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Chabot College

Chabot College. ELEC 99.05 Network Topologies & Connections. Toplogies and Connections. Differing physical topologies yield equivalent ethernet traffic at the workstation. For UTP connections, cable type depends on the types of devices connected. Bus Topology. Extended Star Topology.

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Chabot College

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  1. Chabot College ELEC 99.05 Network Topologies & Connections

  2. Toplogies and Connections • Differing physical topologies yield equivalent ethernet traffic at the workstation. • For UTP connections, cable type depends on the types of devices connected.

  3. Bus Topology

  4. Extended Star Topology

  5. Equivalent Ethernets

  6. Crossover Cable • Transmit pair “crosses over” to Receive pair.

  7. Crossover Cable • Connects NIC to NIC. • Connects hub to hub.

  8. Straight-Through Cable • Connects NIC to hub.

  9. Straight-Through Cable • When connecting two PCs via a hub, straight-through cables are used. Where does the crossover occur? • In the hub!

  10. Cabling Example

  11. Hub Feature • Most hubs have a special “uplink port” that can be switched from crossover to straight-through function. • Usually, the uplink is port 1. • The uplink allows use of straight-through cables throughout all connections.

  12. Hubs with Uplink

  13. Quiz • NIC to NIC - what type cable? • Crossover • NIC to hub - what type cable? • Straight-through

  14. Quiz • Hub to hub - what type cable?? • Crossover • Hub uplink port to hub - what type cable? • Straight-through

  15. Quiz • On most hubs, which port is the hub uplink on? • Port 1 • Could I attach a workstation NIC to the uplink port? • Sure - just use a regular straight-through cable. If necessary, change the setting on the uplink port switch!

  16. Quiz • How can I tell if the hub’s uplink port switch is set correctly for the type of cable & device attached? • Look for link light!

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