Communication technology


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  • perfect for level 3 students working on unit 33 communications technology in Business for BTEC extended Diploma
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Communication technology

  1. 1. Suggested by Respected Shakti Ma’am Created /Edited by Abhishek (XI)
  2. 2. Contents Network  Needs For Networking Data Communication Protocol Communication protocol  Protocol  Functions Of Protocol Types Of Network  LAN’ s  MAN’ s  WAN’ s Difference Between LAN And WAN
  3. 3.  There are two other types of network PAN - Personal Area Network CAN – Campus Area Network INTERNET  Main components of internet  Types of INTERNET Connection  Modem  Analog and digital Signal INTRANET Network topologies  Star Topology  Bus Topology  Ring Topology Networking Technologies  Wired Networking Technology  Co- axial cable  Ethernet cable
  4. 4. Fibre Optic Cable  Wireless Networking Technology  Bluetooth  Infrared  Wi-Fi
  5. 5. Network A network is a collection of two or more computers connected to each other. Needs For Networking Share information Share hardware and software Centralize administration and support  You can play a CD music from one computer by sitting on another computer. You can connect a printer to one computer and let others computers of the network print on that printer . You can create files and store them in one computer and then access those files from the other computers connected to it.
  6. 6. Communication protocol When peoples are connected through internet there is a key concept how data move between two computers. Protocol Set of rules for safe movement of data on the internet are called protocols. Protocols governs the sending and receiving of data on the internet . The two main protocols are TCP - Transmission Control Protocol IP - Internet Protocol Collectively these protocols are called TCP and IP. Function of protocol Functions of TCP- Break the data into smaller data packets for error free data transmission . Functions of IP - Transport these data packets into their correct destination.
  7. 7. Types Of Network Computer network s are three types - LAN [Local Area Network] MAN [Metropolitan Area Network] WAN [ Wide Area Network]
  8. 8. LAN LAN’s are small network . LANS cover houses buildings college campus organization . Transmission media –coaxial cables.
  9. 9. MAN MAN is usually a middle way of LAN and WAN over and area of around 5 to 50 km. transmission media –coaxial cables and telephone lines .
  10. 10. WAN WANS are large network. WAN covers city, region . Transmission media telephone lines, microwaves, satellites, Links. WAN is also known as internet.
  11. 11. DIFFERENCE BETWEEN LAN AND WAN LAN WAN 1) Large Area Network 2) Smaller Networks 3) Cover Houses Buildings Organizations Etc . 4) Transmission Media in LAN is coaxial cable. 5) Low cost 6) Transmission speed in LAN is 0.1 to 100 Megabytes /sec {mbps} 1) Wide Area Network 2) Large Networks 3) Covers City Region Etc . 4) Transmission Media In WAN Is Telephone Lines Microwaves Satellites Links Etc. 5) High Cost 6) Transmission Speed In Wan Is 1800 To 9600 Bits /Sec {Bps}.
  12. 12. There are two other types of network PAN - Personal Area Network CAN - Campus Area Network INTERNET Global collection of peoples computer data and information which are linked together by cables and telephone lines. Global collection of inter connected networks {Group of computers connected to WAN}
  14. 14. TYPES OF INTERNET CONNECTION  Dial Up Connection – Usually Telephone Lines Are Used.  Leased Line Connection – Special Kind Of Telephone Lines Are Available To The User All The Time. User Does Not Require To Dial Number And Wait For Connection Establishment For The Internet. Leased Line Connections Are Faster And Expensive Than Dial Up Connections . MODEM It is a modulation and a de-modulation device. Modulation
  15. 15. Analog Signal And Digital Signal Analog signal – analog signal may take any value with in a given range of values. Digital signal - digital signal may take on discrete set of values.
  16. 16. INTRANET An intranet is a private network having internet type tools, But available only within that organization. Network Topologies The physical layout of the network is called network topology.
  17. 17. There are three types of network topology 1. Star Topology – in star topology a number of work stations.(NODES) are directly linked to a central nodes. There is bi directional communication between various nodes. The central node controls all the activities of nodes. 2. Break down of one node does not affect any other nodes on the network. 3. Failure of the central node disables communication throughout the whole network.
  18. 18. Bus Topology – In bus topology all workstations (nodes) are connected to a single communication line is called BUS. In this type of topology there is no central node as in star topology. If one workstation fails it does not effect the entire system.
  19. 19. Ring Topology – In ring topology each work stations is attached to near by station point to point basis so the entire system is in the form of ring. Breakdown of any one node on the ring disable the entire system. Data packets circulate in either clock wise or anti clock wise direction.
  20. 20. Networking Technologies Networking TECHNOLOGIES can be viewed in two ways by wired Or wireless media . Wired networking technology – cables are used in wired medias.
  21. 21. Commonly used cables are - Co axial cable ( Oliver Heaviside ) It is an electrical cable with an inner conductor covered by an insulating layer. The insulating layer is surrounded by thin insulating layer. It is called co- axial cable because the inner conductor and outer shield share the same geometric axis.
  22. 22. Ethernet Cable Ethernet is a family of computer networking technologies for local area networks(LANs). Ethernet was commercially introduced in 1980 and standardized in 1985 as IEEE 802.3. Ethernet has largely replaced competing wired LAN technologies. Systems communicating over Ethernet divide a stream of data into shorter pieces called frames. Each frame contains source and destination addresses and error- checking data so that damaged data can be detected and re-transmitted.
  23. 23. Fiber optic cable (Optical fiber cable) An optical fiber cable is a cable containing one or more optical fibers. The optical fiber elements are typically individually coated with plastic layers and contained in a protective tube suitable for the environment where the cable will be deployed.
  24. 24. Wireless network Wireless network refers to any type of computer network that uses wireless (usually, but not always radio waves) for network connections. It is a method by which homes, telecommunications networks and enterprise (business) installations avoid the costly process of introducing cables into a building, or as a connection between various equipment locations. Wireless telecommunications networks are generally implemented and administered using radio communication. This implementation takes place at the physical level (layer) of the OSI model network structure.
  25. 25. Bluetooth Bluetooth is a wireless technology standard for exchanging data over short distances (using short-wavelength radio transmissions in the ISM band from 2400–2480 MHz) from fixed and mobile devices, creating personal area networks (PANs) with high levels of security. Created by telecom vendor Ericsson in 1994,it was originally conceived as a wireless alternative to RS-232 data cables. It can connect several devices, overcoming problems of synchronization.
  26. 26. Infrared Infrared networking enables computing devices to send and receive data wirelessly within a short range using infrared beams. Devices with infrared can be recognized by the infrared port that is visible on the side of the product which is used to detect and send the infrared beams. Transmission speeds up to 16 Mbit/s.
  27. 27. Wi-Fi Wi-Fi (also spelled Wifi or WiFi) is a popular technology that allows an electronic device to exchange data wirelessly (using radio waves) over a computer network, including high-speed Internet connections. The Wi-Fi Alliance defines Wi-Fi as any "wireless local area network(WLAN) products that are based on the Institute of Electrical and Electronics Engineers' (IEEE) 802.11 standards".