associated with prolonged exposure to electromagnetic radiation from wireless devices. While the scientific community remains divided on this issue, it is essential to acknowledge the ongoing debate and prioritize further research to ensure the safety of wireless technology. Moreover, the reliance on wireless networks introduces the risk of network congestion and interference, especially in densely populated areas. This can lead to slower connection speeds and reduced network performance, impacting user experience and productivity. As the demand for wireless connectivity continues to grow, addressing these challenges becomes imperative to sustain an efficient andreliable wireless infrastructure. Looking ahead, the future implications of wireless networks are multifaceted. The ongoing development of 5G technology promises to deliver unprecedented speed and connectivity, unlocking new possibilities for IoT, autonomous vehicles, and augmented reality. However, this also necessitates robust infrastructure investment and regulatory frameworks to support the seamless integration of 5G networks. In conclusion, wireless networks have undoubtedly redefined the way we communicate and interact with technology. While the benefits of wireless connectivity are undeniable, it is crucial to address the associated drawbacks and concerns to ensure a secure and sustainable wireless ecosystem. As we embrace the future of wireless networks, it is essential to prioritize innovation, collaboration, and responsible usage to harness the full potential of this transformative technology.。
无线投影仪说明书 WGA210 wireless presentation system
Wireless Presentation AdaptorUser’s Manual(Model Name: WPS-Speedy)Version: 1.5Date: Sep. 24, 2010Table of Contents1.Overview (4)2.Quick Start (6)3.W indow s Client Utility (10)3.1Starting Program (10)3.2Login (11)3.3Main User Interface (11)3.4Screen Projection (11)3.5Audio Projection (12)3.6Menu Description (13)3.6.1Show Login Code (13)3.6.2Open Admin W eb Page (14)3.6.3W iFi AP-Client Configuration (14)3.6.4Searching Server (15)3.6.5Projection Source (15)3.6.6Auto W iFi Connect (16)3.6.7Auto Pow er Manager (16)3.6.8Hide UI (17)3.6.9Advanced Screen Capture (17)3.6.10Make W PS Token (18)3.6.11Copy Application to desktop (19)3.6.12Hot Key (20)3.6.13About (20)3.6.14Exit (21)4.W indow s Mobile Utility (22)4.1Dow nload from W PS box (22)4.2Using MobiShow w ith a Smartphone (22)5.W eb Management (27)5.1Home Page (27)5.2Dow nload Softw are (27)5.3Conference Control (28)5.4Login W eb Admin (30)5.4.1System Status (30)5.4.2Netw ork Setup (31)5.4.3OSD Setup (33)5.4.4Projection Setup (34)5.4.5Change Passw ords (35)5.4.6Reset to Default (35)5.4.7Firmw are Upgrade (36)5.4.8Reboot System (37)5.4.9Logout (38)6.Appendix (39)Screen Image Background Maker (39)Using PtG Converter (44)1.O verviewWPS is a must-have device for your meeting room! It turns your existing "wired" projector into a "high-end wireless" projector. With the revolutionary Plug-and-Show wireless projection features, WPS makes every of your presentation and meeting efficient and successful.⏹High Performance Wireless Projection & Audio ProjectionWith the revolutionary high performance wireless projection with audio, you can easily share the multimedia on the big monitor with friends without cable hassle.⏹Plug & ShowWith the accompanied Plug & Show USB Token, wireless presentation becomes easy! Just link your PC/Laptop to WPS (through WLAN or Ethernet), plug the token into a USB port, and in seconds, your screen will be wireless projected to the connected projector!⏹4-to-1 Split Screen ProjectionWith this 4-to-1 split screen feature, up to four PC screens can be projected to one projector in the same time. Thus you can easily do side-by-side comparison from four PC / PDAs to increase meeting productivity!⏹Smartphone wireless projectionWPS supports MobiShow function for windows mobile 5/6 system. By launching MobiShow utility, MobiShow brings your mobile screen to big screen and which can play photos and PtG files stored in your mobile phone for presentation.⏹SNMP ManagerBy enabling SNMP (Simple Network Management Protocol Version 2c) Manager, you can manage devices for each or batch. No need to login device’s Web page each by each for changing device settings anymore.⏹Change Standby ScreenYou can use the application “Screen Image Background Maker” to change the Splash Screen. Design the image with message you would like to present, upload it through web control page, and you could have customized starting page.⏹AP Client ModeYou can enable the AP-Client Mode function to let WPS join the existing Access Point through Wi-Fi. This feature provides the flexibility of wireless network deployment in enterprise environment.Features■ Support Windows Win7, Vista, XP, and Mobile 5/6■ Plug and Show! No installation required … just plug in the accompanied token to a USB port, and hassle free presentation can bestarted in seconds.■ 4-to-1 split screen projection! Turn one projector into four, increase meeting productivity right away.■ Smartphone wireless projection! PC-less stylish presentation becomes possible!■ Conference control! Allows moderators to streamline grand meetings.■ Provide session security login, wireless WEP/WPA key and Gatekeeper function to protect presentation contents and keep good security tooffice networks.■ Support High Performance screen projection with audio.■ Changeable Splash Screen image!■ SNMP Manager! To manage the devices easily■ AP-Client Mode! Deploy wireless network in enterprise environment easily2.Q uick Start1)Connect projector VGA/HDMI cable to WPS box VGA/HDMI connector andturn on projector power.2)Turn on WPS box.♦When Projector shows the default menu on the screen as below, it indicates the WPS box is ready now.3)Make sure your PC WLAN is enabled already, and connect your PC with WPSbox.4)Open your browser and enter the IP address to access the WPS web homepage.♦The default IP address of WPS is 192.168.100.10 or refers to the IPaddress shown on the left corner of projector screen.XP ” or ”Windows Mobile 5/6” and execute the installation program.♦ After installing the program, you will see the WPS shortcut on the PC screen.6)Make sure your personal firewall allows WPS software to pass through.7)Select device that your want to projection8)Enter the LOGIN CODE and You can see the login code on the projectorscreen9)Click the “Play” button to start projection!3.W indows Client Utility3.1Starting ProgramAfter you download WPS Windows program via web page successfully, then follow below steps to start.1)Click WPS icon to execute the program.2)Program start to search for WPS box automatically,3)If WPS box founded then “Login Code” dialog box will be pop up on the PCscreen.●Searching for WPS box●WPS box is founded and enter login code to start.3.2Login1)After “Login Code” dialog box shown, enter login code to start presentation. 2)You can see the login code shown on the projector screen.3.3Main User Interface3.4Screen ProjectionClick the “Play” button for full or split screen, you can project the main screenon to the display immediately, click the “Pause” button, you can freeze you projection screen, click the “Stop” button to stop projecting your screen, byMenu AreaStatus IndicatorSpeedy modeclicking speedy mode button, the projection will enter speedy mode for faster projection.*. 4-1 function will be disabled in speedy mode.*. To enable audio projection, you have to install provided audio driver first.3.5Audio ProjectionBefore starting the Audio Projection, please install the “VAC.exe” (Virtual Audio Control) on your computer. Please find the software in USB Token and you can hear the audio from device when projecting.3.6 Menu Description3.6.1Show Login CodeClick “Show Login Code”, it will display the login code on the right-upper of desktop and close it automatically after 10 seconds. You can also click on the area to close this window manually.Login CodeMenu3.6.2Open Admin Web PageClick to open function menu and select “Web Admin” management web page. The web page detailed functions will be described on next chapter.3.6.3WiFi AP-Client ConfigurationClick “WiFi AP-Client Configuration” to set AP client mode to join others Access Point via wireless, besides, the others user client also can login WPS for presentation and join to others Access Point network,3.6.4Searching ServerClick “Search Server” to re-search the WPS again.3.6.5Projection SourceClick the “Projection Source”, you can select to project the main screen of desktop or the virtual extended screen.P.S: Virtual Extended Screen optionYou need to install “VDD.exe” driver first which is stored in the USB token.3.6.6Auto WiFi ConnectClick “Auto WiFi Connect” to enable the auto WiFi discovery and connection function for quick wireless set up.3.6.7Auto Power ManagerTo make the highest projection performance, application will turn the PC’s windows power scheme from current settings to “highest performance”, however, you can click the “Auto Power Manage” to enable or disable this function and restore you power scheme immediately.3.6.8Hide UIClick the “Hide UI”, you can choose to hide or display the application control panel from projection screen.3.6.9Advanced Screen CaptureClick the “Advanced Screen Capture”, you will be able to see tip windows and other layered windows (include the main UI) on the connected display. However, the mouse cursor may blink from time to time when you are projecting your PC screen!Disable “Advanced Screen Capture”.Enable “Advanced Screen Capture”.3.6.10 Make WPS TokenClick “Make WPS Token” to make a USB WPS Token, you can insert a USB thumb drive and follows the wizard to make the Token.3.6.11Copy Application to desktopClick the “Copy Application to desktop”, it will copy the application to your desktop immediately even you don’t have the system privilege3.6.12Hot KeyClick “Hot Key” to show Hot Key guide. You can use hot key to control the projection by keyboard.3.6.13AboutClick “About” to show system information. It includes product model name, Client version, IP address and other information.3.6.14ExitClick “Exit” to exit this application. It will stop current playing status and close the application immediate.4.W indows Mobile Utility4.1Download from WPS box1)Turn on WiFi on your phone.2)Connect your phone to MobiShow wireless network. The SSID is displayedon screen3)Open the browser on your phone and enter the IP address of the MobiShowbox.♦The default IP address is 192.168.100.10.♦Or, refer to the IP address which shown on the projector screen.4)Click the “Download” link to download the software installer (in CAB format)to your phone.5)Open Explorer on your phone and find the CAB file.6)Double click on the CAB file to start installation.7)Follow on-screen instructions to finish installation.4.2Using MobiShow with a Smartphone1)Open “Programs” on your phone and find “MobiShow” application.2)Select “MobiShow” icon to launch the client software.3)MobiShow will turn on Wi-Fi on your phone and list available access pointsfor you to choose.4)Select a MobiShow wireless network (SSID with prefix MobiShow) toconnect to.5)MobiShow client will connect to that access point and search for MobiShowdevices automatically. When a MobiShow device is found, it willautomatically login and the following main menu is shown on your phone.If more than one MobiShow devices are found, the following list will be displayed for you to select the one to use.1)Select which feature to use. To project the screen of your phone, click onthe “Screen” icon. To do a PC-less presentation with Presentation-to-Go (PtG), select the “PtG” icon.●Screen Projection:MobiShow will project anything displayed on your screen. You may launch another application (such PowerPoint Viewer) or open any file (such as Word document or JPG image) and it will be projected to the projector. Note: Do not exit MobiShow application while opening other application to keep screen projected.Click the “Stop” icon to stop projection.Click the “Pause” icon to pause projection. Click “Pause” again to resume projection.Click the “Zoom” icon to zoom the projected screen to extend the longest side of your screen to fill the screen.Click the “Play” icon to start projection again if it is stopped.Click the “OK” button or “Back” to return to main menu.●Wireless PtG:When you select PtG function, MobiShow client will automatically open Explorer for you to select a PtG file. Select the file to open for your presentation. When the file is open, the PtG slides will be projected, and the following screen is displayed on your phone for you to control your PtG presentation.Click “Prev” or “Next” to go to the previous or next item in the slide. Click “PgUp” or “PgDn” to go to previous or next slide.Click “Stop” to stop projecting the file. The icon will become “Play” if the file is not played. Click “Play” again to play the file if it is stopped.Click “Home” to go to the first slide.Click “Jump” and MobiShow client will show every slide on the phone. You can select any page to go to.Click “Open” to select another PtG file.Note:You need to use “PtG converter.exe” to convert Powerpoint become PtG file first. You canfind out “PtG converter.exe” in the USB TokenPhoto Slideshow:You can use MobiShow to project photos stored on your phone to big screen. The photos will be prepared for playback on big screens rather than for the tiny screens of your phone.To open a single photo, select one photo and click the OK button. The photo will be displayed on the display connected to MobiShow device.Click “Prev” or “Next” to go to the previous or next photo in the same folder. Click “Play” to start photo slideshow with photos in the same folder. The button will be changed to “Pause” during slideshow. Click “Pause” to stop slideshow.When the file is open, the media will be projected, and the following screen is displayed on the phone for you to control your media playback.5.Web Management5.1Home Page1. Make sure your PC connect to WPS box successfully.2. Open your browser, it will enter WPS home page automatically.3. If not, enter your IP address on the browser, you can see the IP on the projector screen.4. The default IP is 192.168.100.105.2 Download Software1.Select “Download software” function.2.Please select the “Win 7 / Windows Vista / XP ” or “Windows Mobile 5/6” or“Mac Utility” and execute the installation program.3.Follow Installation Wizard instructions to proceed till the installation processcomplete.4.If pop up “Windows Security Alert” because Windows firewall block thisprogram. You just press “Unblock” button to continue installation.5.Once installation complete, a utility shortcut come out on the screen.5.3 Conference Control1)This function allows you to host a meeting smoothly without projector cableswapping and each participant can show their presentation easily.2) Select “Conference Control” function.3)Enter password, the default value is “trainer”, and then press [Login].4)After login, you can see a User List on the screen which indicates all of usersconnected to WPS box.5)There are three columns, “Computer Name”, “Play Control” and “IPAddress”.6)Play Control，There are six buttons, including Play(Full), Play Split #1, Play Split #2 ,Play Split #3 , Play Split #4 and Stop . 7)User List5.4Login Web Admin1.Click [Admin] and then enter password to login web page.2.The password default value is “admin”.5.4.1System StatusClick [System Status], shows current system status.Model Name: Product model nameVersions:1.Firmware version no.: Product firmware version number. Network Status:1.IP address：IP address of WPS device.2.Subnet Mask：subnet mask3.Default Gateway：default gateway4.Wireless MAC address：wireless MAC address5.Wire MAC address：wire MAC addressConnection Status:1.Projecting status: which is “Waiting for projecting” or “Projecting”2.Total Users: It shows how many users login into WPS box.5.4.2Network SetupThere are many kinds of operating configurations as below.< Auto-Configuration Network Setup>The default setting of the WPS box is DHCP client. When the WPS box is connected to a LAN that already has a DHCP server present, the WPS box takes an IP address assigned to it by the server. When the WPS box is connected to a LAN that does not have a DHCP server, the WPS box becomes the DHCP server in the network.< IP Setup>♦You can select “obtain IP address automatically” or “Use the following IP address”♦IP Address: The default value is 192.168.100.10.♦Subnet Mask: The default value is 255.255.255.0♦Default Gateway: The default value is 192.168.100.10♦DNS Server: The default value is 192.168.100.10<DHCP Server Setup>♦You can select “auto(Enable/Disable DHCP Server” or “Disable”)♦Start IP: The start IP address of DHCP Server.♦End IP: The end IP address of DHCP Server♦Subnet Mask: The default value is 255.255.255.0♦Default Gateway: The default value is 192.168.100.10♦DNS Server: The default value is 192.168.100.10< Wireless Setup>♦Wireless LAN: The default value is “Enable”.Embedded AP SSID:SSID string ,max. Length is 32 bytes.♦Connect to Existing AP: This is “AP client” mode feature. By this feature you can join others Access Point via wireless.First, enter the existing AP’s SSID and require security key in “ExistingAP SSID” and “Key”, then reboot your system. After these steps, WPSwill connect to this AP by wireless automatically.Note: The default value of AP client mode is “ Disable”, and LANfunction will be disabled during AP client mode.♦Region: default value is “Worldwide”.♦SSID Broadcast: The default value is “Enable”♦Channel: to set fixed channel or Auto. The “Auto” means after power on WPS, it will scan all of wireless channel and select clear one channelautomatically.♦Encryption: you can select “Disable” or one of WEP/WPA/WPA2 64bit or 128bit in ASCII or HEX string.♦Key: If Encryption is enabled, you have to set key value according to the encryption mode you selected.< Gatekeeper>Gatekeeper is designed for ensuring the enterprise network security within WPS box♦All Block can block Guest Users(through wireless) to access all office network(LAN),♦All Allow can pass Guest Users(through wireless) to access all office network♦Internet Only can block Guest Users (through wireless) from office network (LAN) but still reserve internet connection capability.<Apply >: press button to select this mode.<Cancel>: press button to abort action.<Back>: Back to Operating mode main menu.5.4.3OSD SetupClick [OSD Setup] button, to change OSD standby image.♦<Restore Initial>: Restore to default OSD standby image.♦<Image File Upload>: Upload the customized OSD standby image. (You need to convert the image to system defined formatusing provided IB Maker utility which is stored in the USB token.)5.4.4Projection SetupClick [Projection Setup] button♦<Resolution>:VGA: XGA(1024*768), WXGA(1280x800) ,WXGA (1280*768) andSVGA(800*600). The default value is XGA.HDMI: 720p(1280*720)♦<Screen Refresh Rate>: This is VGA output refresh rate, provides60 Hz and 75Hz to suit for different kinds of projectors.♦<Login Code>: You can select “Disable”, “Random”, or “Use the following code” to set a specified 4-characters Number.♦<Apply>：Confirmation and Save modifications♦<Cancel>: Cancel all the modifications5.4.5Change PasswordsClick [Change Password] button, to change password value.The length of password is up to 8 characters.♦<Enter New Password>: enter new password you want to change for each category.♦<Confirm New Password>: double confirm new password.♦<Apply>: Confirmation and Save modifications.5.4.6Reset to DefaultClick [Reset to Default] button to restore factory default settings.<Apply>: Confirmation and action.5.4.7 Firmware UpgradeClick [Firmware Upgrade] button to upgrade firmware.1.Firstly, you have to get latest firmware image file from your vendor.2.Click <Browse> to specify file name you want to upgrade.3.Click <Upgrade> to start.4. A warning message shown and count down counter on the screen.5.After a few minutes, a complete message shown on the screen.6.Restart WPS box to take effect.Warning: Don’t power off WPS while firmware upgrade in progress, otherwise will cause your Box doesn’t work and have to return device to your vendor for fixing.5.4.8 Reboot SystemClick [Reboot System] button, to restart system♦<Reboot>: reboot system automatically.5.4.9 Logout6.AppendixScreen Image Background Maker Quick Installation GuideVersion: 1.001)Run the “Screen Image Background Maker” and follows the wizard toconvert the image file.2)Press “Open” to select a file to convert this image for background use.3)Press “Saver” to save this file.(*.ib)4)Please connect to WPS webpage, and then connect to OSD setup page.5)Press “Browser” to choose the *.ib file.6)Press “image file upload” to upload your background image.Then it will show the message as below.Note: You may find “Screen Image Background Maker” in the USB Token.PtG Converter Quick Installation GuideVersion: 1.00Using PtG ConverterOpen “MobiShow PtG Converter” in “MobiShow\MobiShow PtG Converter” folder from “Programs” in the Start menu. The following control panel is displayed on your Desktop when it is launched.Click the “Convert” button to select a PowerPoint PPT file and start conversion. PtG Converter will open the PowerPoint file and convert it to PtG format. You can see the conversion process on your Desktop.Click the “Preview” button to expand or collapse the preview pane. Click “Play” to playback selected PtG file, or click “Open” to select a PtG file.。
Wireless Networks.ppt
How do wireless LANs work?
Wireless LANs operate in almost the same way as wired LANs, using the same networking protocols and supporting the most of the same applications.
Common Topologies
Complete Wireless Networks
• The physical size of the network is determined by the maximum reliable propagation range of the radio signals.
• Users maintain a continuous connection as they roam from one physical area to another
• Mobile nodes automatically register with the new access point.
• Methods: DHCP, Mobile IP • IEEE 802.11 standard does not
• Wireless Technology overview • The IEEE 802.11 WLAN Standards • Secure Wireless LANs • Migrating to Wireless LANs (Cutting the cord)
Wireless?
• A wireless LAN or WLAN is a wireless local area network that uses radio waves as its carrier.
Yealink WPP30 Wireless Presentation Pod用户指南说明书
WPP30Wireless Presentation PodWireless Sharing, Efficient Presentation with One-PressThe Y ealink WPP30 is a new 4K Ultra HD wireless presentation pod. Empowered with up to 4K/30FPS UHD hardware encode streaming output, WPP30 saves a lot of effort by eliminating any software or driver installation. A USB Type-A/ full-featured USB Type-C port is suitable for different computers and phones. Since WPP30 has the embedded meeting assistant software and Wi-Fi 6 chip, simply plug WPP30 into the devices, and you can quickly ready to present. WPP30 provides you with a more convenient and richer content sharing experience.Key Features and BenefitsWireless Presentation with High Security and EncryptionWith Y ealink self-built Wi-Fi network, no routers or extra network configuration required. Therfore,WPP30 has low dependence to the business network and makes sharing smooth and easy. Appliedwith AES encryption and WPA high-security data encryption technology, WPP30 prevents contentsharing from accidental leakage or tampering.4K HD Presentation, Low LatencyThanks to the high-performance 2x2 MIMO, Wi-Fi 6 module, WPP30 delivers immediate response,smooth and trouble-free presenting experience with low latency. WPP30 supports a 2.4GHz/5GHzdual-band wireless network, perfect anti-interference capability, and up to 4K/30fps ultra HD pre-sentation.No Extra Driver, Plug-and-playWPP30 is suitable for the devices that support free collaboration and have full-featured USB T ype-Cport. WPP30 adopts the built-in hardware encoding chip solution. No need to install any software ordriver, and no CPU-occupied.Rich Collaboration Ways, Efficient Team WorkWPP30 supports up to four streams to be presented simultaneously on the main screen. It can pro-vide annotation and virtual whiteboard features to integrate participant opinions and promote inter-action and collaboration between participants. Interoperable with a touchscreen television, intuitiveremote control of the computer or laptop is easily enabled by clicking or dragging directly on yourinteractive television.• Self-built Wi-Fi Network• 4K/30fps Full HD Content Sharing• Adaptive Software/Hardware Encoding• Supports Dual-band 2.4GHz/5GHz WirelessNetworks• Plug and Play, without Extra Software orDriver• Full-featured USB Type-C and USB Type-APorts• AES & WPA Data Encryption• Adapt to Computers and Mobile Phoneswith Different Ports• 4-Screen Casting• Support Annotation/Whiteboard/ReverseControlExtended Display CastingWi-Fi 6 ChipIntuitive Remote ControlHardware Encoding High Security Encryption4-Screen CastingSpecificationsBasic Input Power5V/600 mAPower Consumption 2.2 W (Typical)Interface• Full-featured USB Type-C×1• USB-C to USB-A Adapter x1 Button• START/STOP Button x 1 LED• 4K/UHD Indicator ×1• System Error Indicator×1• System Status Indicator×1Wi-Fi Standard Wi-Fi 6, 802.11 a/b/g/n/ac/ax Frequency 2.4 GHz/5 GHz Encryption WPA-PSK/WP A2-PSKBluetooth Standard Bluetooth 5.0Advanced Features Desktop Sharing• Duplicated Display• Extended Display Collaboration• Annotation• Virtual Whiteboard• Intuitive Remote Control• Multiple Screens ShareOperating Environmental Temperature range -10 to 40℃Humidity0 to 95%, non-condensingDimensions Weight (g/lb)75 g (0.165 lb)Size (mm/in)220 mm × 38 mm × 16 mm (8.66″ x1.50″×0.63″)About YealinkY ealink (Stock Code: 300628) is a global-leading provider of Unified Communication & Collaboration Solutions specialized in video con-ferencing, voice communications, and collaboration, dedicated to helping every person and organization embrace the power of “Easy Collaboration, High Productivity”.With best-in-class quality, innovative technology, and user-friendly experiences, Y ealink is one of the best providers in more than 140 countries and regions, ranks No.1 in the global market share of IP Phone, and is the T op 5 leader in the video conferencing market (Frost & Sullivan, 2021).CopyrightCopyright © 2022 YEALINK(XIAMEN) NETWORK TECHNOLOGY CO., LTD.Copyright © 2022 Y ealink(Xiamen) Network T echnology CO., LTD. All rights reserved. No parts of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, photocopying, recording, or otherwise, for any purpose, without the express written permission of Y ealink(Xiamen) Network T echnology CO., LTD.Technical SupportVisit Y ealink WIKI (/) for firmware downloads, product documents, FAQ, and more. For better service, we sin-cerely recommend you to use Y ealink Ticketing system (https://) to submit all your technical issues.YEALINK(XIAMEN) NETWORK TECHNOLOGY CO.,LTD.Web: Addr: No.1 Ling-Xia North Road, High T ech Park, Huli District,Xiamen, Fujian, P.R.CCopyright©2022 Y ealink Inc.All right reserved.。
Wireless Networks
Wireless NetworksWireless networks have become an integral part of our daily lives, revolutionizing the way we connect and communicate with each other. The evolution of wireless technology has enabled us to stay connected on the go, whether it's checking emails, streaming videos, or staying in touch with loved ones. With the rise of smartphones, laptops, and other connected devices, the demand for faster and more reliable wireless networks has soared. One of the key advantages of wireless networks is their flexibility and convenience. Unlike traditional wired networks, wireless networks allow users to access the internet from anywherewithin the network's range. This freedom of movement has transformed the way we work and play, enabling us to stay productive even when we're on the move. Whether it's working from a coffee shop, streaming music at the gym, or video chattingwith friends from the park, wireless networks have made it easier than ever tostay connected. However, the convenience of wireless networks also comes with its own set of challenges. One of the biggest concerns is network security. Wireless networks are more vulnerable to hacking and unauthorized access compared to wired networks. Without proper security measures in place, sensitive information such as personal data, financial details, and business documents can be easily compromised. This has led to an increased focus on network security, with businesses and individuals investing in encryption, firewalls, and other security protocols to protect their data. In addition to security concerns, the performance of wireless networks can also be affected by external factors such as network congestion, interference, and signal range. Wireless signals can be disrupted by physical obstacles such as walls, furniture, and other electronic devices, leading to slow connection speeds and dropped connections. To address these issues, network providers are constantly innovating and improving their technologies to deliver faster, more reliable wireless connections. The impact of wireless networks goes beyond just connectivity. It has also revolutionized industries such as healthcare, education, and transportation. In healthcare, wireless networks enable doctors and nurses to access patient records and medical information in real-time, improving the quality of care and patient outcomes. In education, wireless networks enable students to access online resources, collaborate with peers, and take virtualclasses from anywhere in the world. In transportation, wireless networks are used to track vehicles, monitor traffic patterns, and improve road safety. Despite the challenges and concerns associated with wireless networks, the benefits far outweigh the drawbacks. The freedom and flexibility that wireless networks provide have transformed the way we live, work, and communicate. As technology continues to advance, we can expect to see even faster, more reliable wireless networks that will further enhance our connectivity and productivity. Wireless networks have truly changed the world, connecting us in ways we never thought possible.。
Wireless Networks
Wireless NetworksWireless networks have become an integral part of our daily lives, providing us with the convenience and flexibility to connect to the internet and communicate with others without being tethered to a physical connection. However, with this convenience comes a myriad of challenges and issues that need to be addressed in order to ensure the reliability, security, and efficiency of wireless networks. One of the primary problems with wireless networks is the issue of signal interference. As more and more devices and networks compete for the limited radio frequency spectrum, the likelihood of signal interference increases, leading to degraded network performance and reliability. This can be particularly frustrating for users who experience dropped connections, slow speeds, and erratic behavior from their wireless devices. Another major concern with wireless networks is security. Wireless networks are inherently more vulnerable to unauthorized access and attacks compared to wired networks. This is due to the broadcast nature of wireless signals, which can be intercepted by malicious actors with the righttools and knowledge. As a result, ensuring the security of wireless networks is crucial in order to protect sensitive data and prevent unauthorized access to the network. Furthermore, the issue of network congestion is a significant problemfor wireless networks, especially in densely populated areas such as urban centers or office buildings. The high density of wireless devices and networks in these areas can lead to congestion and overcrowding of the radio frequency spectrum, resulting in slower speeds and decreased network performance for all users. In addition to these technical challenges, there are also social and ethical issues surrounding wireless networks. For example, the ubiquitous nature of wireless connectivity has raised concerns about the potential health effects of long-term exposure to radio frequency radiation. While the scientific community has not reached a consensus on the matter, the public perception of the potential health risks associated with wireless networks can impact the adoption and deployment of wireless technologies. Moreover, the digital divide is another pressing issuethat needs to be addressed in the context of wireless networks. While wireless connectivity has the potential to bridge the gap between the connected and unconnected populations, there are still significant barriers to access forunderserved communities, whether it be due to economic, geographical, or infrastructural limitations. Bridging this gap and ensuring equitable access to wireless networks is essential for promoting digital inclusion and empowering marginalized communities. In conclusion, wireless networks have revolutionized the way we connect and communicate, but they also present a host of challengesthat need to be addressed. From technical issues such as signal interference and network congestion to social and ethical concerns surrounding security, health, and digital inclusion, there are a multitude of factors that need to be considered in order to ensure the reliability, security, and accessibility of wireless networks. As we continue to rely on wireless connectivity in our personal and professional lives, it is crucial to work towards solutions that mitigate these challenges and create a more robust and inclusive wireless network infrastructure.。
Wireless Networks
Wireless NetworksWireless networks have become an integral part of our daily lives, revolutionizing the way we communicate, work, and connect with the world around us. However, like any technology, wireless networks come with their own set of challenges and problems that need to be addressed. In this response, we will explore the various issues surrounding wireless networks, including security concerns, reliability, and the impact on human health and the environment. One of the most pressing issues with wireless networks is the issue of security. With the increasing prevalence of cyber attacks and data breaches, ensuring the security of wireless networks has become a paramount concern. Hackers can exploitvulnerabilities in wireless networks to gain unauthorized access to sensitive information, leading to potential identity theft, financial loss, and privacy violations. As individuals and businesses alike rely heavily on wireless networks for their day-to-day operations, the need for robust security measures to protect against these threats is more critical than ever. Another significant problemwith wireless networks is the issue of reliability. While wireless technology has undoubtedly made great strides in improving connectivity and accessibility, it is not without its drawbacks. Users often experience dropped connections, slow speeds, and interference issues, especially in densely populated areas where multiple devices compete for limited bandwidth. These reliability issues can be frustrating and disruptive, particularly in a professional setting where a stable and consistent connection is essential for productivity. In addition to security and reliability concerns, there is also a growing debate surrounding the potential health risks associated with prolonged exposure to wireless networks. Some studies have suggested that the electromagnetic radiation emitted by wireless devices and infrastructure could have adverse effects on human health, ranging from minor discomfort to more serious conditions such as cancer. While the scientific community has yet to reach a consensus on this matter, the public concern over the potential health implications of wireless technology continues to fuel ongoing research and discussions. Moreover, the environmental impact of wireless networks cannot be overlooked. The proliferation of wireless devices and infrastructure has led to an increase in electronic waste, as older devices are discarded in favor ofnewer, more advanced models. Furthermore, the energy consumption required to power and maintain wireless networks contributes to the overall carbon footprint,raising questions about the sustainability of our reliance on wireless technologyin the long run. Despite these challenges, it is important to recognize the numerous benefits that wireless networks bring to our society. From enabling seamless communication and collaboration to driving innovation and economic growth, wireless technology has undoubtedly transformed the way we live and work. As we navigate the complexities of wireless networks, it is crucial to strike a balance between harnessing the potential of this technology and addressing the inherent problems it presents. In conclusion, wireless networks have become an indispensable part of modern life, offering unprecedented convenience and connectivity. However, we must also confront the various challenges and issuesthat come with this technological advancement. By prioritizing security, improving reliability, addressing health concerns, and mitigating environmental impact, we can strive to create a safer, more sustainable wireless network infrastructure for the benefit of all.。
Wireless Networks
Wireless NetworksWireless networks have become an integral part of our daily lives, enabling us to stay connected and access information on the go. From browsing the internet on our smartphones to streaming videos on our laptops, wireless networks have revolutionized the way we communicate and consume content. However, with this convenience comes a host of challenges and considerations that must be taken into account. One of the key concerns surrounding wireless networks is security. As we increasingly rely on these networks to transmit sensitive information such as financial data and personal details, the risk of unauthorized access and data breaches becomes a pressing issue. It is essential for users to take proactive measures to secure their wireless networks, such as using strong passwords, enabling encryption, and regularly updating firmware to protect against potential threats. Another important consideration when it comes to wireless networks is speed and reliability. With the growing demand for high-speed internet access, users expect their wireless networks to deliver fast and consistent performance. Factors such as signal interference, network congestion, and distance from the router can all impact the speed and reliability of a wireless connection. It is crucial for users to optimize their network settings and invest in quality equipment to ensure a seamless online experience. In addition to security and performance, the proliferation of wireless networks also raises concerns about privacy. As we connect to public Wi-Fi networks in cafes, airports, and other public spaces, we expose ourselves to potential risks such as data interception and tracking. It is important for users to exercise caution when using public Wi-Fi and consider using a virtual private network (VPN) to encrypt their internet traffic and protect their privacy. Furthermore, the increasing number of devices connected to wireless networks, from smartphones and tablets to smart home devices and IoT gadgets, poses a challenge in terms of network management and bandwidth allocation. As more devices compete for bandwidth, network congestion can occur, leading to slower speeds and dropped connections. Users must prioritize their devices and allocate bandwidth accordingly to ensure a smooth and efficient network experience. Despite these challenges, wireless networks continue to evolve and improve, with advancements in technology such as 5G networks and Wi-Fi6 promising faster speeds, lower latency, and greater capacity. These developments hold the potential to revolutionize the way we connect and communicate, opening up new possibilities for innovation and collaboration in various industries. In conclusion, wireless networks play a crucial role in our interconnected world, offering unparalleled convenience and connectivity. However, it is important for users to be aware of the challenges and considerations associated with wireless networks, such as security, speed, reliability, privacy, and network management. By taking proactive measures and staying informed about the latest advancements in wireless technology, we can harness the full potential of wireless networks while safeguarding our data and privacy.。
Wireless Networks
Wireless NetworksWireless networks have become an integral part of our daily lives, providingus with the convenience and flexibility to stay connected anytime and anywhere. However, like any technology, wireless networks come with their own set of challenges and problems. From security concerns to connectivity issues, there are several aspects that need to be addressed in order to ensure the smoothfunctioning of wireless networks. One of the major problems with wireless networks is the issue of security. With the increasing reliance on wireless technology for communication and data transfer, the risk of unauthorized accessand data breaches has also escalated. Hackers and cybercriminals are constantly looking for loopholes in wireless networks to gain access to sensitive information. This poses a serious threat to individuals and organizations, leading to potential financial losses and reputational damage. Therefore, it is crucial to implement robust security measures such as encryption, strong passwords, and regularsecurity updates to mitigate the risks associated with wireless networks. Another common problem with wireless networks is the issue of connectivity and signal strength. Despite advancements in technology, users often encounter dead zones or weak signals in certain areas, leading to dropped connections and slow internet speeds. This can be particularly frustrating in large buildings or remotelocations where the signal strength is inherently weaker. To address this issue, network administrators need to strategically place access points and repeaters to ensure seamless coverage throughout the designated area. Additionally, the use of advanced technologies such as beamforming and mesh networking can help improve signal strength and overall connectivity. Interference is another significant problem that plagues wireless networks. With the proliferation of wireless devices and IoT (Internet of Things) gadgets, the electromagnetic spectrum has become increasingly crowded, leading to interference and congestion. This can result in degraded network performance and reduced throughput, affecting the overall user experience. To mitigate interference, network administrators can employ techniques such as frequency management, channel bonding, and the use of advanced modulation techniques to optimize network performance and minimize interference. Furthermore, the rapid evolution of wireless technology often leads to compatibility issuesbetween different devices and standards. As new wireless standards such as 5G and Wi-Fi 6 emerge, older devices may struggle to keep up with the latest advancements, leading to compatibility issues and performance limitations. This can beparticularly challenging for organizations with a diverse range of devices and equipment. To address this problem, it is essential to conduct regularcompatibility tests and upgrades to ensure seamless integration of new deviceswith existing wireless networks. In addition to technical challenges, the human factor also plays a significant role in the effective functioning of wireless networks. User behavior, such as the improper configuration of devices, sharing of passwords, and negligence in following security protocols, can pose a seriousthreat to the overall security and stability of wireless networks. Educating users about best practices in wireless network usage and implementing strict access control measures can help mitigate these risks and ensure a secure and reliable wireless environment. Moreover, the increasing demand for bandwidth-intensive applications and services such as video streaming, online gaming, and cloud computing has put a strain on wireless networks, leading to congestion and performance issues. As the number of connected devices continues to rise, network administrators need to invest in scalable infrastructure and bandwidth management solutions to accommodate the growing demand for data-intensive applications. In conclusion, wireless networks have revolutionized the way we communicate and access information, but they also come with a myriad of challenges that need to be addressed. From security concerns to connectivity issues and compatibility challenges, there are several aspects that require careful consideration and proactive measures. By implementing robust security protocols, optimizing network infrastructure, educating users, and staying abreast of the latest technological advancements, we can overcome these challenges and ensure the seamless functioning of wireless networks in our increasingly connected world.。
Wireless Presentation System
特点：即插即用，操作简单，无线传输
Thank You
Wireless Presentation System
随着科技的革新，目前适用于大众的无线投影技术已经出现 1、无线投影设备可以和任何品牌投影机连接使用； 2、设备主要通过VGA、HDMI、USB连接； 3、设备本身就是一个无线AP，连接电源它即可发射无线信号 4、只要有无线网卡的笔记本即可无线连接，连接完成启动搭配的软件，输入登陆码 即可进行投影，无线投影的同时，亦可无线上网
Wireless tion System
2014.10
Agenda
•在用有线投影 •无线投影技术简介
Wireless Presentation System
目前我们经常是这样进行的投影 有时候我们会发现会议室的VGA线会变成这样（接头 针断了）
有线投影目前使用起来因为硬件条件的局限性造 成诸多不便，VGA线极易损坏，影响投影效果， 有线频繁的拔插容易造成接入端口错误，故障率 高
wireless networks presentation sample
– PAN – Personal Area Network
• Low-power, short-range network • Ranged up to 10 meters • Bluetooth, IR, …
Three Wireless Internets
PAN
10 meters
LAN
100 meters
Architecture Perspective
Wireless Networks
– WAN – Wide Area Network
• Ranged up to 2500 meters, GSM, GPRS, …
– LAN – Local Area Network
• Ranged up to 100 meters, 802.11b, …
3G Launching
Bandwidth & Time
Wireless Generations
3GWorldwide Wi Nhomakorabeaeless Application Forecast
Source:ARC Group 2001
Wireless Internet Application
Messaging – Use web phone to send SMS messages. Browsing – Use wireless devices to read cHTML, WML, HDML and XHTML web sites. Interacting – Use interactive applications for the client devices, such as wireless games. Conversing – Use Voice portal for information delivery, such as Tellme to get information from the voice gateway.
Wireless Networks
Wireless NetworksWireless networks have become an integral part of our daily lives, providing us with the convenience and flexibility to stay connected on the go. However, they also come with a myriad of challenges and issues that need to be addressed to ensure a seamless and secure experience for users. One of the most pressing problems with wireless networks is the issue of security. With the increasing prevalence of cyber attacks and data breaches, ensuring the security of wireless networks has become a top priority for individuals and businesses alike. From unauthorized access to sensitive information to the interception of data packets, the potential security threats associated with wireless networks are numerous and varied. As such, it is crucial for network administrators and users to implement robust security measures, such as encryption protocols and firewalls, to protect their wireless networks from malicious actors. Another significant problem with wireless networks is the issue of reliability and performance. While wireless technology has undoubtedly advanced over the years, it is still susceptible to interference from various sources, such as other electronic devices and physical obstacles. This can result in slow connection speeds, dropped signals, and overall poor network performance, which can be frustrating for users. Additionally, the increasing number of devices connecting to wireless networks, from smartphones and laptops to smart home devices and IoT gadgets, can put a strain on network bandwidth and lead to congestion issues. As such, network administrators need to carefully manage and optimize their wireless networks to ensure reliable and consistent performance for all users. Moreover, the problem of scalability poses a significant challenge for wireless networks, particularly in the context of expanding coverage and accommodating a growing number of users and devices. As the demand for wireless connectivity continues to rise, network administrators must find ways to scale their networks to support this increasing load without sacrificing performance or security. This may involve deploying additional access points, implementing advanced network management tools, and adopting emerging technologies such as 5G to meet the evolving needs of users. Furthermore, the issue of compatibility and interoperability can also pose a problem for wireless networks, particularly in heterogeneous environments where multiple devices withdifferent specifications and standards need to coexist. Ensuring seamless connectivity and communication between these devices can be a complex task, requiring careful planning and coordination to avoid compatibility issues and ensure a smooth user experience. Additionally, the rapid pace of technological advancements in the wireless networking industry can lead to obsolescence and compatibility challenges for older devices, further complicating the issue. In addition to these technical challenges, the problem of user education and awareness also deserves attention when it comes to wireless networks. Many users may not be aware of the potential security risks associated with wireless networks or the best practices for ensuring a safe and reliable connection. This lack of awareness can make them vulnerable to cyber threats and lead to inadvertent network misconfigurations that compromise the overall security and performance of the network. As such, there is a need for ongoing education and traininginitiatives to empower users with the knowledge and skills to effectively manage and secure their wireless networks. Moreover, the problem of regulatory compliance and governance also poses a challenge for wireless networks,particularly in the context of data privacy and protection. With the implementation of stringent data protection regulations such as GDPR and HIPAA, organizations must ensure that their wireless networks adhere to these regulatory requirements to avoid potential legal and financial repercussions. This may involve implementing data encryption, access controls, and auditing mechanisms to demonstrate compliance with these regulations and protect sensitive information transmitted over wireless networks. In conclusion, wireless networks bring with them a host of challenges and issues that need to be addressed to ensure a secure, reliable, and scalable experience for users. From security and performance to compatibility and regulatory compliance, these problems require careful consideration and proactive measures to mitigate their impact. By staying abreast of the latest technological advancements, implementing robust security measures, and educating users, network administrators can effectively tackle these challenges and provide a seamless wireless networking experience for all.。
Wireless Sensor Networks and Applications
Wireless Sensor Networks andApplicationsHere's a sample essay on "Wireless Sensor Networks and Applications" that meets your requirements: Wireless sensor networks (WSNs) have emerged as a transformative technology, revolutionizing data acquisition and environmental monitoring across diverse fields. Comprising numerous interconnected sensor nodes deployed over a geographical area, these networks offer unprecedented insightsinto the physical world, enabling real-time data collection, analysis, anddecision-making. This essay explores the fundamental aspects of WSNs, delving into their architecture, applications, and the challenges they present. A typical WSN comprises numerous sensor nodes, each equipped with sensing, processing, and communication capabilities. These nodes, often battery-powered and resource-constrained, collaborate to gather environmental data such as temperature, humidity, pressure, light, and motion. The collected information is then transmitted wirelessly through the network, often employing multi-hop communication, until it reaches a central processing unit called the sink node. The sink node serves as the gateway between the WSN and external systems, allowing for data analysis, storage, and visualization. The applications of WSNs are vast and rapidly expanding, spanning various sectors, including environmental monitoring, healthcare, industrial automation, and agriculture. In environmental monitoring, WSNs play a crucial role in observing and predicting natural disasters, assessing air and water quality, and tracking wildlife movement. In healthcare, wearable sensor networks monitor patients' vital signs, providing valuable datafor diagnosis and treatment. Industrial automation benefits from WSNs through improved efficiency, real-time equipment monitoring, and predictive maintenance. Agricultural applications include precision farming techniques, optimizing irrigation, and monitoring crop health. Despite their transformative potential, WSNs face inherent challenges. Energy efficiency remains a significant concern, as sensor nodes rely on limited battery power. Efficient energy management protocols are crucial to prolong network lifetime. Scalability is another challenge, as expanding network size introduces complexity in data routing and networkmanagement. Security is paramount, safeguarding sensitive data from unauthorized access and malicious attacks. Robust security mechanisms are essential to ensure data integrity and privacy. Data aggregation and processing present further hurdles, as vast amounts of data require efficient techniques for filtering, compression, and analysis. Addressing these challenges requires innovative solutions and ongoing research efforts. Energy harvesting techniques, utilizing ambient sources like solar and wind power, hold promise for extending network lifespan. Advanced routing protocols, such as clustering and geographic routing, aim to enhance scalability and reduce energy consumption. Cryptographic methods and secure communication protocols are crucial for ensuring data confidentiality and integrity. Data aggregation algorithms play a vital role in summarizing and extracting meaningful insights from the collected data. The future of WSNs is brimming with potential. Advances in nanotechnology, miniaturization, and energy harvesting promise to create even smaller, more energy-efficient sensor nodes. Integration with the Internet of Things (IoT) will further enhance thecapabilities of WSNs, enabling seamless connectivity and intelligent data processing. Machine learning and artificial intelligence will play increasingly important roles in extracting valuable insights from the vast datasets generated by WSNs, facilitating data-driven decision-making across various domains. In conclusion, wireless sensor networks stand at the forefront of technological innovation, offering unprecedented opportunities for understanding and interacting with the physical world. As research and development efforts continue, WSNs are poised to become increasingly ubiquitous, transforming industries and revolutionizing our daily lives. From environmental monitoring to healthcare and beyond, the applications of WSNs are boundless, promising a future where data-driven insights empower us to create a smarter, more sustainable world.。
Wireless Networks
Wireless NetworksWireless networks have become an integral part of our daily lives, enabling us to stay connected and access information on the go. With the advancement of technology, the use of wireless networks has grown exponentially, providing convenience and flexibility to users. However, like any technology, wireless networks come with their own set of challenges and considerations. One of the main advantages of wireless networks is the convenience they offer. With wireless connectivity, users can access the internet from anywhere within the network's range, without the need for cumbersome cables. This flexibility allows for increased productivity and efficiency, as users can work or communicate on the go. Additionally, wireless networks enable the connection of multiple devices to the same network, allowing for seamless communication and collaboration among users. Despite the convenience and flexibility that wireless networks provide, there are also security concerns that must be addressed. Wireless networks are susceptible to various security threats, such as unauthorized access, data interception, and malware attacks. It is crucial for users to implement robust security measures, such as encryption, strong passwords, and regular software updates, to protect their data and privacy while using wireless networks. Another consideration when using wireless networks is the issue of network congestion. As more devices connect to the same network, the available bandwidth is divided among them, potentially leading to slower connection speeds and decreased performance. This can be especially problematic in crowded areas or during peak usage times. To mitigate network congestion, network administrators can implement quality of service (QoS) policies to prioritize certain types of traffic and ensure a smooth user experience. In addition to security and network congestion, another challenge of wireless networks is the limited range of signal coverage. Wireless signals can be affected by various factors, such as obstacles, interference, and environmental conditions, which can reduce the range and reliability of the network. Users may experience dropped connections or slow speeds if they are too far from the wireless access point. To address this issue, users can invest in signal boosters or mesh network systems to extend the range of their wireless network and improve connectivity throughout their home or office. Overall,wireless networks offer numerous benefits and conveniences, but they also come with their own set of challenges and considerations. By implementing security measures, managing network congestion, and addressing signal coverage issues, users can optimize their wireless network experience and enjoy seamless connectivity on the go. As technology continues to evolve, it is important for users to stay informed and proactive in managing their wireless networks to ensure a safe and reliable connection.。
Wireless Networks
Wireless NetworksWireless networks have become an integral part of our daily lives, providingus with the convenience and flexibility to stay connected anytime and anywhere. However, as with any technological advancement, wireless networks come with their own set of challenges and problems. From security concerns to connectivity issues, there are several factors that can impact the performance and reliability of wireless networks. One of the most pressing problems with wireless networks isthe issue of security. With the increasing prevalence of cyber attacks and data breaches, ensuring the security of wireless networks has become a major concernfor individuals and businesses alike. Hackers can easily intercept wirelesssignals and gain unauthorized access to sensitive information, putting personaland financial data at risk. As a result, there is a growing need for stronger encryption protocols and security measures to protect wireless networks from potential threats. Another common problem with wireless networks is the issue of connectivity and coverage. While wireless technology has made it possible to access the internet from virtually anywhere, there are still areas with poorsignal strength and limited coverage. This can be particularly frustrating for individuals who rely on wireless networks for work or communication, as they may experience dropped calls, slow internet speeds, and inconsistent connectivity. As such, there is a need for ongoing infrastructure improvements and investments to expand wireless coverage and improve network reliability. In addition to security and coverage issues, wireless networks also face challenges related tointerference and congestion. With the proliferation of wireless devices and technologies, such as smartphones, tablets, and IoT devices, the airwaves have become increasingly crowded, leading to interference and congestion problems. This can result in degraded network performance, slower data speeds, and reducedoverall efficiency. To address this issue, there is a need for better spectrum management and the development of advanced technologies to mitigate interference and optimize wireless network performance. Furthermore, the rapid advancement of wireless technology has also led to concerns about the potential health effects of prolonged exposure to electromagnetic radiation. While the scientific communityhas yet to reach a consensus on the long-term health impacts of wireless radiation,there is a growing public awareness and concern about the potential risks. As such, there is a need for ongoing research and education to better understand the health implications of wireless technology and to develop guidelines for safe usage. Moreover, the increasing reliance on wireless networks for critical applications, such as telemedicine, autonomous vehicles, and smart infrastructure, has raised concerns about the resilience and reliability of wireless communication. In the event of natural disasters, cyber attacks, or other emergencies, the ability of wireless networks to maintain connectivity and support essential services becomes paramount. Therefore, there is a need for robust disaster preparedness and contingency planning to ensure the continuity of wireless communication during unforeseen events. In conclusion, while wireless networks have revolutionized the way we communicate and access information, they are not without their challenges and problems. From security and coverage issues to interference and health concerns, there are several factors that need to be addressed to improve the performance and reliability of wireless networks. By investing in research and development, implementing stronger security measures, and expanding infrastructure, we can work towards overcoming these challenges and ensuring that wireless networks continue to meet the evolving needs of society.。
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Web Phones & Handhelds
Web Phones – It is a modified cell phone with display hardware and Internet access software. – Japanese use color I-mode phones. – Europeans use WAP phones for messaging. Handhelds / PDA – It is a small computer with OS, storage, screen, keyboard and wireless connection interfaces (IrDA infrared) or Bluetooth (Short-range radio) – With wireless modem, we can sync over the air.
Infrared Technology
It is a popular way for handhelds to exchange data, typically range of 2M. They are often used to manually exchange information using strictly a point-to-point connection. IrDA v1.0 transmits data at 115 kbps. IrDA v1.1 transmits data at 4 Mbps.
WAP Phones WAN Tower
WAP Gateway
Server
LAN Topology
Base Station
Handhelds
Server Database
PAN Topology
Handhelds
WAP Phones
Wireless PAN module
LAN & PAN
LAN
1G
FDMA Frequency Division Multiple Access 1980s – each calling party is allocated a dedicated frequency channel: 3 users use three channels
2G
TDMA & GSM Time Division Multiple Access & Groupe Speciale Mobile 1990s – callers timeshare a frequency channel: nine users use 3 channels
Web PCs & Appliance
Appliance – iAppliances stand for Internet appliances refer to specialized gadget designed as a single application. – Webpad, WebTV, …
Bluetooth
Bluetooth is the name for a short-range radio frequency (RF) technology that operates at 2.4 GHz and is capable of transmitting voice and data. Bluetooth is an industrial specification for wireless personal area networks The name Bluetooth was born from the 10th century king of Denmark, King Harold Bluetooth
Summary
Devices Web Phone Handheld Pager Voice Portal Web PC Communicating appliances Networks WAN LAN PAN Applicatons Messaging Web Browsing Interacting Conversing
The Equipments / devices
What are the advantages and disadvantages of using the following devices? – Web Phone – Handheld – Pager – Web PC – Appliance
Pagers & Voice Portals
Pagers – A small wireless device that uses paging networks to send and receive data. – Paging belongs to messaging applications. – Pagers are ideal as cheap and low-power. Web PCs – PC and even laptop are poor mobile devices, need to put near a power supply. – Tablet PC, lightweight, easy to hand over.
– PAN – Personal Area Network
• Low-power, short-range network • Ranged up to 10 meters • Bluetooth, IR, …
Three Wireless Internets
PAN
10 meters
LAN
100 meters
WAN
2500 meters
Personal Area Network
1-20 Mbps
Local Area Network
11-54 Mbps
Wide Area Network
9-144 Kbps
WAN Topology
Wireless Network Wired Network
Internet Telco Switch Database
2.4 GHz 11 Mbps 100 meters
PAN
2.4 GHz 700 Kbps 10 meters
WPAN Comparisons
Speed / Distance
Speed 54Mbps 18Mbps 11Mbps 180m 570m
Indoor 20m 75m 125m 125m
Wireless History
First wireless experiments – 1888: Heinrich Hertz – spark generator – 1894: Guglielmo Marconi – send radio across across the Atlantic Broadcast radio – 1920 Photographs transmitted by radio – 1924 Mobile Radio to Police Cars – 1926 Broadcast Television (B/W) – 1936 The first automatic radiotelephone service - 1948
3G Network Evolution
3G
CDMA & WCDMA Code Division Multiple Access & Wide CDMA 1990s – callers use a shorter bandwidth 2000s – Each call is spread, randomly broken down and mixed: ten callers use one channel.
Wireless Networks
Outline
Introduction: From Wired to Wireless Wireless Devices – Smart Phones, Handhelds, Pagers, … Wireless Networks – WAN, LAN, PAN How do they work? Wireless Internet Architectures – 2G, 2.5G, 3G, 4G, Bluetooth, IR, Satellites? … Wireless Internet Applications The Future of Wireless Technology
Introduction
The wireless Internet is the network of radioconnected devices and servers using voice, information and other Internet services. Two billion wireless mobile users will exist by the year 2011. Almost every Internet service is being made ready for the wireless Internet.
Wireless Network Applications
Hardware Perspective – The Equipments / devices – Wireless Spectrum Architecture Perspective Informative Perspective Application Perspective
Wireless History
Satellite Systems for Telephony – 1962 The Shoe Phone - 1965 First Cellular Mobile Phone – 1973 Pagers (widely used) – 1985, …