Abstract
Carriers have successfully deployed Legacy SONET Network Elements (NEs) in North America for the past 15 years. The market segmentation for these SONET Add/Drop Multiplexer (ADM) devices was fairly simple and easy to understand: devices were ADMs with the ability to drop a mix of legacy electrical and optical Time Division Multiplexing (TDM) circuits, mainly DSx and OC-n signals. The differentiation among the various platforms from an individual vendor was based on the OC-n rate of the high-speed interface. In other words, carriers were purchasing an OC-n Multiplexer with a set of drop interfaces.
© 2005 Optical Society of America
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