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Understanding Local Access Networks and Their Role in Telecommunications

This section introduces concentrators and multiplexers, essential devices for interconnecting local access networks (LACNs) with existing wide area networks (WANs). A LACN goes beyond a traditional LAN by linking end-user nodes like PCs and workstations to each other and to the WAN. Addressing critical needs in end-user computing, the design of a cost-effective internetwork is discussed, highlighting capacity constraints and major cost components such as acquisition and installation costs of concentrators and bandwidth links. Example scenarios illustrate practical applications of these concepts.

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Understanding Local Access Networks and Their Role in Telecommunications

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Presentation Transcript

  1. Introduction to Telecommunication Systems(Continued) Telecommunication Devices Concentrators

  2. Local Access Network • Concentrators/multiplexers can interconnect local access networks and an existing WAN • Local Access Network (LACN) • A LACN is more than a LAN A regional network that connects end-user nodes (e.g., PC, Workstation, LAN) among themselves, and to an existing wide area network

  3. IntroductionCritical Needs in End-User Computing • Most end-users want access to Internet and/or communicate with one another. • An imperative need to support full connectivity among end-user nodes and an existing WAN.

  4. Ethernet Outgoing Traffic Mainframe (LAN) FDDI (LAN) Token ring Remote users IntroductionConnectivity Among End-user Nodes

  5. LACN LACN LACN LACN WAN LACN LACN LACN LACN LACN LACN Network DesignHow to support full connectivity? • Design the most economic internetwork between “end-user nodes” and an existing WAN

  6. A direct connection to a WAN backbone node Connection via concentrators LACN LACN LACN LACN LACN LACN LACN LACN LACN LACN LACN LACN Network DesignFind an economic internetworking solution

  7. Capacity Constraints • Port Capacity Constraint • Processing Capacity Constraint

  8. Network Design ManagementHow to design a feasible and economical internetwork? • Find an optimal number of concentrators to interconnect all given LACN nodes to some backbone nodes on an existing WAN such that ... • All LACN nodes are connected • LACN communication requirements are satisfied • Capacity constraints on each concentrator is not violated • Total internetworking costs are minimized

  9. Major Cost Components • Acquisition and installation costs of a concentrator • Cost of high bandwidth link between concentrator and backbone node • Cost of low bandwidth link between end-user node and concentrator

  10. Example 1

  11. Example 2

  12. Example 3

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