communications and networks

309 views

Published on

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
309
On SlideShare
0
From Embeds
0
Number of Embeds
2
Actions
Shares
0
Downloads
0
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

communications and networks

  1. 1. Communications andNetworksLecture 23Zikria Mian
  2. 2. • Computer communication– A process in which two or more computers ordevices exchange data, instructions andinformation.– For successful communications, following arerequired• Sending device• 2 Communication devices• Communication channel• A receiving device
  3. 3. • Most computer users require asubscription to an internet service provider• An organisation may providecommunication services to employees,students, customers etc
  4. 4. Previously discussed uses ofcommunication• E-mail• Instant messaging• Chat rooms• Newsgroups• Blogs• Wikis• RSS• VoIP• FTP• Video conferencing etc
  5. 5. Other uses of communication• Wireless messaging service– Text messaging– Instant messaging– Multimedia messaging• Wireless internet access points– A ‘Hot spot’– Mobile wireless network
  6. 6. • Global positioning system (GPS)– A navigation system that consists of one ormore receivers that accept and analysesignals sent by satellites, mainly fordetermining geographical location• Collaboration– Collaborative software e.g. Acrobat connect,Microsoft Office Live Meeting etc– Via e-mail– Document management system e.g. googledocs
  7. 7. • Voice Mail• Web Services– Software to communicate with other remotecomputers– Business usage– Personal usage
  8. 8. Networks• A network is a collection of computers anddevices connected together viacommunication devices and transmissionmedia– Network can be internal to an organisation orworldwide through internet
  9. 9. Advantages• Facilitating communications• Sharing hardware• Sharing data and information• Sharing software• Transferring funds
  10. 10. Types of Networks• Local Area Network (LAN)• Metropolitan Area Network (MAN)• Wide Area Network (WAN)• 802.11 (Wi-Fi)– Wireless ethernet standard– Wi-Fi mesh network• Bluetooth• UWB
  11. 11. • IrDA (line of sight transmission)• Radio Frequency Identification (RFID)• Worldwide Interoperability for MicrowaveAccess (WiMax)• Wireless Access Protocol (WAP) andGeneral Packet Radio Service (GPRS)
  12. 12. Communications Software• Help users to establish connection withanother computer or network• Manage the transmission of data,instructions and information• Provide an interface for users tocommunicate with one another
  13. 13. Transmission Media• Physical Media– Twisted-pair cable– Coaxial cable– Fiber-optic cable• Wireless Media– Infrared– Broadcast Radio– Cellular radio– Microware radio– Communication satellite

×