The "Network Management Interface Controller of Switch" (NMICS) is the front-end processor of Network Traffic' Manager Operation System (NTMOS). It can be used to connect with four types of digital switching systems, such as S1240. GTD-5. 5ESS and TC5. Meanwhile, it can provide the connective condition of the switches to the users and gather or store the original network management data of any kind of the switches in every 5 minutes and 30 seconds. The controller uses standard PC as the basic Hardware, saving a lot of hardware cost, and Windows NT server as the basic platform and the Visual Basic professional version 5.0 for software development, providing a system administrator an easy-used operational environment. This article describes the subjects: System Structure System Requirement of Hardware and Software, and System Functions.