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随着通信技术、计算机技术的发展，今后通信网将是全数字、全光纤的综合业务数字网（B－rD川，可以满足数据、图象及计算机通化的再种业务要求。目前，我国长途干线已全部建…七缆，省内二级干线、市话局间中继也基本建成光纤网。为满足广大用户对数字、图象、视频等多种媒体服
With the development of communication technology and computer technology, the future communication network will be an all-digital, all-fiber integrated service digital network (B-rdC), which can meet the requirements of re-establishing data, images and computerized services. At present, The main line has been built ... Seven cable, the province’s second-level trunk, the municipal branch of the trunk is also basically completed optical network.In order to meet the majority of users of digital, image, video and other media services