1 / 19

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

randy
Télécharger la présentation

CONNECTIVITY

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. 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

More Related