A subscriber Loop Interface for a PCM PBX System has been studied and implemented.
In the first part, the whole architecture of the PBX System has been explained.
In the second part, major components and circuits for the interface has been discussed.
For the battery feed and hybrid operation, a simple circuit of an isolation transformer and the active hybrid circuit has been designed.
In the third part, the scanners for the subscribers and trunks were implemented, and their performances were measured.
It is found that the printed circuit board for the interface functions perform satisfactorily in the PCM PBX System.
PCM PBX System의 Subscriber Loop Interface에 대하여 연구 실험하였다.
먼저 PCM PBX System의 구성개요가 설명되었으며, Subscriber Loop Interface의 중요부분과 보조장치들이 고찰되었다.
hybrid회로는 isolation transformer와 연산증폭기를 이용한 active hybrid로 구성하여 이들의 특성이 측정되었으며, 각 보조 장치들을 제작한 후 동작실험을 하였다.
위의 각 부분을 조합하였을 때 전체회로가 PCM PBX System에서 만족스럽게 동작하는 것이 확인되었다.
