Skills: none Concepts: mobile, home and organization connectivity, local versus wide area network, wired versus wireless, cell versus WiFi, terrestrial.

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Presentation transcript:

Skills: none Concepts: mobile, home and organization connectivity, local versus wide area network, wired versus wireless, cell versus WiFi, terrestrial versus satellite wireless, connectivity options within the LAN, from the LAN to the ISP and backbone networks, network topologies This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License. Connectivity overview

Where does this topic fit? Internet concepts – Applications – Technology (communication) – Implications Internet skills – Application development – Content creation – User skills Backbone

Connectivity from three types of location Home Mobile Organization

LAN Home or organization Mobile Internet service providers What company is your mobile ISP? Your home ISP? Your work ISP?

mobile user Mobile connectivity How does the mobile user connect to the Internet? the Internet

The path to the Internet What would slow the connection? Radio Fiber Internet

Radio Fiber Internet Distance Congestion

Cell radios & towers

What is your usage pattern? Do you use more voice or data? Most mobile traffic is Internet data Total monthly mobile traffic (petabytes), Ericsson, Feb 2014

the InternetLAN Home and organization connectivity 1. How does the LAN connect to the Internet? 2. How are computers connected inside the LAN? Two questions – think about the answers before continuing.

Copper (DSL or CATV), Fiber or wireless the InternetLAN Connection between LAN and ISP

This antenna is used for a radio link to an ISP in Austin Texas. There are many wireless ISPs in rural areas. When do we use terrestrial wireless?

When do we use satellite connectivity?

Connectivity inside the LAN What are LAN wired and wireless connectivity protocols? How does your cell phone connect when you are home or at a Starbucks store?

Most common inside the LAN WiFi Ethernet

Connecting the wide area networks How are the ISP’s networks connected to each other?

CSUDH LANCALREN WAN Optical fiber My university connects to a state-wide WAN

The NSF backbone, 1986

Which parts of the earth are least/most connected to the Internet? High speed fiber between cities Telegeography interactive global submarine cable map

Undersea cables Which parts of the earth are least/most connected to the Internet? Interactive mapInteractive map – see cable and landing point characteristics

Point to point Star Mesh Ring Buss Network topologies Which is used in your home? Between Internet WANs?

CEO VP Finance VP Marketing CIO Summary

Self-study questions Do cell phones use terrestrial or satellite connections? Which wireless technology is commonly used in homes? Can you think of a network that uses a one-many topology? Which topology does the Internet use? If you have a LAN at home, how many computers are connected to it? About how many computers are connected to our campus LAN? Do the computers on our campus LAN use wired or wireless technology? What is driving the rapid increase in mobile connectivity? What must happen to attain high growth rates? Internet video competes with cable TV. What do you think ISPs will do to meet that competition? What is the advertised speed of the connection between your home and the campus? How much do you pay per month? How does your connectivity speed and price compare to that in Hong Kong? What alternative do you have at your home? We mentioned two characteristics of a local area network as opposed to a wide area network. Do you recall what they were? What is the network topology of our campus LAN? Of the CALREN network?

Resources 1.Announcement that data outpaced voice traffic on the cellular network for the first time: The rapid growth of mobile data as opposed to mobile voice traffic: and Cisco wireless data projection for 2018: index-vni/white_paper_c html index-vni/white_paper_c html 4.Ericson mobility report: 5.Mobile Internet growth faster than fixed: mobile-internet-will-soon-overtake-fixed-internet/ mobile-internet-will-soon-overtake-fixed-internet/ 6.Connectivity infrastructure policy: 7.Erikson video on the mobile data/voice crossover: Data is 85% US mobile traffic and 39% of revenue: now-85-of-mobile-traffic-but-39-of-revenue-what-gives/ now-85-of-mobile-traffic-but-39-of-revenue-what-gives/ 9.Greg’s interactive global submarine cable map: 10.Telegeography interactive global submarine cable map: Google Fiber – may bring ISP competition to the US: