1 / 15

7/12: Ch. 6 Telecommunications

7/12: Ch. 6 Telecommunications. Business Value of Telecommunications Trends Industry Technology Application Internet applications Network models WANs, LANs, Internetworks, Intranets, Extranets, Client/Server, Interorganizational. Business Value. How businesses use telecommunications

carlow
Download Presentation

7/12: Ch. 6 Telecommunications

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. 7/12: Ch. 6 Telecommunications • Business Value of Telecommunications • Trends • Industry • Technology • Application • Internet applications • Network models • WANs, LANs, Internetworks, Intranets, Extranets, Client/Server, Interorganizational

  2. Business Value • How businesses use telecommunications • enterprise collaboration • electronic commerce • internal business • Business Value of Telecommunications • overcoming barriers: geographical, time, cost, structural

  3. Trends • Industry • increased number of suppliers • deregulation act create more suppliers • Technology • Open systems increase connectivity • Digital overtakes analog • Wireless • Application • applying telecommunications to every aspect of busines

  4. Internet Applications • origins: ARPANET – Defense Dept. project • WWW – Tim Berners-Lee at CERN (Switz.) • Email • Usenet (newsgroups) • IRC (chat rooms, AIM) • FTP • Telnet

  5. Network Models • basic model: • terminal – processor – channel – processor – terminal • includes software at most points

  6. Network Models • WAN – Wide Area Network • LAN – Local Area Network • network servers, shared peripherals, etc. • Internetworks – Networked LANs • using processors: switches, routers, hubs, gateways • Intranets & Extranets – WWW for internal & external use -- VPNs • Client/Server – applications reside on server • client programs reside on terminals (PCs)

  7. Part 2: Alternatives • Media choices • Twisted pair, coaxial cable, fiber optics, microwaves, satellites, cellular phone systems, wireless LANs • Processors • Modems, multiplexers, internetwork processors • Software – common functions • Network Topologies • Star, bus, ring • Architecture & Protocols • TCP/IP, OSI

  8. Media Choices • Twisted Pair Wire • telephone wire • Coaxial Cable • cable TV • Fiber Optics • glass fibers use light to transmit data images courtesy of mag-nify.educ.monash.edu.au,www.mars-cam.com, 3Com.com

  9. Media Choices • Terrestrial Microwaves • line-of-sight up to 30 miles apart • Communication Satellites • DirectPC, DirectTV • Cellular Phone Systems • Wireless LANs • radio, infrared images courtesy of mitsubishi.com

  10. Processor Choices • Modems • Analog modems (telephone) • ISDN, Cable, DSL modems • Multiplexers • allow multiple users on same channel • FDM, TDM, STDM • Internetwork Processors • switches, hubs - complete connections • routers, gateways – interfaces for networks image courtesy of 3Com

  11. Software • Access control • autodialers, log-ins, etc. • Transmission control • error checking (parity checking) • transmission of data, etc. (often file transfer) • Network management • prioritizes traffic on network • prevents (or deals with) data collisions, etc. • Security management • includes encryption, access validation

  12. Network Topologies • nodes, hubs, backbones, servers • Star • central server control • Bus • like a highway • Ring • control gets handedoff from node to node

  13. Architecture & Protocols • circuit-switched networks • telephone conversation: whole circuit reserved • packet-switched networks • shared passages, packets of information being sent • Internet: packet-switched (ex. TCP)

  14. Internet Protocol (IP) • address: 4 separate 3-digit numbers separated by periods • looking up IPs at Internic.net • URLs are used to look up IP addresses at Domain Name Servers (DNS) 165.134. 1 . 25 209.145.150. 10

  15. Transmission Control Protocol (TCP) • breaks message into manageable chunks and sends them separately • like packing up a house’s contents to move #1 #2 #3 big file #4 #5 #6 #7 #8 #9

More Related