一、用户接入网使用光纤的３种方法在近年通信建设的快速发展中,除了长途网、城市网等骨干网是主要改进的对象外,用户接入网也需要设法彻底地改进。这是因为通信用户使用的业务种类正在快速扩大,除了原有的电话机外,越来越多的用户加装个人计算机和视像设备,藉以实现数据通信和可视图像通信。相应地,对每一通信用户连至交换局的接入线,要求提供较大的传输带宽能力。诸如,用户使用 First, the user access network using optical fiber 3 methods In recent years the rapid development of communications construction, in addition to long-distance network, urban network backbone network is the main improvement of the object, the user access network also needs to find ways to thoroughly improve. This is because the types of services used by communication users are rapidly expanding. In addition to the existing telephone sets, more and more users install personal computers and video equipment to implement data communication and visual image communication. Correspondingly, it is required to provide greater transmission bandwidth capacity for each communication line connected to the exchange. Such as user use