Today, network operators continue to seek convergence of their networks to reduce operational expenses and eliminate unnecessary additional capital expenditures on multiple parallel networks. Driven by the need for rapid returns on investments (ROIs), telecom carriers are integrating a variety of services including residential broadband, advanced enterprise data connectivity, and video into existing voice networks while cable operators are adding voice over IP (VoIP) and advanced enterprise data services to the existing video and residential broadband infrastructure. At the same time, there is a massive migration from traditional SONET/ SDH-based TDM services to IP/Ethernet-based services, including voice, video, Internet access, and Layer 2 business services.
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