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CONNECTIVITY

CONNECTIVITY. What it is? What you need to know? Why you need to know it?. What is Connectivity? . Connectivity is how you are physically connected to the Internet. Many different options are available. Must do a cost-benefit analysis for the different technologies: Price vs. Bandwidth

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CONNECTIVITY

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  1. CONNECTIVITY What it is? What you need to know? Why you need to know it?

  2. What is Connectivity? • Connectivity is how you are physically connected to the Internet. • Many different options are available. • Must do a cost-benefit analysis for the different technologies: Price vs. Bandwidth • Bandwidth = Speed

  3. Transmission Technologies • POTS (Plain Old Telephone Service) • ISDN (Integrated Services Digital Network) • T1/T3 • DSL (Digital Subscriber Line) • Cable Modem • Fiber Optic • Wireless • Satellite

  4. POTS (Plain Old Telephone Service) • Cheapest Alternative: free installation, $20 per month. • Slowest alternative: 53Kbps at best • Must have an analog phone line for each dial-up connection.

  5. ISDN (Integrated Services Digital Network) • Runs on existing phone cable. • Installation cost of ~$100-150. Monthly rate: ~$50-60 • Runs at 128 Kbps.

  6. T1/T3 • Set-up fee: ~$200-300 Monthly cost: $400-2000. • Direct, always-up connection to the internet. • High speed.T1 = 1.544 MbpsT3 = 44.736 Mbps

  7. DSL (Digital Subscriber Line) • Runs over existing phone lines. • Different kinds. Two types are SDSL and ADSL. • Initial set-up: ~$500. • 1.1 Mbps: ~$250/mo. • Not available in all areas.

  8. Cable Modem • Runs over coaxial cable. • Set-up cost: ~$150 Monthly cost: ~$50 • Uplink: 128 KpbsDownlink: to 2 Mbps • Not available in all areas.

  9. Fiber Optic • Highest speeds of any connection:OC1 = 51.84 Mbps • Cost prohibitive: > $3-4 / ft to install, assuming right-of-way

  10. Wireless • One-time set-up cost: ~$4000-5000. • No recurring cost (equipment is owned) • Speeds up to 11 Mbps and increasing (depends on distance). • Needs line of sight.

  11. Satellite • Virtually eliminates geography issue. • Upload via telephone, download via satellite. • 400 Kbps downlink = ~$50-100 / mo. • Newer technology allows satellite uplink, but cost is higher.

  12. Putting Technologies Together • You don’t have to use only one technology! • Different connectivities have different characteristics. Use the one best suited for a particular situation. • Keep in mind the bottleneck effect – a chain is only as fast as its slowest link.

  13. Jasper County Network

  14. Randolph/Clay/Stewart/Quitman

  15. Rural to Urban Connectivity

  16. Applications Approach • Determine key technologies to be addressed • Computers connected by Ethernet for high tech residents • TV and phone, web TV, videoconference, etc. for tech-learners • Design wiring infrastructure for general needs and determine capabilities provided • Identify technology and software applications, networking requirements to implement • Evaluate cost, determine feasibility

  17. Application Data Rate Requirements • Reasonable quality 2-way video will require between 120-300 kbps bandwidth (H.323) • Video Streaming, if buffered (delayed) can be supported by as little as 20 kbps • Real-time, increased resolution video streaming will require 100-300 kbps and up • Virtual reality requires > 100 kbps & lots of RAM • Administrative (highly variable -- may require alternative network)

  18. QUESTIONS?

  19. Demonstration

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