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The planning and cost-modeling of large-scale computer Wide Area Networks (WANs) are important issues for carrier service providers, Internet Service Providers (ISP), and for large enterprises that use WANs. This paper develop several quantitative and business-oriented cost models that define the mathematical relationships needed to derive the cost estimate of a set of current WAN transmission technologies including: digital private lines, Frame Relay, ATM, ADSL, VSAT, and VPN. In addition, the research presents a cost-effective methodology for planning a large scales WAN. Based on the research methodology and cost models, a planning program for constructing a minimum-cost WAN design is developed and a case study is carried out for the design of a Kingdom-wide Saudi WAN.
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