A市宽带城域网可支持高速的数据接入，直接向大楼、商业用户和住宅用户群提供各种宽带业务，支持诸如高速Internet、VPLS（LAN互连）、交互视频、远程医疗/教育等交互式业务。由于AADSL宽带用户发展迅速，随着设备容量的不断增加以及其他条件的限制，组网形式日趋复杂，设备的运行情况也各不相同，再加上各种机型之间配合上的问题，使维护中出现的问题越来越复杂和隐蔽。下面就实际维护中所遇到的三例故障，浅析宽带城域网的维护。-A municipal broadband metropolitan area network can support high-speed data access, directly to the building, business users and residential users to provide various broadband services and support, such as high-speed Internet, VPLS (LAN interconnection), interactive video, remote health care/education, etc. interactive services. AADSL as a result of the rapid development of broadband users, with increasing equipment capacity, as well as other restrictions, the network form of the growing complexity of the operation of equipment varies, together with the co-ordination between the various models of the problem, so problems in the maintenance of increasingly complex and subtle. The actual maintenance of the following that were encountered in three cases of failure, Analysis of Broadband MAN maintenance.