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许多网络专家相信,他们面临的最大挑战是使数据网络加快速度、扩大范围、进而改善网络的应用性能。这种看法是非常有道理的,然而这仍有只见树木、不见森林之嫌。事实上,网络界正在发生根本性的变革,即从开始并行不悖的多种网络(即数据网络、电话网络和视像网络彼此独立、各司其责)过渡到统一网络。所谓统一网络,就是网络服务的一元化,由一个全数字化的网络设施来承担所有的通信服务,包括数据、声音和视像的通信。
Many network experts believe that the biggest challenge they face is to speed up and extend the data network to improve network application performance. This view is very reasonable, however, there are still trees and forests. In fact, the fundamental change is taking place in the cyberspace, that is, transitioning from a variety of networks (ie, data networks, telephony networks, and video networks that are independent of one another and their respective responsibilities) that start to go hand in hand to a unified network. The so-called unified network is the unification of network services. It consists of a fully digital network infrastructure to undertake all communication services, including data, voice and video communications.