Preliminary design involves considering all the network requirements and constraints (including the budget), and determining viable alternative solutions. The network owner is then consulted, and together an optimal solution is chosen; this solution is later developed into the final design. Both the preliminary design and final design are done during the PDIOO Design phase.
Two models that can be used for network design are examined in the "Modular Network Design" section, later in this chapter. Whichever model is used, a top-down approach (rather than a bottom-up approach) is recommended.
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