宽带接入网的必要性随着通信和计算机技术的飞速发展,通信网络发生了巨大的变化。一方面由于交换机全面数字化,减少了网上的交换接点数:另一方面,长途网已基本实现传输和交换网数字化。现代通信正向宽带化、智能化、综合化和个人化方向发展。信 The necessity of broadband access network With the rapid development of communication and computer technology, the communication network has undergone tremendous changes. On the one hand, due to the full digitization of switches, the number of switching points on the network is reduced: on the other hand, long-distance networks have basically digitized transmission and switching networks. Modern communication is developing toward broadband, intelligence, integration and personalization. letter