KR870000812A - Busy Indicator on the Phone - Google Patents
Busy Indicator on the Phone Download PDFInfo
- Publication number
- KR870000812A KR870000812A KR1019850004366A KR850004366A KR870000812A KR 870000812 A KR870000812 A KR 870000812A KR 1019850004366 A KR1019850004366 A KR 1019850004366A KR 850004366 A KR850004366 A KR 850004366A KR 870000812 A KR870000812 A KR 870000812A
- Authority
- KR
- South Korea
- Prior art keywords
- busy indicator
- transistor
- led
- telephone
- resistor
- Prior art date
Links
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- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
- Interface Circuits In Exchanges (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
Abstract
내용 없음.No content.
Description
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.
제2도는 본 발명에 의한 전화기에 LED를 설치한 상태를 간략하게 예시한 도면.2 is a view briefly illustrating a state in which the LED is installed in the telephone according to the present invention.
제3도는 기존의 전화기에 본 발명의 실시예에 의한 별도의 전원을 사용할 때의 구체적인 비지 인디케이터의 회로도.3 is a circuit diagram of a specific busy indicator when using a separate power supply according to an embodiment of the present invention in an existing telephone.
제4도는 국선 1회선에 여러대의 전화기를 병렬로 연결하여 사용할 때 상술한 본 발명의 실시예에 의한 전체적인 실시상태도.Figure 4 is an overall embodiment according to the embodiment of the present invention described above when using a plurality of telephones connected in parallel to the trunk line.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
L1,L2: 선로 D1,D2,D3,D4: 다이오우드L 1 , L 2 : Track D 1 , D 2 , D 3 , D 4 : Diode
R1,R2,R3: 저항기 LED : 발광다이오우드R 1 , R 2 , R 3 : Resistor LED: Light Emitting Diode
TR1,TR2: 트랜지스터 S/W : 후크스위치(Hook Switch)TR 1 , TR 2 : Transistor S / W: Hook Switch
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019850004366A KR870000812A (en) | 1985-06-20 | 1985-06-20 | Busy Indicator on the Phone |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019850004366A KR870000812A (en) | 1985-06-20 | 1985-06-20 | Busy Indicator on the Phone |
Publications (1)
Publication Number | Publication Date |
---|---|
KR870000812A true KR870000812A (en) | 1987-02-20 |
Family
ID=69136741
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1019850004366A KR870000812A (en) | 1985-06-20 | 1985-06-20 | Busy Indicator on the Phone |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR870000812A (en) |
-
1985
- 1985-06-20 KR KR1019850004366A patent/KR870000812A/en not_active IP Right Cessation
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Legal Events
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SUBM | Submission of document of abandonment before or after decision of registration |