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OSI Layer 1 Topology.

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Presentation on theme: "OSI Layer 1 Topology."— Presentation transcript:

1 OSI Layer 1 Topology

2 Transmission Media Tamara Dean: Network+ Guide to Networks

3 BNC Connector - Thinnet RG-58A/U

4 DB-9 Connector / Vampire Tap - Thicknet RG-8

5 RJ-45 and RJ-11 Connectors RJ = "Registered Jack" RJ-45: 8 pins CAT
Tamara Dean: Network+ Guide to Networks RJ = "Registered Jack" RJ-45: 8 pins CAT RJ-11: pins telephone Tamara Dean: Network+ Guide to Networks

6 PCI NIC

7 NIC Jean Andrews: A+ Guide To Managing and Maintaining Your PC

8 Netgear EN104TP 4-Port 10 Mbps Ethernet Hub RJ-45 with Uplink Button

9 Attenuation and Noise Jean Andrews: A+ Guide to Managing and Maintaining Your PC Jean Andrews: A+ Guide to Managing and Maintaining Your PC

10 Cable Management Patch Panel Punch-down Block
Tamara Dean: Network+ Guide to Networks Punch-down Block Tamara Dean: Network+ Guide to Networks

11 Cable Management Careful attention to the cable plant gives fewer physical layer network problems. Pay careful attention to cable fabrication and cable installation techniques. A cable which is working fine at 10 Mbps may not work well at 100 Mbps. Use patch panels and punch down blocks to break up and organize cable runs. TIA/EIA 568 Commercial Building Wiring Standard.

12 Fiber Optic Cable Structure
Tamara Dean: Network+ Guide to Networks Glass Core Glass Cladding Plastic Casing Kevlar Plastic Sheath fibers / cable (see pg 124 in Roberts text) Tamara Dean: Network+ Guide to Networks

13 Fiber Connector Types (SM & MM)
SC - Subscriber/Standard Connector ST - Straight Tip Tamara Dean: Network+ Guide to Networks MT-RJ - Mechanical Transfer Registered Jack LC - Local Connector SC, ST - Existing fiber networks LC, MT-RJ - Newer fiber networks - Smaller size allows higher density of connections at termination point FC - see pg 135 in Roberts text Tamara Dean: Network+ Guide to Networks

14 Fiber Optic Connectors

15 TOSLink Optical Digital Audio Cable

16 Duplex Fiber

17 Topologies Basic physical topologies: Bus Mesh Star Ring Hybrid

18 Topologies Tamara Dean: Network+ Guide to Networks

19 Bus Topology (Co-axial)

20 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

21 Mesh Topology

22 Redundant Switches

23 Ring Topology

24 Ring Topology

25 Star Topology

26 Physical Topology ≡ Logical 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

27 Hybrid Bus-Star Topology

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

29 Bus-Star Topology with Switches

30 WiFi

31

32 Hub vs. Switch Hub Switch 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

33 Stackable Hubs


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