The implementation and performance evaluation of the fault-tolerance for an ISDN PABX

ISDN 사설교환기의 결함내성 구현 및 성능평가

In this paper we wanted to implement a reliable ISDN PABX that could maintain the user's voice and data communication services, even when there might be an unexpected system error. In order to implement the fault-tolerance we made this ISDN PABX composed of an active and a standby side by duplicating the main control parts. Whenever a critical error occurs in the active side, it makes side exchange so that the standby side as anew active side continues to proceed the currently active voice or data services. Finally, through the performance evaluation we proved that user's voice or data communication can be serviced without any sense in spite of an system error.