Networking Chapter 14

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Networking Chapter 14

  1. 1. Remote Connectivity Chapter 14
  2. 2. Objectives• Describe WAN telephony technologies, such as SONET, T1, and T3• Compare last-mile connections for connecting homes and businesses to the Internet• Discuss and implement various remote access connections
  3. 3. • Tier-1 ISP – Most long-distance connections that make up the Internet use the SONET signal type – Originally designed for heavy-duty circuits like T1 – Most of the high-speed Internet backbone uses old telephone technologies
  4. 4. • The Dawn of Long Distance – Telephone operator made physical link – Analog signals lost quality over distance – Analog required many wires
  5. 5. • Long distance a series of trunk lines – Operator had to connect each intersection – Circuit switching • a. Two phones physically on one circuit • b. Only option for analog long distance – From analog to digital • a. Analog adequate through 1930s to 1950s • b. New digital system needed for heavy load
  6. 6. • Types of wiring technologies – Cable • Cannot use your own equipment – Fiber • In big cities where metropolitan area networks of fiber have been installed • Fiber WAN connection easy to install • Faster than T1
  7. 7. • Types of wiring technologies – Satellite • Costly solution • Efficiency affected by weather – DSL • Only for Internet connections • Really a last mile issue
  8. 8. • Cable Modems – Added service from cable TV providers – Cable TV industry modified infrastructure – Cable modems now very common – Theoretical speed: 10 to 27 Mbps
  9. 9. • Satellite – 1. Only option for some remote locations – 2. One-way • Download from satellite • Upload using a PSN connection – 3. Two-way • Download and upload via satellite – 4. Slower than DSL or cable modem – 5. Faster than PSTN – 6. Requires satellite antenna – 7. Connects to a satellite modem – 8. Modem connects to PC NIC or network
  10. 10. • Wireless – Two types of service • Mobile data services (cellular network) – a. GSM – b. GRPS – c. EDGE – d. HSPDA • 802.11 – a. Wireless LAN standard – b. Not really a WAN solution
  11. 11. • Fiber – Telephone providers lost share to cable companies – Fiber-to-the-home/fiber-to-the-premises • Telco competition to cable • U.S. providers – AT&T (U-verse) – Verizon (FiOS) – Speeds will increase to over 100 Mbps

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