Functional considerations for development of SDH technology-based broadband digital cross-connect system

It is necessary to enhance the telecommunication environments to support high speed and flexible networking. To meet this purpose, the paper describes the functional considerations for the development of a digital cross-connect system, named the BDCS (broadband DCS), that is based on the SDH (synchronous digital hierarchy) technology. These are the switching functions, network survivability functions, sub-network management functions and the test access functions. In examining the switching functions for the cross-connection of the individual AU (administrative unit) and TU (tributary unit), the paper describes the switching steps and discusses the system capacity. The network survivability functions are described with reference to their importance in the public network. A method for the total network management function with sub-network management capabilities is suggested. The test access functions are described in view of its capacity and test methods.