1 / 24

C7- Telecommunications, The Internet, and Wireless Technology

C7- Telecommunications, The Internet, and Wireless Technology. Networking and Comm. Trends. A networking and communications revolution led by Internet-based technologies Convergence of telephone and computer networks

yuma
Télécharger la présentation

C7- Telecommunications, The Internet, and Wireless Technology

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. C7- Telecommunications, The Internet, and Wireless Technology

  2. Networking and Comm. Trends • A networking and communications revolution led by Internet-based technologies • Convergence of telephone and computer networks • Voice and data communication networks are becoming faster, more portable, and less expensive Telecommunications and Networking in

  3. What is a computer network? • Consists of two or more connected computers • Each computer contains a network interface card (NIC)‏ • The connection medium • telephone wire, coaxial cable, or radio signal in the case of cell phone and wireless local area networks • Network Operating System (NOS)‏ • Routes and manages communications on the network and coordinates network resources • Dedicated server computer • Hubs • Routers 7-3

  4. What is a computer network? ... • Most networks contain a switch or a hub acting as a connection point between the computers • Hubs are simple devices that send packets of data to all other connected devices • Switches can filter and forward data to specified locations with some intelligence • Routers send packets of data though different networks 7-4

  5. A Simple Network • Where is the • Client computers • Network operating system • Server computer • Cable (wiring) • Network interface cards (NICs) • Switches, and a router. Figure 7-1 7-5

  6. Corp. Network Infrastructure 7-7

  7. Client/Server Computing • A distributed processing model • some processing power is located within small, inexpensive client computers • The clients are linked to one another • The network is controlled by a network server computer • The server sets the rules of communication for the network • provides every client with an address so others can find it on the network 7-8

  8. Packet Switching Key Digital Network Technologies Message broken down to packets Sent through different communication path Reassembled at destination 7-9

  9. TCP/IP Protocol Key Digital Network Technologies • TCP/IP uses a suite of protocols: • TCP: Transmission Control Protocol – establish a connection • IP: Internet Protocol – handles delivery of packets • set of rules governing transmission of information- used by and all Internet devices • TCP/IP provides for breaking up digital messages into packets, routing them to the proper addresses, and then reassembling them into coherent messages

  10. Communications Networks A WAN may take on a derivative name such as MAN (metropolitan area network) simply to describe its physical location. 7-17

  11. The Global Internet • It is a network • Links hundreds of thousands of individual networks all over the world • Composed of computers and other devices that are logically linked together by a unique address space based on Protocol • Where devices are able to support communications using TCP/IP • That provides high-level services layered on a communication and network infrastructure • Most homes connect to the Internet by subscribing to an Internet Service Provider (ISP)‏ 7-25

  12. Internet Services & Comm. Tools • E-mail: Person-to-person messaging; document sharing • Usenet newsgroups: Discussion groups on electronic bulletin boards • Chatting and instant messaging: Interactive conversations • VOIP: • Telnet: Logging on to one computer system and doing work on another • FTP: Transferring files from computer to computer • World Wide Web: Retrieving, formatting, and displaying information (text, audio, video, graphics) using hypertext links 7-30

  13. Internet Features • Hypertext • Standard for Web pages HTML • Web browsers request web pages using HTTP protocol • Searching information • Search engines • Intelligent agents shopping bots • Web logs (blogs)‏ • Semantic web

  14. Technologies And Tools For Communication And E-business Intranets and Extranets Virtual Private Networks (VPN) A private network configured within a public network to take advantage of economies of scale and facilities of larger networks Secure connection between two points on Less expensive, more flexible, greater bandwidth than non-IP networks • Intranet: • an internal organizational network that provides access to data across the enterprise • Protected from public visits by firewalls • Extranet: • Authorized visitors (vendors, customers) are given limited access to an internal intranet

  15. The Wireless Revolution • Mobile phones are now platforms for delivering digital data, used for recording and downloading photos, video and music, Internet access, and transmitting payments • An array of technologies provides high-speed wireless access to for PCs and other wireless handheld devices and cell phones • Businesses increasingly use wireless to cut costs, increase flexibility, and create new products and services

  16. Wireless Transmission Media and Devices • All wireless media rely on various parts of the electromagnetic spectrum • Microwave systems transmit high-frequency radio signals through the atmosphere • Communication satellites are used for geographically dispersed organizations • Blackberry: email handheld • PDAs: small handheld computers • electronic scheduler • Cellphones: use radio waves to communicate with towers in cells • message passed from cell to cell • Smartphones: can save information, access Internet

  17. Mobile Wireless Standards for Web Access • Wireless Application Protocol (WAP): Uses Wireless Markup Language (WML) and microbrowsers • Bluetooth • Creates small Personal Area Networks (PAN) • Can link up to 8 devices in 10-m area • Low power requirements

  18. Wi-Fi • Three standards: 802.11a, 802.11b, 802.11g • Infrastructure mode: Devices use access point to communicate with wired network • Ad-hoc mode (peer-to-peer): Wireless devices communicate directly with each other • Benefits of Wi-Fi • Low-cost to provide Internet access to conference rooms, workstations • Allows hot-spots in public areas such as university campuses, airports … • Challenges • Security • Susceptibility to interference

  19. An 802.11 Wireless LAN

  20. How RFID Works

  21. Wireless in Heath Care • Electronic Medical Record (EMR) retrieval • Wireless note taking for patient charts • Lab test results • Prescription generation • Medical databases

  22. Wireless Technology In The Enterprise • Pervasive Computing • Wireless technologies are pushing computing into every facet of life, including cars, homes, office buildings, tools and factories; providing connections anywhere and anytime • Wireless sensor networks (WSNs) • Networks of interconnected wireless devices that are embedded into the physical environment to provide measurements of many points over large spaces

More Related