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The next generation network (NGN) may be regarded as a fresh broadband architecture that best utilizes and combines the major advances in optical, wireless, and computer communication networking of the past decade. Attractive business opportunities will be opened by the NGN, but cost-effectiveness in building and operating it remains a crucial challenge that can differentiate a profitable implementation strategy from one that is merely "hype". This paper proposes a promising PON+WiMax architecture for optical-wireless-integration (OWI) and a cost model for this architecture that considers the related optimization issues. Results from initial use of this cost model compare OWI with other existing solutions for broadband access, showing superior cost-effectiveness for the OWI solution as well as the potential for further reducing capital and operating expenses.