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OSI Layer 1

OSI Layer 1. Topology. Topologies. Basic physical topologies: Bus Mesh Star Ring Hybrid. Topologies. Bus Topology (Co-axial ). Physical Bus Topology. Traditionally Thinnet or Thicknet coaxial cable Signal propagates in both directions from the point of origin

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OSI Layer 1

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  1. OSI Layer 1 Topology

  2. Topologies • Basic physical topologies: • Bus • Mesh • Star • Ring • Hybrid

  3. Topologies Tamara Dean: Network+ Guide to Networks

  4. Bus Topology (Co-axial)

  5. Physical Bus Topology • Traditionally Thinnet or Thicknet coaxial cable • Signal propagates in both directions from the point of origin • Requires 50-ohm termination transistors to prevent signal bounce • Good • Least amount of cabling - inexpensive to set up • Bad • Only one communication channel, thus every node shares the bus's total capacity - network performance degrades as nodes are added • Rarely practical for networks with more than a dozen nodes • Highly susceptible to single element failure http://www.houseofhum.com/stephen/library/network_primer/toc.html

  6. BNC Connector - Thinnet RG-58A/U http://www.the-idle-monk.co.uk/hoard/ethernet/physical.html

  7. Mesh Topology

  8. Redundant Switches

  9. Star Topology

  10. Netgear EN104TP 4-Port 10 Mbps Ethernet Hub RJ-45 with Uplink Button http://www.amazon.com/Netgear-EN104TP-4-Port-Ethernet-Uplink/dp/B00000J4M9/ref=sr_1_4?s=electronics&ie=UTF8&qid=1359424021&sr=1-4&keywords=ethernet+hub

  11. Stackable Hubs

  12. WiFi

  13. Hub vs. Switch • Hub • Only one transmission at a time • Single collision domain • Packet is sent to all ports • Switch • Simultaneous transmissions without collisions • Creates multiple collision domains • Packet is sent to a single port http://cc.concord.edu/Networking/networking.htm

  14. Hybrid Bus-Star Topology

  15. Distributed Backbone Topology Co-ax bus with TP star branches Jean Andrews: A+ Guide To Managing and Maintaining Your PC

  16. Ring Topology

  17. Ring Topology http://www.datacottage.com/nch/troperation.htm#.Uk9iTYasi-0

  18. Physical Topology ≡ Logical Topology ? • Physical Topology • Physical pattern formed by physical layout of media and connectivity devices • Logical Topology • Pattern formed by the flow of data packets, how data flows from device to device • Consider a physical star / logical ring configuration

  19. Connectivity Devices

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