KR940010618A - CO line interface circuit of key-phone - Google Patents

CO line interface circuit of key-phone Download PDF

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Publication number
KR940010618A
KR940010618A KR1019920020015A KR920020015A KR940010618A KR 940010618 A KR940010618 A KR 940010618A KR 1019920020015 A KR1019920020015 A KR 1019920020015A KR 920020015 A KR920020015 A KR 920020015A KR 940010618 A KR940010618 A KR 940010618A
Authority
KR
South Korea
Prior art keywords
signal
interface circuit
trunk line
loop control
unit
Prior art date
Application number
KR1019920020015A
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Korean (ko)
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KR950008108B1 (en
Inventor
김정길
Original Assignee
백중영
금성통신 주식회사
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Publication date
Application filed by 백중영, 금성통신 주식회사 filed Critical 백중영
Priority to KR1019920020015A priority Critical patent/KR950008108B1/en
Publication of KR940010618A publication Critical patent/KR940010618A/en
Application granted granted Critical
Publication of KR950008108B1 publication Critical patent/KR950008108B1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

본 발명은 키폰전화기의 국선 인터페이스 회로에 관한 것으로, 종래에는 이러한 인터페이스 회로에서 국선을 제어하는 중요 소자로 기계적 접점 전환의 릴레이를 다수 사용함에 따른 시스템과의 제어신호 처리에 오동작이 잦고 소음이 많아 이러한 회로의 동작적 신뢰성저하와 주변소음을 일으키게 되는 등의 불리한 문제점이 있었다.The present invention relates to a trunk line interface circuit of a key-phone telephone, and in the related art, there are many malfunctions and noises in the control signal processing with the system by using a plurality of relays of mechanical contact switching as an important element for controlling trunk lines in such an interface circuit. There are disadvantageous problems such as deterioration of operational reliability of the circuit and noise generation.

본 발명은 상기예의 불리한 문제점을 개선할 수 있도록 시스템의 국선단자에 연결되어 시스템으로 링 신호를 전달하는 광카플러부에 신호중계를 위한 입력제한부와, 브리지 정류부와 신호 트랜스 사이에서 이들 회로를 시스템 제어신호에 따라 전자식으로 연결제어하는 루프제어부 및, 신호트랜스와 병렬로 이어져서 신호의 전송중 DC전류를 적극 억제하는 전자쵸크부를 포함한 국선인터페이스 회로를 제공한다.The present invention provides an input limiting unit for signal relay to an optical coupler connected to the trunk line terminal of the system and transmitting a ring signal to the system so as to alleviate the disadvantages of the above-described systems, and between the bridge rectifier and the signal transformer system. Provided is a trunk line interface circuit including a loop control unit for connecting and controlling electronically in accordance with a control signal, and an electronic choke unit in parallel with the signal transformer to actively suppress DC current during signal transmission.

Description

키폰 전화기의 국선 인터페이스 회로CO line interface circuit of key-phone

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제2도는 본 발명의 국선 인터페이스 회로를 전체적으로 나타낸 실시예도,2 is an embodiment diagram showing the trunk line interface circuit of the present invention as a whole;

제3도는 제2도에서 루프 제어부의 실시예 회로도,3 is an exemplary circuit diagram of a loop controller in FIG.

제4도는 제2도에서 전자쵸크부의 실시예 회로도.4 is an exemplary circuit diagram of an electronic choke unit in FIG.

Claims (3)

키폰전화기의 국선인터페이스 회로에 있어서, 국선단자(PT, R1) 사이에 연결되어 링 신호가 일정전압 이상에서만 광카플러부(OPT)로 신호를 전달하는 입력제한부(3)와. 시스템의 루프제어신호에 의해 브리지 정류부(BD)의 출력과 신호트랜스(Tr)의 1차폭 입력을 전자식으로 연결제어하는 루프제어부(1) 및, 이 루프제어부(1)가 구동될때 신호트랜스(Tr)의 1차측 입력과 병렬로 연결되어 루프제어부(1)가 구동될때 신호전송에 필요한 최소한의 전류외의 DC전류를 제한하는 전자쵸크부(2)를 구비하는 것을 특징으로 하는 키폰전화기의 국선 인터페이스회로.In the trunk line interface circuit of a key-phone telephone, an input limiting section (3) connected between the trunk line terminals (PT, R1) to transfer a signal to the optocoupler unit (OPT) only when the ring signal is above a certain voltage. The loop control unit 1 for electronically connecting and controlling the output of the bridge rectifying unit BD and the primary width input of the signal transformer Tr by the loop control signal of the system, and the signal transformer Tr when the loop control unit 1 is driven. Trunk line interface circuit of a key-phone telephone, comprising: an electronic choke unit 2 connected in parallel with the primary input of the terminal to limit the DC current other than the minimum current required for signal transmission when the loop control unit 1 is driven; . 제1항에 있어서, 상기 루프제어부(1)는 시스템의 루프제어신호(LS)로 제어되는 광카플러부(OPT2)와, 이 광카플러부(OPT2)의 수광소자측과 연결되어 브리지정류부(BD)와 신호트랜스(Tr)를 상호 연결제어하는 트랜지스터(Q1)회로로 구성된 것을 특징으로 하는 키폰전화기의 국선 인터페이스 회로.The bridge rectifying unit (BD) according to claim 1, wherein the loop control unit (1) is connected to an optical coupler (OPT2) controlled by a loop control signal (LS) of the system, and is connected to a light receiving element side of the optical coupler (OPT2). And a transistor (Q1) circuit for interconnecting and controlling the signal transformer (Tr). 제1항에 있어서, 상기 전자쵸코부(2)는 신호트랜스(Tr)의 1차측과 병렬로 연설된 저항(R7, R8, R9, Rl0) 및 트랜지스터(Q2, Q3) 회로를 구비하는 것을 특징으로 하는 키폰전화기의 국선 인티페이스 회로.2. The electronic chocolate unit (2) according to claim 1, characterized in that the electronic chocolate section (2) includes resistors (R7, R8, R9, R10) and transistors (Q2, Q3) in parallel with the primary side of the signal transformer (Tr). The trunk line interface circuit of a key-phone telephone. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019920020015A 1992-10-29 1992-10-29 The interface circuits of a keyphone system KR950008108B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019920020015A KR950008108B1 (en) 1992-10-29 1992-10-29 The interface circuits of a keyphone system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019920020015A KR950008108B1 (en) 1992-10-29 1992-10-29 The interface circuits of a keyphone system

Publications (2)

Publication Number Publication Date
KR940010618A true KR940010618A (en) 1994-05-26
KR950008108B1 KR950008108B1 (en) 1995-07-25

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Application Number Title Priority Date Filing Date
KR1019920020015A KR950008108B1 (en) 1992-10-29 1992-10-29 The interface circuits of a keyphone system

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