대한전기학회:학술대회논문집 (Proceedings of the KIEE Conference)
- 대한전기학회 1988년도 전기.전자공학 학술대회 논문집
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- Pages.157-160
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- 1988
PSTN과 인터폰망사이의 자동접속장치의 개발에 관한 연구
A Study on the Development of the Interfacing Unit between PSTN and Interphone Network
- Yang, Woon-Geun (Incheon Univ.) ;
- Lee, Choong-Woong (Seoul National Univ.)
- 발행 : 1988.07.01
초록
This paper describes the development of the Interfacing unit between PSTN and interphone network. The designed and realised system detects the ring signal from PSTN and makes off-hook condition when it is detected. Then the caller can hear the response tone from the unit and the tones of the interphone network condition. The developed system receives the interphone number to which the caller wants to connect by MFC tones and drives Interphone switch matrix. Thus, a call is connected to the interphone user directly. The caller may press the interphone number up to 10 digits and the last two of which are recognized as valid ones. The caller must press the first digit within 20 seconds after system response.
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