KR890004320B1 - Interface circuit in exchange - Google Patents

Abstract

The circuit includes an unit (4) for transmitting a pulse signal generated by a dial pulse generator according to the phone number through local lines (P1, P2), an interval controller (5) for controlling intervals between phone numbers according to the MUTE signal, an unit (6) for transmitting DTNF signal of tone network terminal (TN) through the local lines after cutting the calling signal of the local lines and for mutual vocal signal transmission between the local lines and the vocal network terminals (VN1, VN2), and a switching unit (7) for switching the vocal signal path between the vocal network terminals (VN2, VN2) and the unit (6) according to the communication control signals.

Description

Switching interface circuit for CO line subscriber connection

The accompanying drawings is a circuit diagram of the exchange interface for the subscriber line connection of the present invention.

* Explanation of symbols for main parts of the drawings

1: call signal detection unit 2: interface circuit

3: Dial pulse generator 4: Dial pulse signal output part

5: interval control unit 6: DTMF signal transmission and voice communication unit

7: call path control

: 펄스신호

: 휴지신호P ₁ , P ₂ : CO line

: Pulse signal

: Pause signal

TN: Tone network terminal VN ₁ , VN ₂ : Voice network terminal

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a switching interface circuit for trunk line subscriber connection, which makes a call and calls between a general telephone and an extension telephone connected to an exchange such as an external telephone station through a trunk line, particularly in a trunk line switch having a small number of subscribers. The present invention relates to a switching interface circuit for trunk line subscriber connection which selectively outputs DTMF signals and pulse signals to trunk lines according to DTMF type exchangers and pulse type exchangers connected thereto.

In the conventional simple switchboards, when a subscriber of an extension telephone talks to a regular telephone, the telephone extension of the telephone which wants to talk by first calling the operator of the exchange regardless of whether the extension telephone is a DTMF telephone, a pulse telephone, a static telephone or a magnetic telephone, etc. The subscriber's telephone number was spoken, and the operator dialed the telephone number, connected, and then talked to the subscriber of the extension telephone. Therefore, it was troublesome for the subscriber and operator using the DTMF or pulsed telephone as an extension telephone. Its use was uncomfortable.

In view of the above-mentioned deficiency, the present invention connects an incoming call from an external general telephone connected through an external exchange of a CO line to an extension telephone after the operator answers directly, and the subscriber of the extension telephone directly connects to the external telephone. The telephone number can be dialed and mutually communicated, and the telephone number dialed according to the DTMF type exchange system and the pulse type exchange system connected to the trunk line is selectively output as DTMF signal and pulse signal. The explanation is as follows.

를 발생함과 아울러 휴지신호

를 출력하는 다이얼펄스 제너레이타(3)와, 상기 펄스신호

에 따라 국선(P₁, P₂)으로 다이얼링한 전화번호의 펄스신호를 출력하는 다이오드(D₅, D₆), 인버터(I₂), 릴레이이(RY) 및 릴레이 스위치(RYS₁, RYS₂)로된 다이얼링 펄스신호 출력부(4)와, 상기 휴지신호

에 따라 다이얼링한 각 전화번호의 펄스신호의 사이에 일정휴지 시간을 갖게하는 다이오드(D_ω-D₁₁), 인버터(I₃) 및 트랜지스터(TR₁)로된 간격 제어부(5)와, 국선(P₁, P₂)의 호출신호는 차단하고 톤네트워크 단자(TN)로 출력되는 다이얼링한 전화번호의 DTMF신호가 국선(P₁, P₂)으로 출력되게 함과 아울러 국선(P₁, P₂)으로 출력되게 함과 아울러 국선(P₁, P₂) 및 음성 네트워크단자(VN₁, VN₂)의 음성신호가 상호 전송되게 하는 콘덴서(C₂) 저항(R₉), 정전압 다이오드(ZD₁,ZD₂), 다이오드(D₁₂, D₁₃) 및 트랜스(T)로된 DTMF신호전송 및 음성 통화부(6)와, 상기 인터페이스회로(2)의 통화제어신호에 따라 상기 DTMF신호 전송 및 음성통화부(6)와 음성 네트워크단자(VN₁, VN₂)의 음성신호 통화로를 단속시키는 저항(R₁₀-R₁₇) 및 트랜지스터(TR₂-TR₆)로된 통화로 단속부(7)로 구성하였다.The accompanying drawings are exchange interface circuits for the trunk line subscriber connection of the present invention, as shown therein, resistors R ₁ -R ₈ and diodes D for detecting a call signal input through trunk lines P ₁ and P ₂ . _1- D ₄ ), the operational amplifiers OP ₁ , OP ₂ , the call signal detector 1 comprising the capacitor C ₁ and the inverter I ₁ , and the output signal of the call signal detector 1. An interface circuit for outputting a call control signal to the output terminal PA according to the output signal of the central processing unit and outputting a telephone number signal dialed by the subscriber of the extension telephone to the output terminals PC _{1 to} PC ₄ . 2) and a pulse signal according to the telephone number signal outputted from the interface circuit 2.

In addition to generating a pause signal

A dial pulse generator (3) for outputting the pulse signal;

Diodes (D ₅ , D ₆ ), inverters (I ₂ ), relays (RY) and relay switches (RYS ₁ , RYS ₂ ) that output pulse signals of telephone numbers dialed to trunk lines (P ₁ , P ₂ ) according to Dialed pulse signal output section 4 and the pause signal

The interval controller 5 comprising a diode D _ω -D ₁₁ , an inverter I ₃ , and a transistor TR ₁ , which give a constant pause time between pulse signals of each telephone number dialed according to the present invention; P _1, P ₂₎ paging signal is blocked and that the DTMF signals from the telephone number dialing output to the tone network terminal (TN) to be outputted to the trunk line (P _1, P ₂₎ as well as CO of (P _1, P ₂ Resistor (C ₂ ) resistor (R ₉ ) and constant voltage diode (ZD ₁ ), which allow the audio signal of trunk lines (P ₁ , P ₂ ) and voice network terminals (VN ₁ , VN ₂ ) to be mutually transmitted. , ZD ₂ ), DTMF signal transmission and voice communication unit 6 composed of diodes D ₁₂ , D ₁₃ and transformer T, and the DTMF signal transmission and voice according to the call control signal of the interface circuit 2. in a call to the unit 6 and the voice network terminal resistors (R ₁₀ -R ₁₇₎ and a transistor (TR ₂ -TR ₆₎ for interrupting a signal to voice calls (VN _1, VN ₂₎ call It was composed of sokbu 7.

로 출력되게 하고 릴레이 스위치(RYS₁, RYS₂)는 그의 릴레이(RY)가 구동될 경우에 가동단자가 일측고정단자(a₁, a₂)에 접속되고 구동되지 않을 경우에 타측 고정단자(b₁, b₂)에 접속되며, 도면의 설명중 미설명 부호 +VCC 및 -VCC는 전원단자이다.In the above, the central processing unit has a built-in program for notifying whether the switch connected to the trunk line (P ₁ , P ₂ ) is a DTMF type switch or a pulse type switch, and according to the program, the telephone number dialed by the subscriber of the extension telephone is dialed. The DTMF signal is output through the terminal TN, or the dial pulse generator 3 outputs a pulse signal through the interface circuit 2.

The relay switch (RYS ₁ , RYS ₂ ) is connected to one fixed terminal (a ₁ , a ₂ ) when the relay (RY) is driven and the other fixed terminal (b) when it is not driven. ₁ , b ₂ ), and the unexplained symbols + VCC and -VCC in the description of the drawings are power terminals.

When the call signal is input to the trunk lines (P ₁ , P ₂ ), the operation of the present invention configured as described above is divided into a case of a DTMF type exchange, a case of a pulse type exchange, and a case of mutual communication.

1. When a call signal is input to the trunk line (P ₁ , P ₂ ).

The subscriber of the general telephone dials the telephone number of the simple intercom, and when the call signal is input from the external exchange through the trunk line (P ₁ , P ₂ ), the input call signal is input through the relay switch (RYS ₁ , RYS ₂ ). Since the operational amplifier OP ₁ of the call signal detection unit 1 is input to the inverting and non-inverting input terminals (-) (+), the operational amplifier OP ₁ outputs a pulse signal, and the output of the output pulse signal is low. During the potential period, that is, the negative potential period, the capacitor C ₁ is charged and discharged through the resistor R ₇ during the positive potential period and applied to the inverting input terminal (−) of the operational amplifier OP ₂ .

Here, the capacitor in the case, setting the value of the capacitor (C ₁₎ capacitors and hold the discharge cycle than the charge period of the (C ₁₎ and a resistor (R _ω), the call signal trunk lines (P _1, P ₂₎ to be entered ( C ₁ ) is continuously charged with a low potential, and the low potential is inverted and amplified to high potential through the operational amplifier OP ₂ , and is inverted to a low potential through the inverter I ₁ to input the input terminal PB of the interface circuit 2. After the call is sent to the central processing unit, the central processing unit determines that a call signal is input from the outside and informs the operator of the call, and the operator calls the subscriber of the desired extension telephone (VN ₁ , VN ₂ ). To make a signal call.

At this time, the call signal input through the trunk line (P ₁ , P ₂ ) is also input to the DTMF signal transmission and voice call unit 6, the call signal is a high pass of the capacitor (C ₂ ) and the resistor (R ₉ ) It is blocked by the filter and cannot pass through the DTMF signal transmission and voice call unit 6.

2. In case of DTMF exchange If the exchange connected to the trunk line (P ₁ , P ₂ ) is a DTMF exchange, the DTMF exchange is stored in the program of the central processing unit in advance.

When the subscriber of the extension telephone is connected to the general subscriber via the trunk line (P ₁ , P ₂ ), the extension telephone is connected to the voice network terminal (VN ₁ , VN ₂ ) and then dials the telephone number of the general subscriber. The DTMF signal of the dialed telephone number is input to the tone network terminal (TN), applied to the secondary coil (T ₂₁ ) of the transformer (T), guided to the primary coil (T ₁ ), and then the capacitor (C ₂ ) and the relay. The switch () RYS ₁ , RYS ₂ ) is output to the trunk lines (P ₁ , P4 ₂ ) and transmitted to an external DTMF exchange connected to the trunk lines (P ₁ , P ₂ ), and the DTMF exchange exchanges the transmitted DTMF signal. As a result, the general subscriber is called to communicate with the subscriber.

At this time, the method of allowing the extension subscriber's phone to be connected to the voice network terminals VN ₁ and VN ₂ is connected when dialing a specific number of the extension phone as in the conventional method.

3. In the case of a pulse exchanger, if the exchanger connected to the trunk line (P ₁ , P ₂ ) is a pulse exchanger, the program indicating the pulse exchanger is stored in the program of the central processing unit in advance like the DTMF exchanger.

를 출력하고, 출력한 펄스신호

는 인버터(I₂)를 통해 반전된후 릴레이(RY)에 인가되어 릴레이(RY)가 구동 및 구동 정지를 반복하게 되므로 릴레이 스위치(RYS₁, RYS₂)의 가동단자가 펄스신호

의 수에 해당되는 만큼 일측 고정단자(a₁, a₂) 및 타측 고정단자(b₁, b₂)에 반복 절환되면서 국선(P₁, P₂)으로 펄스신호를 출력하게 된다.When the subscriber of the extension telephone calls the general subscriber via the trunk line (P ₁ , P ₂ ), if the extension telephone is connected to the voice network terminal (VN ₁ , VN ₂ ), and then dials the telephone number of the subscriber, According to the output signal of the central processing unit, the interface circuit 2 outputs the telephone number signal dialed to the output terminals PC _{1 to} PC ₄ and is input to the dial pulse generator 3, so that the dial pulse generator 3 ) Is the pulse signal of the number corresponding to the dialed telephone number.

Output pulse signal

Since the inverter is inverted through the inverter I ₂ and applied to the relay RY, the relay RY is repeatedly driven and stopped. Therefore, the movable terminals of the relay switches RYS ₁ and RYS ₂ are pulse signals.

The pulse signal is output to the trunk lines P ₁ and P ₂ while repeatedly switching to one fixed terminal (a ₁ , a ₂ ) and the other fixed terminal (b ₁ , b ₂ ).

의 출력이 완료되면 다이얼 펄스 제너레이타(3)는 일정시간 동안 저전위의 휴지신호

를 출력하고, 출력한 휴지신호

는 인버터(I₃)를 통해 고전위로 반전된후 트랜지스터(TR₁)에 인가되어 그가 온되므로 국선(P₁, P₂)이 릴레이 스위치(RYS₁, RYS₂)으로 아무런 신호도 출력되지 않도록 하게 되고, 일정시간이 경과되면, 다시 다이얼링한 전화번호의 수의 펄스신호

를 출력하는 것을 반복하게 되며 이와같이 국선(P₁, P₂)으로 출력되는 펄스신호

는 외부의 펄스식 교환기로 전송되고, 펄스식 교환기는 그 전송된 펄스신호

에 따라 일반 가입자를 호출하여 내선 가입자와 상호 통화하게 한다.Pulse signal of one phone number dialed in this state

When the output is completed, the dial pulse generator (3) stops at a low potential for a predetermined time.

Outputs a pause signal

Is inverted to high potential through the inverter I ₃ and applied to the transistor TR ₁ so that it is on so that the trunk lines P ₁ and P ₂ do not output any signal to the relay switches RYS ₁ and RYS ₂ . When a certain time elapses, the pulse signal of the number of the dialed telephone number is again.

Repeatedly outputs the pulse signal output to the trunk lines (P ₁ , P ₂ )

Is transmitted to an external pulse exchange, and the pulse exchange exchanges the transmitted pulse signal.

Accordingly, the general subscriber is called to make a mutual call with the extension subscriber.

4. In case of mutual communication, that is, in case of not making a telephone call, the interface circuit 2 outputs the high potential to the output terminal PA under the control of the central processing unit, and the transistor TR ₄ is turned on by the high potential. Therefore, the transistors TR ₂ , TR ₃ , TR ₅ , and TR ₆ are all turned off.

Therefore, since one terminal of the secondary coils T ₂₁ and T ₂₂ of the transformer T cannot be grounded, current flow of the voice network terminals VN ₁ and VN ₂ is blocked, and telephone calls are blocked.

In this state, when the telephone call condition is completed and the interface circuit 2 outputs the low-potential call control signal to the output terminal PA under the control of the central processing unit, the transistor TR ₄ is turned off, so the power supply terminal is turned off. A power supply of (+ VCC) is applied to the bases of the transistors TR ₅ and TR ₆ through the resistor R ₁₂ and then turned on, and the base of the transistors TR ₂ and TR ₃ through the resistor R ₁₃ again. Is applied to the transistor TR ₂ and TR ₃ to operate in the saturation region and the transistors TR ₅ and TR ₆ to operate in the active region.

Accordingly, since one side terminal of the secondary coils T ₂₁ and T ₂₂ of the transformer T ₁ is grounded through the resistors R ₁₄ and R ₁₅ and the transistors TR ₂ and TR ₃ , the voice network terminals VN ₁ and VN are provided. ₂ ) current through the diodes (D ₁₂ , D ₁₃ ), the secondary coils (T ₂₁ , T ₂₂ ) of the transformer (T), resistors (R ₁₂ , R ₁₅ ) and transistors (TR ₂ , TR ₃ ) to ground The voice signals of the subscribers of the extension telephones connected through the voice network circuits of the voice network terminals V ₁ and V ₂ are guided to the primary coil T ₁ of the transformer T and flow the condenser C ₂ and the relay switch RYS _1. , RYS ₂₎ a trunk line (P _1, P ₂₎ to be output, CO (P _1, and the general telephone subscriber speech signal the relay switch (RYS _1, RYS ₂₎ connected to the P _2), a capacitor (C ₂ through ) Is applied to the primary coil (T ₁ ) of the transformer (T) through a high-pass filter of resistance (R ₉ ) and guided to the secondary coils (T ₂₁ , T ₂₂ ), and then the voice network terminals (V ₁ , V _2). ) The extension of regular telephone subscribers and between subscribers are able to make a phone call.

As described in detail above, the present invention allows the subscriber of the extension telephone to directly call the subscriber of the general telephone and make a call, as well as the external exchange to which the general telephone is connected, regardless of whether it is a DTMF exchanger and a pulse type interrogator. Eliminates the hassle of subscribers and has a convenient effect.

Claims (1)

A call signal detection unit 1 for detecting a call signal input through trunk lines P ₁ and P ₂ , and an output signal of the call signal detection unit 1 to a central processing unit, and according to the output signal of the central processing unit An interface circuit (2) for outputting a call control signal and a telephone number signal dialed by an extension subscriber, and a dial pulse generator (3) for outputting a pulse signal (PUL) and a pause signal (MUTE) in accordance with the telephone number signal; And a dialing pulse signal output unit 4 for outputting a pulse signal of the telephone number dialed to the trunk line P ₁ , P ₂ according to the pulse signal PUL, and each telephone dialed according to the pause signal MUTE. The interval control unit 5 which has a constant pause time between the numbers and the call signal of the trunk lines P ₁ and P ₂ are blocked, and the dialed DTMF signal of the tone network terminal TN is connected to the trunk lines P ₁ and ₂ . CO line (P ₁ , P ₂ ) and voice network DTMF signal transmission and voice call unit 6 for transmitting voice signals of terminals VN ₁ and VN ₂ to each other, DTMF signal and voice call unit 6 and voice network terminal VN ₁ in accordance with the call control signal. And VN ₂ ) a communication interface regulating unit (7) configured to intercept a voice signal communication path between the trunk lines and subscribers.

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