StructuredBackboneDesignofComputerNetworks.pptVIP

* * * * * * * * * * * * * * * * * * * * * * * Atef J. Al-Najjar Structured Backbone (Contd.) The Wide Area Network link Horizontal access Backbone WAN Interface Atef J. Al-Najjar When are Backbones needed? Companies utilizing Backbone technology have typically one or more of the following communication needs: Multiple data protocols and signals. Heavy network traffic to be supported simultaneously. Multiple work-groups, networks, and facilities that need to be internetworked. Mission critical applications where high reliability and security are mandatory. Atef J. Al-Najjar When are Backbones needed? (Contd.) Need to support varying media and device types. A high degree of upgrade-ability, so that existing equipment can be preserved and higher performance hardware and software solutions can be implemented seamlessly. A high degree of network moves, adds, and changes, requiring that the enterprise network be highly manageable. Atef J. Al-Najjar Types of (private) Backbones Three broad categories: (1) Multiplexers-based. (2) LAN Backbones. FDDI, Ethernet, Token Ring, etc (3) Collapsed Backbones. High-speed Router, Switches, ATM. Atef J. Al-Najjar Backbone Topologies Star Collapsed Backbone PBX system Switch-based networks Atef J. Al-Najjar Backbone Topologies (Contd.) Ring. Ex: FDDI. Atef J. Al-Najjar Backbone Topologies (Contd.) Hierarchical/Inverse Tree. Higher power at higher levels. Atef J. Al-Najjar Backbone Topologies (Contd.) Mesh. Multiple data paths between peer stations. Topology relies on the use of Routers. Atef J. Al-Najjar Backbone Benefits + Makes complex distributed computing environment easier to manage. + Allows Organizations to easily upgrade the system. + Creates an integrated communication path capable of accommodating the enterprise’s data transfer requirements safely and cost effectively. Atef J. Al-Najjar Fiber Optics Many of the Backbone advantages are enabled by the implementation of fiber. Advantages of fiber: + Ability to co