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Characteristics of communication links

Characteristics of communication links. Skills : none IT concepts : data transmission rate, latency, jitter, packet loss, medium. This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License. Characteristics of communication links. Internet concepts

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Characteristics of communication links

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  1. Characteristics of communication links Skills: none IT concepts: data transmission rate, latency, jitter, packet loss, medium This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License.

  2. Characteristics of communication links • Internet concepts • Applications • Technology (connectivity) • Implications for • Individuals • Organizations • Society • Internet skills • Application development • Content creation • Text • Image • Audio • Video

  3. Link characteristics • Speed • Latency • Jitter • Packet loss rate • Medium

  4. Do you know the speed of the link between your home and your ISP? Home LAN The Internet LAN router ISP router

  5. What is the unit of measure for data transmission speed?

  6. What is the unit of measure for data transmission speed?

  7. Verizon Internet plans, November 2009 Note that speeds are “up to” these rates. Note the asymmetry in upload and download speed.

  8. Prefixes for large quantities After these prefixes come exa, zetta and yotta. The pattern continues -- each is 1,024 times the previous one.

  9. Availability of 100 Mbps service in 2009 Follow this link for 100 Mbps cost.

  10. Latency – the time for the first packet to arrive About half the ping (round trip) time

  11. Jitter – variation in latency

  12. Ping time and jitter from Los Angeles

  13. Packet loss rate No packets lost -- packet loss is rare, but occurs

  14. Packet loss rate from SLAC (Palo Alto, CA) • Steady improvement everywhere but Africa • All regions but Africa an parts of Asia are now under 1%

  15. Current year data on Verizon backbone latency, packet loss rate and jitter http://www.verizonbusiness.com/about/network/latency/

  16. Transfer rate from SLAC (Palo Alto, CA)

  17. Link medium Copper, twisted pair Copper, coaxial cable Fiber Terrestrial radio Satellite radio

  18. We just covered five characteristics of a communication link. Do you recall what they were?

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