Communication network has been expanded from small to large capacity, from analog to digital technology, from single service to diversified services.
通信网已实现由小容量向大容量、模拟技术数字技术、单一业务向多样化业务的跨越。
Communication network has been expanded from small to large capacity, from analog to digital technology, from single service to diversified services.
通信网已实现由小容量向大容量、模拟技术数字技术、单一业务向多样化业务的跨越。
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