STM-ATM migration plan with bridge functions

The implementation of the asynchronous transfer mode (ATM) network, as one of the vehicles for B-ISDN services, has been the subject of many enthusiastic studies. ATM networks will gradually expand to meet society´s needs for B-ISDN. Since connections with existing STM networks will be required in this process of expansion, it is necessary to analyze bridge functions with them. It is also imperative that the main parts of services provided through existing STM networks such as plain old telephone services (POTS) and N-ISDN basic access services (2B+D) be efficiently integrated into an ATM network. The paper classifies and compares bridge functions with STM networks while clarifying an ATM network introduction scenario. The paper then studies the function that is considered to be most important, ATM cell assembly and disassembly (CLAD) for POTS and 2B+D service signals