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Legacy optical transport networks have been designed to provide Time-Division Multiplexing (TDM) services such as voice traffic with high performance and low latency. However, the world of telecommunications is changing due to the accelerating demand for Ethernet services. Ethernet has been gaining greater interest from both data service providers and telecommunications service providers because of its low cost, flexibility, and bandwidth scalability. Moreover, optical transport networks are changing their properties to include burstiness and finer granularity. These changes are driving a move from circuit-based optical transport networks to packet-based optical transport networks in metro and core regions.
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