随着下一代网络(NGN)技术的迅猛发展和电信市场需求的快速增长，我国即将进入NGN部署的关键时期。
With the rapid development of NGN technologies and telecom market, China will enter a critical stage of deployment for next generation network (NGN).
随着电信技术的进步，基于电路交换技术的PSTN正逐步向下一代网络（NGN）过渡。
With the progress of telecommunication technology, PSTN based on circuit switch technology is carrying out the transition to the Next Generation Network (NGN) increasingly.
伴随着对无源光网络带宽和可扩展性需求的不断增加，下一代无源光网络的研究和设计以提到议事日程上。
With continued demand for bandwidth and scalability in passive optical networks, there is a need to address the evolution of passive optical networks from the current generation to next.
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