SONET rings remain the dominant optical transport architecture in the metropolitan area. To support traffic growth on these rings, WDM technology is used to provide multiple SONET rings on the same fiber, each SONET ring running on a separate wavelength. Traffic grooming refers to intelligently arranging low speed traffic streams onto different SONET rings and selecting the proper line speed for each wavelength so as to minimize certain cost objective, such as the total cost of electronic Add-Drop Multiplexer (ADM) equipments used.
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