KR830001678B1 - A common telephone device - Google Patents

Abstract

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Description

A common telephone device

1 is a block diagram showing an overall view of a common telephone apparatus of the present invention.

FIG. 2 is a detailed circuit diagram of the connecting portion of the FIG. 1 functional block. FIG.

3 is a detailed circuit diagram of a display unit, an operation unit and a control unit in the FIG. 1 functional block.

4 is a detailed circuit diagram of a signal receiver, a signal controller, a caller, a main telephone and an extension telephone in the functional block of FIG.

According to the present invention, when the trunk line of 1 and the telephone line of 2 are used as a shared telephone or an extension telephone, each telephone and each telephone pushbutton of each telephone are operated at each telephone position, thereby making a call between each telephone, making a call connection, and making an outgoing call connection to a trunk line. The present invention relates to a common telephone apparatus for making an incoming call connection from a trunk line and making a divert call connection to a counterpart telephone side.

The common phone or Euljong extension phone is used by two telephones on one trunk line. The conventional common phone or Euljong extension phone is equipped with a switch at the location of the main phone. When it is exclusively connected to the telephone and needs to connect the CO line with the expansion converter, the buzzer or intercom is used to call the other party and operate the converter so that the CO line and the main switching period are opened. The extension telephone period is connected, and an operation for restoring the diverter to the correct position after the call has been commonly used.

The operation of such a switch is not possible to make a trunk line connection when there is no person in the main phone position, and a buzzer or an interphone must be installed separately from the telephone next to each telephone for signal between the telephones. It was impossible, there was no way to display the status of each telephone, and there were many defects such as the operation of the switcher and the restoration of the exact position artificially operated by the main telephone side.

Accordingly, the present invention provides two automatic telephones, including a pushbutton, an electronic buzzer and a light emitting diode, and a port. Consists of a single device using a coupler, IC, transistor, relay, and other electronic devices. The CO line is connected to each of the above devices, and each telephone is connected by 5 wires. Therefore, the desired telephone calls and calls are connected to each other, the outgoing call is connected to the trunk line, the incoming call is connected from the trunk line, and the trunk line is kept in operation while the trunk line is in operation. The state is displayed, and after the completion of the call is restored to its original state without manipulation, the conventional defects are completely solved, with reference to the accompanying drawings, the present invention will be described in detail as follows.

In FIG. 1, the part shown by the dotted line 10 is one apparatus, the part shown by the dotted line 20 is a main telephone, and the part shown by the dotted line 30 is an extension telephone.

Connection terminals L1, L2, ... of the apparatus 10 in a normal trunk line. … … Normal contact of relay 130 of connection 100.. … … Normal contact of relay 110 ... … … Line detector 150. … … Connection terminal 1, 2 of device 10. … … CO line to telephone 21 of original telephone 20… … … The main telephone connection circuit is constructed, and a logic signal of status 1 is provided to the main telephone display circuit 230 of the display unit 200 at the output of the line detector 150, and the status signal is received from the display circuit 230 through a 100mS delay circuit. The information of logic 1 is provided in three places, one of which provides a selection signal to the first input of the AND gate 451 of the selection control circuit 450 of the control unit 400, and the other of the information to the first input of the AND gate 701 of the signal control unit 700. To receive the signal provided from the CO line, and another place to provide a control signal to the first input of the AND gate 443 of the switching call control circuit 440 of the control unit 400 through the 2 seconds (S) delay circuit The reset circuit of the control circuit 440 is prepared.

In addition, choke from DC power supply of connection part 100. Coil 180... … … Normal position of power switch 190... … … Normal contact of relay 140.. … … The power supply circuit is configured, and the state signal of logic 1 is provided to the extension telephone display circuit 210 of the display unit 200 at the output of the line detector 160, and the state signal is received from the display circuit 210 to receive a logic signal through a 100mS delay circuit. It provides three pieces of information, one of which provides a selection signal to the 452 first input of the AND gate of the selection control circuit 450 and the other of which provides the second input of the AND gate 701 of the signal control section 700 to the trunk line. And a control signal to the second input of the AND gate 443 of the switchover call control circuit 440 through the 2 second delay circuit. Prepare the set circuit.

If a 20Hz interrupted signal is received from the trunk line between the connection terminals L1 and L2 of the device 10, the 20Hz interrupted signal is provided to two places, and one is located at the trunk line. … The telephone 21 rings through the main telephone connection circuit. … The line detector 150, which is inserted in series with the telephone connection circuit of the main unit, cannot operate at 20Hz intermittent signal current below the impressed current, and the other one is provided to the signal receiver 600, where two half-wave rectified 20Hz intermittent pulses are provided. And one place the transistor "on" through the second input of the OR gate 237 of the main telephone display circuit 230 so that the negative voltage of the DC voltage passes through the extension telephone operating circuit 330 through the connection terminal 6 of the apparatus 10. 33 is provided to the zener diode 34 to flash the indicator 33 at 20 Hz, and the other is provided to the second input of the AND gate 705 of the signal controller 700. The first input of the AND gate 705 is the main telephone display. The logic 1 signal provided from the circuit 230 and the extension telephone display circuit 210 is sensed by the AND gate 701, and the logic 1 output of the AND gate is coupled through a 300mS delay circuit. Therefore, when the output of the AND gate 705 is a fast 200mS delay circuit (for example, when a pulse of 20 Hz is sent out for 1 second and stopped for 2 seconds is received, a logic 1 is output for 1,2 seconds, and 1.8 is output. A circuit for outputting logic 0 for a second time to turn on the transistor through the first input of the OR gate 534 of the caller 500 so that the negative voltage of the DC voltage passes through the connection terminal 8 of the device 10 to the electronic buzzer 35 of the extension telephone 30. It activates and shows to the extension telephone 30 that the 20Hz intermittent signal is being received from the trunk line and informs by audible signal.

When the main telephone 20 hears a ring tone and responds, the line detector 150 is operated to provide a logic 0 status signal to the main telephone display circuit 230 at its output, and receives the status signal through the 100 mS delay circuit. The AND gate 451 of the selection control circuit 450 is inoperable, the AND gate 701 of the signal control unit 700 is inoperable, and a logic 0 is sent to the AND gate 443 of the switching call control circuit 440 through the 2-second delay circuit. By providing a control signal of, the switching call control circuit 440 is kept in a cell state, and when the control circuit 440 is received in a cell state and receives a status signal of logic 0 provided from the line detector 150, the logic 1 is displayed as indicated by the dotted line. Information is provided in two places, one for providing a selection signal to the first input of the AND gate 451 of the selection control circuit 450, and the other for the first input of the AND gate 236. The second input of the gate 236, together with the second input of the AND gate 216, the pulse generator 430 of the control unit 400 (this pulse generator 430 outputs a logic 1 of the usual, when coupled, it is coupled to the output of 60 IPM (Impulse per Minute)) The logic 1 output of the AND gate 236 "turns on" the transistor through the first input of the OR gate 237 so that the negative voltage of the DC voltage passes through the extension telephone control circuit 330 and through the connection terminal 6 of the device 10 to the extension telephone 30. The main line telephone provided with the indicator 33 and the zener diode 34 has a status display circuit configured to ignite the indicator 33 to indicate that the main telephone 20 is in a call.

When making an outgoing call from the main phone 20 to a trunk line, the user makes a desired call by holding a handset of the phone 21 and dialing. The configuration and display function of the connection circuit are the same as described above.

In the extension telephone 30, lift the handset of the telephone 31 to hear and respond to the 20 Hz intermittent flashing of the indicator 33 and the intermittent operation of the electronic buzzer 35. … The line detector 160 of the power supply circuit is operated, and at the output thereof, a status signal of logic 0 is provided to the extension telephone display circuit 210, and a status signal is received from the fraud display circuit 210, and the 100 mS delay circuit receives the status signal. The AND gate 452 cannot be operated, the AND gate 701 of the signal controller 700 cannot be operated, and a logic 0 control signal is provided to the AND gate 443 of the switchover call control circuit 440 through a 2-second delay circuit. After the switchover call control circuit 440 is set, the control circuit 440 is kept in a set state. When receiving the logic 0 status signal provided from the line detector 160, the information of logic 1 is displayed as indicated by the dotted line. One provides a selection signal to the first input of AND gate 453 of selection control circuit 450, and the other provides the first input of AND gate 216 to the first input of AND gate 216. The two inputs are coupled to the output of the pulse generator 430, so that the transistor is "on" at the output of the AND gate 216 so that the negative voltage of the DC voltage passes through the control unit 310 of the main telephone unit via the connection terminal 7 of the apparatus 10. Extension phone provided with indicator light 23 and zener diode 24. … A status indicator circuit is configured to ignite indicator 23 to indicate that extension telephone 30 is in a call.

When pushbutton 32 is operated momentarily (within 300mS) in extension telephone 30, the positive voltage (VDD) of DC voltage is applied to extension telephone operation circuit 330 through connection terminal 6 of device 10 via pushbutton 32. An extension telephone provided to the AND gate 452 of the selection control circuit 450 and the second input of 453 at the output of 330. … The operation button operation circuit is configured, and logic 1 information is provided to two places at the output of the AND gate 453 provided with the selection signal, and one place is 400mS delay circuit of the calling unit 500 through the first input of the OR gate 456. If the reception time of the operation signal is within 400mS, the transistor cannot be turned "on" and thus the electronic buzzer 25 of the main telephone 20 cannot be operated. The main telephone which operates the electronic buzzer 25 of the main telephone 20 through the terminal 5 of the device 10 by turning the transistor on. … The call signal circuit is configured, and the other is provided to the first input of the AND gate 465 provided with a logic 1 output at the Q output of the mutual call control circuit 410 through the first input of the OR gate 464. The switching call control circuit 440 is set by the logic 1 output, and the switching call control signal of logic 1 is provided to two places at the Q output of the control circuit 440, and one is provided to the pulse generator 430 to start the 60IPM. By outputting the pulse to the display unit 200, the indicator 23 of the main phone 20 in ignition blinks 60IPM, indicating that the extension phone 30 is in communication with the trunk line, and the other place operates the relay 130 of the connection unit 100, and operates the relay 130. by contact with a positive electrode (V _DD) of the direct-current voltage through the normal contact of the operating contacts of the relay 130 and relay 120 are provided in the working circuit of the relay 140 causes a relay 140 operating And, in the trunk ... … Connection terminal L1L2. … Operation contact of relay 130. … Normal contact of relay 120.. … Operation contact of relay 140... … Line detector 160... … Terminal 3,4. … C.O.line with telephone 31 of extension telephone 30… … … The extension telephone connection circuit is configured to answer incoming calls from the CO line, and the status signal of the logic 0 output of the line detector 160 is logic through the 100 mS delay circuit and the 2 second delay circuit of the extension telephone display circuit 210. A control signal of 0 is provided to the AND gate 443 of the switchover call control circuit 440, so that the extension line 30 may interrupt the CO line for a short period of time within 2 seconds. … When the extension telephone connection circuit is maintained, and the handset of the telephone 31 is put in place after the completion of the call, the control signal is switched from logic 0 to logic 1 after 2 seconds, and the logic 1 of the AND gate 443 of the switching call control circuit 440 is maintained. The output is restored to its original state by causing the switchover call control circuit 440 to be reset through the first input of the OR gate 444.

When making an outgoing call from an extension telephone 30 to a trunk line, as described above, the telephone line and the push button 32 are operated as described above. … Establish an extension telephone connection line to make an outgoing call connection, and turn off the indicator 23 of the main telephone 20 to 60 IPM, and indicate that the extension telephone 30 is busy with the trunk line.When the call is completed, the handset of the telephone 31 is in place for 2 seconds. After that, it is restored to its original state.

The mutual call and call connection between the main telephone 20 and the extended telephone 30 has the following operation and circuit configuration.

When the main telephone 20 is in a normal state, a logic signal 1 output from the line detector 150 is provided to the first input of the AND gate 451 of the selection control circuit 450 through the main converter switch circuit 230. When the pushbutton 22 of the switch 20 is operated, the positive voltage (V _DD ) of the DC voltage is applied to the main phone operating circuit 310 through the pushbutton 22 and through the connection terminal 7 of the apparatus 10. Main telephones provided with an operation signal of logic 1 provided to the AND gates 451 of the selection control circuit 450 and the second input of the 454. … The operation button operating circuit is configured, and logic 1 information is provided to three places at the output of the AND gate 451 provided with the selection signal, and one place is via the second input of the OR gate 455, and the 400mS delay of the call unit 500 is provided. An extension telephone for operating the electronic buzzer 35 of the extension telephone 30 through the connection terminal 8 of the device 10 by turning the transistor "on" through the second input of the OR gate 534 through the circuit. … The call signal circuit is configured to call the extension telephone, and the other is provided with the logic 1 information to the S input of the call control circuit 410 through the first input of the OR gate 459 so that the call control circuit 410 is set. The other is RS flip by NAND. RS-flip by NAND provided to the first input of NAND gate 457 coupled to the Q output of flop B, and by the logic 0 output of NAND gate 457. Set flop A, and turn on the transistor of the power supply switch 190 of the connection part 100 by the logic 1 output of the Q output so that the line detector 170 may be inserted into the main telephone side, and the RS flip. If the logic 0 output of the Q output of flop A is provided to the second input of the NAND gate 458 to render the NAND gate 458 inoperable and the mutual call control circuit 410 is set, the mutual call control of logic 1 at the Q output. Signals are provided to the operation circuits of the relays 110 and 120 of the connection part 100 so as to operate them. … Choke, coil 180... … Line detector 170. … Operation position of main telephone of power switch 190... … Operation contact of relay 110. … Line detector 150. … Connection terminal of the device 10, 1,2. … In-house telephone 20 In-phone 21 … The power supply circuit is configured, the operation circuit of the relay 140 is opened at the operating contact of the relay 120, the starting circuit of the melody transmitter 101 is installed, … The extension telephone side of the extension telephone connection circuit is opened, and the output side of the melody transmitter 101 is connected to the trunk line. Prepare a circuit for sending out the waiting signal sound. The telephone 31 of the extension telephone 30 is an extension telephone. … Connected to the power supply circuit, the main line telephone 20 and the extension telephone 30 are choke. When the mutual call is made by the stone coupling by the coil 180 and the call control circuit 410 is set, the first input of the AND gate 705 is inputted through the OR circuit by the diode coupling of the signal controller 700 when the call control circuit 410 is set. If a 20Hz intermittent signal is received from the trunk line during a mutual call by providing a logic 1 to the controller, the control unit converts the intermittent signal to operate the electronic buzzer 35 of the extension telephone 30, and the logic 0 output of the Q output is the AND of the selection control circuit 450. It is provided to the input of the gate 465 to cut off the set input circuit of the switching call control circuit 440, and when the reciprocal call control circuit 410 is set, it dmls to the 4-second delay circuit and maintains the set state for 4 seconds. If the handset of 21 is within 4 seconds of the mutual call control circuit 410 being set, the main telephone. … A control signal of logic 0 is provided to the talk control circuit 410 at the output of the line detector 170 inserted into the power supply circuit, and the control signal is kept in the cell state through the 300mS delay circuit. In addition, main telephone… … Main telephone by the status signal of the line detector 150 inserted in the power supply circuit. … The indicator 33 of the extension telephone 30 is ignited by the status display circuit to indicate the state of the main telephone 20.If the handset of the telephone 31 of the extension telephone 30 is lifted, the status signal of logic 0 is transferred from the line detector 160 to the extension telephone display circuit 210. Extension phone provided with… … The indicator 23 of the main telephone 20 is ignited through the status display circuit to display the status of the extension telephone 30. After completion of the call, the handset of the telephone 21 of the main telephone 20 is replaced. … The control signal of the logic 1 output of the line detector 170 inserted in series with the power supply circuit causes the call control circuit 410 to be reset after 302mS through the 300mS delay circuit of the call control circuit 410, and the reset pulse is selected. RS flip by NAND of circuit 450. The RS flip is provided at the R inputs of flops A and B. Restore flops A and B to their original state.

When the extension telephone 30 is in a normal state, the logic 1 phase change signal output from the line detector 160 is provided to the first input of the AND gate 452 of the selection control circuit 450 through the extension telephone display circuit 210. If push button 32 of extension telephone 30 is activated, extension telephone… … The operation signal is provided to the selection control circuit 450 by the operation button operation circuit so that the information of logic 1 is provided to three places at the output of the AND gate 452 where the selection signal is provided. Main telephone through… … The call signal circuit is operated by calling the electronic buzzer 25 of the main telephone 20, and the other part is provided with the logic 1 information at the S input of the call control circuit 410 through the second input of the OR gate 459, so that the call control circuit 410 is set and another one is RS flip by NAND. R-S flip by NAND provided by the first input of NAND gate 458 coupled to the Q output of flop A, by the logic 0 output of NAND gate 458. Set flop B to turn on the transistor of the power supply switch 190 of the connection section 100 by the logic 1 output of the Q output so that the line detector 170 is inserted into the expansion telephone side, and the AND gate 446 of the switching call control circuit 440 RS flip which is provided to a 1st input, and prepares the reset circuit after switching call connection. The logic 0 output of the Q output of flop B is provided to the second input of the NAND gate 457 to render the NAND gate 457 inoperable, and if the call control circuit 410 is set, the set state is set by a four-second circuit. And by supplying the logic 1 mutual call control signal at the Q output to the relay 110, 120 operating circuit of the connection part 100 to operate them, … Choke. Coil 180... … Normal position of power switch 190... … Relay 110 is working contact… … Line detector 150. … Connection terminal 1, 2 of device 10. … Telephone 21 inherent in telephone 21. … The power supply circuit is constructed, and the direct current power source. … Choke. Coil 180... … Line detector 170. … Operation position of extension telephone of power switch 190... … Normal contact of relay 140.. … Line detector 160... Terminal 3,4. … Extension telephone with telephone 31. … The power supply circuit is configured to communicate with each other, and the subsequent operation, circuit configuration, and display function are the same as when configuring the interconnection connection circuit at the main telephone.

During a call with a CO line, the CO line is switched to the other phone axis.

Main telephone 20 is trunk line… … The logic 0 status signal outputted from the line detector 150 during the call with the main line via the main telephone connection circuit is provided to the first input of the AND gate 454 of the selection control circuit 450 through the main telephone display circuit 230. And the main phone via AND gate 236. … When the pushbutton 22 of the main telephone 20 is operated while the indicator 33 of the extension telephone 30 is ignited by the status display circuit and the status of the main telephone 20 is displayed, the main telephone. … The operation signal of logic 1 is provided to the selection control circuit 450 by the operation button operation circuit so that the information of logic 1 is provided to two places at the output of the AND gate 454 where the selection signal is provided. Extension telephone through one input… … The electronic signal 35 of the extension telephone 30 is operated by the call signal circuit, and the other part is provided to the first input of the AND gate 465 coupled to the Q output of the talk control circuit 410 by the second input of the OR gate 464. Logic 1 information is provided from the output of the gate 465 to the S input of the switching call control circuit 440 so that the switching call control circuit 440 is set. … It is the same as when constructing expansion converter connection circuit. … The telephone connection circuit of the main telephone is opened, so that the line 1 signal of the logic 1 in the line detector 150 counts the main telephone display circuit 230 and selects the selection signal of logic 1 100 ms after the 100 mS delay circuit selects the AND gate 451 of the control circuit 450. It is provided in one input and is main telephone… … Logic 1 information is provided at the output of the AND gate 451 by the operation signal by the operation button operation circuit. … The call signal circuit is operated by calling the electronic buzzer 35 of the extension telephone 30, and the other part is provided to the S input of the call control circuit 410 through the OR gate 459, so that the call control signal is provided to the connecting part 100. And 120 are activated, and another is flipping the RS by the NAND through the NAND gate 457. By supplying logic 0 to the S input of flop A and counting it, the transistor of the power supply switch 150 of the connection part 100 is "on" to turn on the line detector 170. … It is inserted in series to the power supply circuit, and the main telephone is connected by the operation contact of the relay 110. … The power supply circuit is configured and the relay 130 is operated by the switching call control signal, so that the positive voltage (V _DD ) of the DC voltage passes through the operating contact of the relay 130. Through the operating contact of the relay 120, the Melody transmitter 101 is activated in response to the input of the Melody transmitter 101, through the operating contact of the relay 120 at the output of the Melody transmitter 101, and through the operating contact of the relay 130. Melody via L2 via L2. A beeper sound connection circuit is provided for transmitting the beeing signal, and the relay 120 is operated by the operation of the relay 120 to restore the improver 140, and the extension 140 is restored by the recovery of the relay 140. … The power supply circuit is composed of the main telephone. … By establishing a mutual call path between the power supply circuits, the main phone is notified of the extension line call connection from the main phone side to the extension phone side.

If the handset of the telephone 21 of the telephone 20 of the main telephone 20 is put in place after the notification of the telephone line connection, … At the output of the line detector 170 of the power supply circuit, a control signal of logic 1 is provided to the call control circuit 410, and the call control circuit 410 is reset after 300mS through the 300mS delay circuit at the call control circuit 410. The signal is removed and the relays 110 and 120 are restored, so that the trunk line is changed by the switching call control signal. … The extension telephone connection circuit makes a call with the trunk line at the extension telephone 31. The subsequent operation, circuit configuration and display function are the same as for the outgoing call connection from the extension telephone 30 to the trunk line.

Extension Phone 30 … The logic 0 selection signal output from the line detector 160 is supplied to the first input of the AND gate 453 of the selection control circuit 450 through the extension telephone display circuit 210 during the call with the trunk line through the extension telephone connection circuit. And an extension telephone via AND gate 216. … If the indicator 23 of the main telephone 20 is blinked by 60 IPM intermittent by the status display circuit and the push button 32 of the extension telephone 30 is operated while the status of the extension telephone 30 is being displayed, the extension telephone… … The operation signal of logic 1 is provided to the selection control circuit 450 by the operation button operation circuit so that the information of logic 1 is provided to two places at the output of the AND gate 453 where the selection signal is provided. 1 phone through 1 input… … The call signal circuit operates the switching buzzer 25 of the main telephone 20 and calls the other through the first input of the OR gate 464 and the S input of the switching call control circuit 440 through the first input of the AND gate 465. With provided, hook of extension phone 30, phone 31. When the switch is interrupted momentarily (within 100 ms or more and 2 seconds), the logic signal 1 in the circuit detector 160 transmits the selection signal of logic 1 to the first input of the AND gate 452 of the selection control circuit 450 after 100 ms. Extension phone provided with… … The logic 1 information is provided at the output of the AND gate 452 to three places by the operation signal by the operation button operation circuit, and one place is provided through the second input of the OR gate 456. … The call signal circuit operates and operates the electronic buzzer 25 of the main telephone 20, and the other is applied to the S input of the call control circuit 410 through the second input of the OR gate 459, so that the control circuit 410 is counted, The relays 110 and 120 are operated by providing a mutual call control signal of 1 to the connection 100, and another is an RS flip through the NAND gate 458. It is provided to the S input of the flop B and counts, so that the line detector 170 of the connection part 100 is expanded. … And the logic 1 information is supplied to the first input of the AND gate 446 of the switching call control circuit 440 to reset the switching call control circuit 440 by the reset pulse of the call control circuit 410. Prepare the circuit to be set, and install the main telephone by the operation contact of the relay 110. … Since the power supply circuit is configured and the relay 130 is operated by the switching call control signal, the standby signal sound connection circuit is formed by the operating contact of the relay 130 and 120. After the trunk line is opened for 100mS, Melody. The standby signal is sent to the trunk line, and the operation circuit of the relay 140 is restored by the operation of the relay 120. … When the power supply circuit is configured to notify the main line switching call connection by the main telephone 20 and the intercommunication path, and the handset of the telephone 31 of the facility telephone 30 is in place, the control signal of logic 1 is controlled at the output of the line detector 170. Provided to the circuit 410, which causes the call control circuit 410 to be reset after 300 ms through a 300 mS delay circuit in the control circuit 410, and RS reset by the reset pulse. Resetting flops A and B, and providing logic 1 to the second input of NAND gate 446 through inverter 445 of switchover call control circuit 440, so that the logic 1 output of AND gate 446 receives the second input of OR gate 444. Is provided to the reset circuit of the switchover call control circuit 440, and the control circuit 440 is reset to reset the trunk line. … The telephone line 21 is connected to the telephone 21 by the main telephone connection circuit. In other words, if you want to switch the CO line to the other party's phone during the CO line call, you can call the other party by operating the push button on the piece side, announce the CO change call by the mutual call by mutual channel, Hook for extension telephone only when the transfer call is connected to the main telephone. When the switch is operated in a forward price (more than 100mS within 2 seconds) to establish a mutual call path, advertise the trunk line telephone call, and when the handset of the telephone of the operating side is put in place, the transfer call connection is made to the other side with the trunk line in operation. .

2 is a detailed circuit diagram of the connection part 100. The part shown by the dotted line A is the operation circuit of the bistable relay, and the output of the relaxation amplifier IC ₁ is connected to the base of the PNP switching transistor TR2 of the NPN switching transistor TR1, and is used for charging / discharging the emitter of the transistor ) The other end of the capacitor C1 is connected to the S terminal of the binocular relay RE1, and the R terminal of the binocular relay RE1 is connected to the lower end of the resistor R1 for supplying the negative pole of the DC voltage. The connection point between R1 and R terminal of bistable relay RE1 is connected to the collector of PNP switching transistor TR2, the other end of resistor R1 is connected to the negative pole of DC voltage, and the collector of NPN switching transistor TR1 is DC voltage. Connected to the positive pole (V _DD ) of the double-safety relay, and the high level of logic 1 at the output of the slack amplifier IC1 is the NPN switching transistor. When applied to the base of the transistors TR1 and PNP switching transistor TR2, the NPN switching transistor TR1 is "on" and charged while applying the DC voltage positive pole (V _DD ) to the S terminal of the bistable relay RE1 through the capacitor C1. When the bistable relay RE1 is kept in operation and the low level of logic 0 at the output of the shrinking amplifier IC1 is applied to the base of the NPN switching transistor TR1, the transistor TR ₂ is "off" and the transistor PNP is "on". The high-level charge charged in the capacitor C1 is applied to the R terminal of the bistable relay RE1 via the transistor TR2 to discharge and reset the bistable relay RE1 to restore the bistable relay. The bistable relay does not require operating current and is small in size, light weight and sealed, so there is no failure, but the price is high.

The part shown by the dotted line B is normally the operating circuit of the relay, and the output of the inverter IC2 is connected to one end of the 20mS time constant resistor R2 and one end of the voltage divider resistor R5, and the other end of the resistor R2 is connected to the protective resistor R3. If one end is connected, the other end of resistor R3 is coupled to the [input] of NAND gate IC3, and the connection point between R3 of resistor R2 is connected to one end of 20mS time constant capacitor C2, and the other end of capacitor C2 Is connected to the negative pole of the DC voltage positive pole (V _DD ) which is coupled to the second input of the NAND gate IC3 to form a 20mS delay circuit by CR time constant, and the output of the NAND gate IC3 is at one end of the protective resistor R4. The other end of resistor R4 is connected to the base of the PNP switching transistor TR4, the transistor TR4 being the collector of one coil of the relay RE2 and a protective diode. The negative pole of D and one end of the relay current reducing resistor R7 are connected, the negative pole of the DC voltage is connected to the positive pole of the diode D and the other coil of the relay RE2, and the other end of the resistor R5 is connected to the one of the distribution resistor R6. And the emitter of the transistor TR3 is connected to the other end of the resistor R6 and the anode of direct current voltage (V _DD ) and the emitter of the transistor TR3 is connected to the other end of the resistor R7. Connected to the emitter of transistor RE4, the transistor TR3 is " off " since the high level output of logic 1 of inverter IC2 is normally applied to the base of PNP switching transistor RE3 via voltage divider resistors R5 and R6. In addition, since logic 1 is applied to the first input of the NAND gate IC3 through the 20mS delay circuit by the CR time constant circuit, the low level of logic 0 of the NAND gate IC3 is applied. Is applied to the base of the PNP switching transistor TR4 through the protective resistor R4, so that the transistor TR4 is in the "on" state, but the emitter of the transistor TR4 is in the low level, so that no current flows in the relay RE2, and the input to the input of the inverter IC2. When logic 1 is applied, the low level output of logic 0 of inverter IC2 is applied to the base of transistor TR3 through distribution resistors R5 and R6, so that transistor TR3 is "on" and the low level of logic 0 of NAND gate IC3. An output is applied to the base of the PNP switching transistor TR4 via the resistor R4, and the transistor TR4 is in the "on" state, so that it is a RE2 relay through the transistors TR3 and TR4 at the positive voltage V _DD of the DC voltage. The operating circuit of the relay RE2 is constructed and operated with the negative pole of the DC voltage, and after the 20mS delay circuit by the CR time constant, the NAND gate IC3 A high level output of 1 is applied through the resistor R4 to the base of the PNP switching transistor TR4, causing the transistor TR4 to be "off" and thus a resistor R7 series for flowing the holding current required for the relay RE2 to the operating circuit of the relay RE2. By keeping the relay RE2 in operation, the relay operation holding current is reduced, and the diode D and the resistor R7 are intended to prevent the transistor TR3 from being damaged by the overcurrent caused by the induced voltage when the relay RE2 is restored. The operation and holding current of the relay is required, which is larger and less expensive than the bistable relay.

The operation circuits of the relays 110, 120, 130, and 140 may be optionally used among the above degrees A or B.

Porto. Photo-Coupler 151, 152, 161, 162 and 171 are completely isolated between the input (diode) and output (transistor), and the signal transmission is general formation, so there is no influence from the output signal to the input side, Easy to connect with, no contact, long service life, fast response speed (less than 10us, small volume, light, vibration and shock, low price, 10 ohm impedance for AC 800Hz) Ohm) or less, and the minimum current is 10 mA. The part shown by dashed line 150 is the circuit diagram of the line detector, and the photodiode of the coupler is connected to the diode cathode of the coupler and the coupler. The diode cathode of the coupler 151 is connected to the diode anode of the photocoupler 152 and is provided by the telephone station between the diode anode and the cathode of the photocoupler 151,152. The input of the line detector 150 is connected by connecting a current classifying resistor 153 in parallel so that the photocoupler 151,152 does not operate for the 20Hz intermittent signal current, but operates for the through current, and the emitter of the transistor of the photocoupler 151,152 One end of resistor 154 connected to a negative pole of direct current voltage, to provide a high level of logic one, and the other end of the resistor 154 to a positive pole of direct current (V _DD ); It is connected to the collector of 152 and constitutes the output of the line detector 150.It usually outputs the status signal of logic 1 through the resistor 154 at the anode of DC voltage (V _DD ), and the call current is independent of the polarity of the trunk line. A port that flows through a diode of the Potato coupler 151 or 12 turns the transistor "on" and outputs a negative voltage of DC voltage, that is, a status signal of logic 0 Constitute a circuit of chulgi 150.

With this structure and principle, the part shown by dashed line 160 is Poto. The circuit of the line detector 160 including the coupler 161, 162, the resistors 163 and 164, and the part shown by the dotted line 170 are POTO. It constitutes a circuit of a line detector 170 including a coupler 171, resistors 172, and 173, and the line detector 170 outputs a control signal of logic 1 in normal operation, and controls a control signal of logic 0 in the operating state to a third degree and mutual call control. A second input of the NAND gate 416 of the circuit 410 is output.

Choke. Coil 180 is a low impedance to DC, a high impedance to voice band frequency to supply DC power to the telephone, and is a stone power supply and low loss communication line coupling coil.

The dotted line 190 is a power switch circuit that operates in the same manner as the transfer relay contact by using a transistor, and the collector of the PNP switching transistor 192 and the collector of 196 in series is connected to the C contact of the relay 110. The base of transistor 192 is connected to the output of NAND gate 460 of FIG. 3 via resistor 191, the base of transistor 196 is connected to the output of NAND gate 461 of FIG. 3 through resistor 195, and transistor 192 The emitter of the choke. An end of the 182 coil of the coil 180 and the other input of the line detector 170, the emitter of the transistor 196 is connected to one input of the line detector 170, the RS flip by the NAND of the selection control circuit 450 in the normal state. The transistor 192 is "on" and the transistor 196 is "off" by the reset signal provided from the flop circuit, and the positive pole V _DD of the DC voltage is choked. The RS flip through the coil 180 and through the transistor 192 to the C contact of the relay 110. When the cell signal is provided from the flop circuit, the transistor 192 is "off", and the transistor 106 is "on" so that the positive voltage V _DD of the DC voltage is choked. A main telephone telephone power supply switching circuit is provided through the coil 180, through the line detector 170, and provided to the C contact of the relay 110 through the transistor 196. The collector 198 collector with the PNP switching transistor 194 is serially connected. The connection is connected to the e contact of relay 140, and the base of transistor 194 is connected to the output of NAND gate 462 of FIG. 3 through resistor 193, and the base of transistor 198 is connected to NAND gate of FIG. Connected to the output of 463, the emitter of transistor 194 choke. It is connected to one end of the 182 coils of the coil 180 and the other input of the line detector 170, and the emitter of the transistor 198 is connected to one input of the line detector tool 170 to configure the power supply switching circuit of the extension telephone, and the operation is described above. It is the same as the power supply switching circuit on the telephone side.

The contact terminal L1 of the device 10 to be connected to one side of the trunk line is connected to the contact b of the relay 130, the contact e of the relay 110 is connected to the contact 130 a, and the contact f of the relay 110 is connected to the line detector 150). The other input of the line detector 150 is connected to the input terminal 1 of the device 10 to be connected to one side of the telephone 21, and to the terminal L2 of the device 10 to be connected to the other side of the trunk line. The contact a is connected, and the contact b of the relay 110 is connected to the connection terminal 2 of the device 10 to which another Hanzgo of the telephone 21 is connected. … This telephone connection circuit is constructed. The cathode of DC voltage is choke. The other end of the 181 coil is connected to contact a of relay 140 and contact g of relay 110, contact b of relay 140 is connected to one input of line detector 160, The other input of the line detector 160 is connected to the terminal 3 of the device 10 to be connected to one side of the telephone 31, and the terminal f of the relay 140 is connected to the terminal 4 of the device 10 to be connected to the other side of the telephone 31. The e contact of relay 140 is connected to the output of the expansion telephone side of power switch 190, the emitters of transistors 196 and 198 are connected to one input of line detector 170, and the emitters of transistors 192 and 194 are connected to the other of line detector 170. One input and choke. It is connected to one end of the 182 coil of the coil 180, the other end of the 182 coil is connected to the anode (V _DD ) of the DC voltage ... … The power supply circuit is constructed. The contact a of relay 120 is connected to the operation circuit of relay 140 and one end of resistor 102 for providing logic 0, the other end of resistor 102 is connected to the negative pole of DC voltage, and the contact b of relay 120 is 130 g of relay. The contact of is connected to the contact, the c contact of 120 is connected to the input of the melody transmitter 101, the e contact of the relay 120 is connected to the c contact of the relay 140, the f contact of the relay 120 is the c contact of the relay 130 The g contact of 120 is connected to one end of the melody transmitter 101 on the output side, the other end of the output side of the melody transmitter 101 is connected to the g contact of the relay 140 and the connection terminal L2 of the device 10, and the f contact of the relay 130 The output of the line detector 150 is connected to the input of the inverter 231 of the display circuit 230 of FIG. 3 in the main circuit of FIG. 3, and the output of the line detector 160 is connected to the Coupled to the input of the inverter 211 of the display circuit 210, the output of the line detector 170 coupled to the second input of the NAND gate 416 of the third degree call control circuit 410, the relays 110 and 120 operating circuit D flip of the call control circuit 410. It is coupled to the Q output of the flop 411, and the operating circuit of the relay 130 is the D flip of the third degree switching call control circuit 440. It is coupled to the Q output of flop 411.

D flip of the switching call control circuit 440. When the switching call control signal of logic 1 is supplied to the operating circuit of the relay 130 from the Q of the prop 441, the relay 130 is operated and the positive voltage (VDD) of the DC voltage of the logic 1 is applied to the f, g operating contact of the relay 130. Is applied to the operation circuit of the relay 140 through the a and b normal contacts of the relay 120, so that the relay 140 is kept in operation. … Connection terminal L1. … B, c operating contact of relay 130. … E, f normal contact of relay 120 ... … B, c operating contact of relay 140. … Line detector 160... … Connection terminal 3 of device 10. … Telephone 31. … Connection terminal 4 of device 10. … F, g operating contact of relay 140. … Terminal L2 of the device 10. … C.O. by C.O. … The extension telephone connection circuit is configured to make outgoing call connection from the extension telephone 30 to the trunk line and incoming call connection from the trunk line.

CO line by the switching call control signal. … D flip of the mutual call control circuit 410 after configuring the extension telephone connection circuit. When the mutual call control signal of logic 1 is supplied from the Q of the flop 411 to the operation circuits of the relays 110 and 120, the relays 110 and 120 are kept in operation, and the relay circuits 120 operate by opening the a and b normal contacts of the relay 120. The relay 140 is restored by opening the voltage, and the positive voltage VDD of the DC voltage is applied to the input of the melody transmitter 101 through the f and g operating contacts of the relay 130 and through the b and c operating contacts of the relay 120, and then the melody transmitter 101 is connected. Maneuver, on the national line… … Connection terminal L1... … B, c operating contact of relay 130. … F, g operating contact of relay 120. … Output of melody transmitter 101… … Connection terminal L2... … Standby sound connection circuit is composed of trunk line to loop and maintain operation. It transmits a waiting signal to the trunk line and expands the telephone by restoring the relay 140. … The power supply circuit is constructed, and the operation of the relay 110 causes the negative voltage of the direct current voltage. … Choke. 181 coils of coil 180... … F, g operating contact of relay 110. … Track detector… … 150... … Connection terminal 1.. … Telephone 21. … Connection terminal 2.. … B, c operating contact of relay 110. … Main phone side output of power switch 190... … (When operated on the main telephone side, the line detector 170) … Choke. 182 coils of coils 180... … DC voltage anode (VDD), (operated from expansion telephone). … Choke. 182 coils of coils 180... … This is a telephone with a direct current voltage (VDD). … The power supply circuit is combined with a stone to form a mutual call path, so that the main telephone and the extension telephone make mutual calls.

When the current of logic 1 and line detector 150 flows from the output of line detector 150 to the input of line detector 150, the current signal of logic 0 is supplied to the main telephone system by the inverter 231 of the circuit 230. Normally from the output of 160, if a current of more than the minimum sense current flows through the input of logic 1, the line detector 160, the status signal of logic 0 is supplied to the input of the inverter 211 of the extension telephone display circuit 210, and from the output of the line detector 70 For example, when a current of more than the minimum sense current flows through the input of logic 1 and the line detector 170, the control signal of logic 0 is provided to the second input of the NAND gate 416 of the call control circuit 410.

3 is a detailed circuit diagram of the display unit 200, the operation unit 300, and the control unit 400.

The display unit 200 includes the main telephone display circuit 230 and the extension telephone display circuit 210, and the part shown by the dotted line 230 is the main telephone display circuit diagram.

The state signal output from the line detector 150 of FIG. 2 is received by the inverter 231, and the output of the inverter 231 is directly coupled to the first input of the AND gate 239 and the first input of the AND gate 454 of the selection control circuit 450. One end of the 100 mS time constant resistor 232 is connected, the other end of the resistor 232 is connected to one end of the protective resistor 234, the other end of the resistor 234 is coupled to the input of the inverter 235, and the connection point between the resistors 232 and 234 is 100 mS. One end of the time constant capacitor 233 is connected, the other end of the capacitor 233 is connected to the negative pole of the DC voltage, and the second input of the AND gate 236 and the second input of the AND gate 216 are outputs of the inverter 433 of the pulse generator 430 Coupled to the output of the AND gate 236 is coupled to the first input of the OR gate 237, and the second input of the OR gate 237 is connected to the AND gate 705 of the signal controller 700 in FIG. Coupled to a second input, the output of the OR gate 237 is connected to one end of the protective resistor 238, the other end of the resistor 238 is connected to the emitter of the NPN switching transistor 239 to a negative pole of direct current voltage, Is connected to one end of the voltage drop and protective resistor 239, the other end of the resistor 240 is connected to one end of the voltage drop resistor 240, and the other end of the resistor 331 is shown in FIG. And the output of inverter 235 is the first input of AND gate 451 of the selection control circuit 450 and the AND gate 701 of the signal control section 700 of the signal control unit 700. Is directly coupled to the first input of a second, connected to one end of a 2 second time constant resistor 241, the other end of the resistor 24 to one end of a protective resistor 243 And the other end of the resistor 243 is coupled to the first input of the AND gate 443 of the switching call control circuit 440, and the connection points such as the resistors 241 and 243 are connected to one end of the 2 second time constant capacitor 242. The other end of the capacitor 242 is connected to the negative pole of the DC voltage to form the main phone display circuit 230.

When the telephone 21 of the main telephone 20 is in a normal state, the status signal of logic 1 provided at the output of the line detector 150 of the connection diagram 100 of FIG. 2 is sensed by the inverter 231, and the logic 0 output of the inverter 231 is connected to the AND gate 236. The first input and the first input of the AND gate 454 of the selection control circuit 450, the two AND gates are inoperable, the 100mS delay circuit and the inverter 235 by the CR time constant composed of resistors 232,234 and capacitor 233 The selection signal of logic 1 is provided to the first input of the AND gate 451 of the selection control circuit 450, and is also provided to the first input of the AND gate 701 of the signal control section 701 of FIG. 4 to receive a signal from the trunk line. In addition, a logic 1 control signal is provided to the first inlet of the AND gate 443 of the switching call control circuit 440 through a 2-second delay circuit having a CR time constant composed of resistors 241, 243 and a capacitor 242. By preparing the reset circuit of the control circuit 440 and lifting the handset of the telephone 21 of the main telephone 20, the status signal of logic 0 provided at the output of the line detector 150 of the connection diagram 100 of FIG. 2 is sensed by the inverter 231. The logic 1 output of the inverter 231 disables the AND gate 451 of the selection control circuit 450 through the 100 mS delay circuit, disables the AND gate 701 of the signal control unit 700 of FIG. By providing the control signal of the logic 0 to the input of the AND gate 443 of the switching call control circuit 440, the control circuit 440 is maintained even if the trunk line is interrupted for a short time within 2 seconds after the control circuit 440 is cellized, In addition, the logic 1 output of the inverter 231 provides a select signal to the first input of the AND gate 454 of the selection control circuit 450 and passes through the first input of the AND gate 236 coupled to the output of the pulse generator 430. A high level of logic 1 is applied to the base of the NPN switching transistor 239 through the first input of the OR gate 237 coupled to the second input of the AND gate 705 of the signal control unit 700 to "turn on" the transistor 239, The negative electrode of the voltage is supplied to the indicator light 33, 1/2 VDD zener diode 34 of the extension telephone 30 through the terminal 6 of the device 10 through the transistors 239 and the voltage drop resistors 240 and 331. … The indicator 33 lights up by means of an ecological indicator circuit, indicating that the main telephone 20 is in a busy state.

The dotted line 210 is an enlarged telephone display circuit diagram. The state signal output from the electoral detector 160 of FIG. 2 is received by the inverter 211, and the output of the inverter 211 is the first input of the AND gate 219 and the selection control circuit. Directly coupled to the first input of an AND gate 453 of 450, connected to one end of a 100mS time constant resistor 212, the other end of resistor 212 is connected to one end of protective resistor 214, and the other end of resistor 214 to inverter 215 The connection point between resistors 212 and 214 is connected to one end of the 100mS time constant capacitor 213, the other end of the capacitor 213 is connected to the negative pole of a DC voltage, and the output of the AND gate 216 is connected to the protective resistor 217. One end of the resistor 217 is connected to the base of the NPN switching transistor 218, and the emitter of the transistor 218 is directly A cathode of the voltage, the collector of transistor 218 is connected to one end of the drop and protective resistor 219, the other end of the resistor 219 is connected to one end of the resistor 311, The other end is connected to the negative terminal of the indicator 3 of the main telephone 20 of FIG. 4 and the terminal 5 of the device 10 to be connected to one end of the pushbutton 22, and the output of the inverter 215 is connected to the AND gate first input of the selection control circuit 450. 4 is directly coupled to the second input of the AND gate 701 of the signal control unit 700, and is connected to one end of the 2 second time constant resistor 220, and the other end of the resistor 220 is connected to one end of the protective resistor 222. The other end of the resistor 222 is coupled to the second input of the AND gate 443 of the switching call control circuit 440, and the connection point between the resistors 220 and 222 is a 2 second (S) time constant capacitor 221. Is connected at the end, the other one end of the capacitor 221 is connected to the negative electrode of the direct-current voltage is a 210 configured extension phone display circuit.

When the telephone 31 of the extension telephone 30 is in the normal state, the status signal of logic 1 provided at the output of the line detector 160 of the connection diagram 100 of FIG. 2 is sensed by the inverter 211, and the logic 0 output of the inverter 211 is connected to the AND gate 216. The first input and the first input of the AND gate 453 of the selection control circuit 450, the two AND gates are inoperable, the 100mS delay circuit and the inverter 215 by the CR time constant composed of resistors 212,214 and capacitor 213 The selection signal of logic 1 is provided to the first input of the AND gate 452 of the selection control circuit 450, and is also provided to the second input of the AND gate 701 of the signal control section 700 to receive a signal from the trunk line. And a logic 1 control signal to the second input of the AND gate 443 of the switching call control circuit 440 through a 2 second (S) delay circuit with a CR time constant composed of resistors 220,222 and capacitor 221. Preparing a reset circuit of the control circuit 440, and lifting the handset of the telephone 31 of the extension telephone 30, the status signal of logic 0 provided at the output of the line detector 160 of the connection diagram 100 of FIG. 2 is sensed by the inverter 211, The logic 1 output of the inverter 211 disables the AND gate 452 of the selection control circuit 450 and the AND gate 701 of the signal controller 700 of FIG. 4 through a 100mS delay circuit. In addition, the control signal of logic 0 is provided to the input of the AND gate 443 of the switching call control circuit 440 through the 2-second (S) delay circuit, and the control is performed even after the control circuit 440 is set and the trunk line is interrupted for a short time within 2 seconds. The logic 1 output of the inverter 211 provides a selection signal to the first input of the AND gate 453 of the selection control circuit 450 and is coupled to the output of the pulse generator 430, the logic 1 output of the inverter 211 being held by the circuit 440. A high level of logic 1 is applied to the base of the NPN switching transistor 218 through an input to " on " the transistor 218, the cathode of the direct voltage being connected via the transistor 218 and through the voltage drop resistors 219 and 311 to connect the device 10. Extension telephones applied to indicator 23 and 1/2 VDD Zener diode 24 of main telephone 20 via terminal 5.. … A status indicator circuit ignites indicator 23 to indicate that extension telephone 30 is in a call.

The operation unit 300 includes the main telephone operation circuit 310 and the extension telephone operation circuit 330.

The dotted line 310 is a circuit diagram of the main telephone telephone operation. One end of the push button 22 of the main telephone 20 of FIG. 4 is connected to the cathode of the LED indicator 23, and the anode of the indicator 23 is 1/2 VDD zener diode. A cathode of the zener diode 24 is connected to the other end of the pushbutton 22, one end of the electronic buzzer 25 and the connection terminal VDD of the device 10, and the other end of the electronic buzzer 25 is connected to the device 10; Is connected to terminal 7, the connection point between pushbutton 22 and indicator light 23 is connected to connection terminal 5 of device 10, and the connection point between resistors 311 and 219 is connected to the cathode of 3/5 VDD Jenny diode 312. The anode of the diode 312 is connected to one end of the protective resistor 313, the other end of the resistor 313 is connected to the base of the NPN switching transistor 314, and the emitter of the transistor 314 is directly connected. One end of a resistor 315 for supplying a positive voltage (VDD) of a direct current voltage is connected to a positive pole (VDD) of a direct current voltage, and the other end of the resistor 315 is coupled to an input of an inverter 316. And an output of the inverter 316 is coupled to an AND gate 451 of the selection control circuit 450 and a second input of the 454 to constitute the main telephone operation circuit 310.

Normally, the VDD potential of the FIG. 4 main telephone 20 is applied to a 1/2 VDD zener diode 24, and the brake of the zener diode 24 is performed. The potential of 1/2 VDD exceeding the break down voltage is passed through terminal 5 of device 10 via indicator light 23 through a drop in voltage drop (resistance of resistor 311 and resistor 219 is the same). The 3/5 VDD zener diode 312 and the voltage drop and protective resistor 219 are applied to the collector of the transistor 218, wherein the 3/5 VDD zener diode 312 is applied to the brake of the zener diode 312. When the potential of 1/2 VDD below the down voltage is not able to talk, and when the extension telephone 30 is in a call, the potential of 1 / 2VDD passing through 1 / 2VDD ZenerDied 24 is displayed as an indicator 23 (resistance free for convenience). That is, it is assumed that 0 ohms), and through the terminal 5, the voltage drop resistor 311 drops to 1/4 VDD potential, and the remaining 1 / 4VDD potential is 3/5 VDD Zener diode 312. And the indicator V 23 of the main telephone 20 is ignited, and the 3/5 VDD zener diode 312 is applied to the brake of the zener diode 312. The potential of 1/4 VDD below the down voltage cannot pass. When the pushbutton 22 of the main telephone 20 is operated in the above state, the VDD potential is pushed through the pushbutton 22, and the voltage is dropped through the connection terminal 5. The other half of the VDD potential dropped by the resistor 311 is applied to the 3/5 VDD zener diode 312, the voltage drop and the protective resistor 219, and the half VDD potential of the resistor 219 drops. When the pushbutton 22 is operated during the ignition of the indicator 23 or during the ignition of the indicator 23, the 3/5 VDD zener diode 312 is subjected to a potential below the brake and down voltage of the zener diode 312. When no current flows and the extension telephone 30 is in a normal state, the potential of V _DD is pushed through the pushbutton 22 while the pushbutton 22 of the main telephone 20 is operated. / 5 VDD Too it is applied to the collector of the NPN Switching transistor 218 through the diode 312 and the voltage drop Greater protection resistor 219, 3/5 VDD brakes of the Zener diode 312. The potential of 2/5 VDD exceeding the down voltage is "on" the transistor 314 by applying a high level to the base of the NPN switching transistor 314 through a protective resistor 313, and direct current through the emitter, collector of the transistor 314. An extension telephone is provided by the main telephone operation button operating circuit provided with a negative voltage of the voltage provided at the input of the inverter 316, and an operation signal of logic 1 at the output of the inverter 316 is provided at the AND gate 451 of the selection control circuit 450 and the second input of the 454. Call 30 and set the control circuit provided with the selection signal.

The dotted line 330 is an extension telephone operation circuit diagram, and one end of the pushbutton 32 of the extension telephone 30 of FIG. 4 is connected to the cathode of the LED indicator 33, and the anode of the indicator 33 is 1/2 VDD Zener. A cathode of the zener diode 34 is connected to the other end of the pushbutton 32, one end of the electronic buzzer 35 and the connection terminal VDD of the device 10, and the other end of the electronic buzzer 35 is connected to the device 10. Connected to terminal 8, the connection point between pushbutton 32 and indicator light 33 is connected to connection terminal 6 of device 10, the connection point between resistors 331 and 240 is connected to the cathode of 3/5 VDD zener diode 332, The anode of the diode 332 is connected to one end of the protective resistor 333, the other end of the resistor 333 is connected to the base of the NPN switching transistor 334, the emitter of the transistor 334 is a direct current One end of a resistor 335 for supplying a positive voltage (VDD) of a direct current voltage is connected to an anode (VDD) of a direct current voltage, and the other end of the resistor 335 is coupled to an input of an inverter 336. And an output of the inverter 336 is coupled to an AND gate 452 of the selection control circuit 450 and a second input of 453 to form an extension telephone operation circuit 330.

When the main phone 20 is in the normal state, the potential of the VDD is pushed through the pushbutton 32 and the terminal 6 through the voltage drop resistor 331 via the pushbutton 32 to operate the pushbutton 32 of the extension phone 30. The voltage drop and protective resistor 240 is applied to the collector of the NPN switching transistor 239 and brakes 3/5 VDD Zener diode 332. The potential of 2/5 VDD above the down voltage exerts a high level on the base of the NPN switching transistor 334 through the protective resistor 333, whereby the transistor 334 is " on " through the emitter collector of the transistor 334. An extension telephone is provided with a negative electrode provided at the input of the inverter 336, and an operation signal of logic 1 at the output of the inverter 336 is provided at the AND gate 452 of the selection control circuit 450 and the second input of the 453. 20 is called and the control circuit provided with the selection signal is set.

The controller 400 includes the mutual call control circuit 410, the pulse generator 430, and the switch call control circuit 440. The part shown by the dotted line 450 is a selection control circuit diagram, and the output of the AND gate 451 which combines the output of the inverter 235 of the main telephone display circuit 230 and the output of the inverter 316 of the main telephone operating circuit 310 is the second input of the OR gate 455. And an AND gate 452 coupled to a first input of an OR gate 459 and a first input of a NAND gate 457 to which an output of the inverter 215 of the extension telephone display circuit 210 and an output of the inverter 336 of the extension telephone operation circuit 330 are coupled. The output is coupled to the second input of the OR gates 456 and 459 and the first input of the NAND gate 458, and the output of the inverter 211 of the expansion telephone display circuit 210 and the output of the inverter 336 of the expansion telephone operation circuit 330 are combined. The output of the gate 453 is coupled to the first input of the OR gates 456 and 464, and the output of the inverter 231 of the main phone display circuit 230 and the output of the inverter 316 of the main phone operation circuit 310 are determined. The sum of the outputs of AND gate 454 is coupled to the first input of OR gate 455 and the second input of OR gate 464, and the output of OR gate 464 is coupled to the first input of AND gate 465 and AND gate 465. The second input of the D flip of the call control circuit 410. The output of AND gate 465 is coupled to the Q output of flop 411 and the D flip of the switching call control circuit 440. Coupled to the S input of flop 411, the output of OR gate 459 is the D flip of call control circuit 410. Coupled to the S input of the flop 411, the output of the OR gate 455 is connected to one end of the 400mS time constant resistor 531 of the FIG. 4 caller 500, and the output of the OR gate 456 is 400mS correct of the caller 500 of FIG. Connected to one end of the receiving resistor 521, the output of the NAND gate 461 is coupled to the second input of the NAND gates 458 and 460 and to the resistor 195 of FIG. 2, and the output of the NAND gate 463 is connected to the NAND gates 457 and 462 Coupled to resistor 197 of FIG. 2, the output of NAND gate 457 is coupled to a first input of NAND gate 460, and the output of NAND gate 460 is a first input of NAND gate 461; And a second input of NAND gates 461 and 463 coupled to the output of NAND gate 422 of reciprocal control circuit 410, coupled to the resistor 191 of FIG. And the output of the NAND gate 458 is coupled to the first input of the NAND gate 462, the output of the NAND gate 462 is coupled to the first input of the NAND gate 463, and the output of the switching control circuit 440. RS flipped by NAND connected to one end of 10mS time constant resistor 447 and resistor 193 in FIG. The flop circuit B is configured to constitute the selection control circuit 450.

If the main telephone 20 operates the pushbutton 22 in the normal state, the main telephone .... … By providing an operation signal to the second input of the AND gate 451 provided with the selection signal by the magnetic button operating circuit, information of logic 1 is output from the output of the AND gate 451 to the second input of the OR gate 455 and the first of the OR gate 459. D flip of the talk control circuit 410 through the input. The D flip is provided to the S input of the flop 411. Flop. An R-S flip composed of NAND gates 460 and 461 by the logic 0 output of NAND gate 457 by setting 411 and providing logic 1 information to the first input of NAND gate 457 provided with the logic 1 output of NAND gate 463. By setting the flop circuit A, the control signal of logic 1 at the output of the NAND gate 460 and the logic 0 at the output of the NAND gate 461 are provided to the power switch 190 of the connection section 100. … The line detector 170 is inserted in series into the power supply circuit and logic 0 is provided to the second input of the NAND gate 458 to render the NAND gate 458 inoperable.

If the extension telephone 30 operates the pushbutton 32 in the normal state, the extension telephone… … By providing an operation signal to the second input of the AND gate 452 provided with the selection signal by the operation button operating circuit, the OR1 gate 456 receives the second input and the OR gate 459 second input from the output of the AND gate 452. D flip of the talk control circuit 410 through the input. The D flip is provided to the S input of the flop 411. The flop 411 is set, and the logic 1 information is provided to the first input of the NAND gate 458 where the logic 1 output of the NAND gate 461 is provided, so that the logic 0 output of the NAND gate 458 constitutes the NAND gates 462 and 463. RS flip. The flop circuit B is set to provide a control signal at logic 1 at the output of the NAND gate 462 and at the logic 0 at the output of the NAND gate 463 to the power supply switch 190 of the connection section 100 to expand the telephone set. … The line detector 170 is inserted into the supply circuit, and a logic 0 is provided to the second input of the NAND gate 457 to render the NAND gate 457 inoperable and the AND gate through the 10 mS geothermal circuit of the switching call control circuit 440. A circuit is provided for resetting the switched call control circuit 440 when providing the logic 1 to the first input of the 446 to connect the trunk line to the main phone 20 side during a call with the trunk line from the extension telephone 30 side.

The R-S flip. The flop circuits A and B are reset by a reset pulse generated at the output of the NAND gate 422 of the call control circuit 410 when the call control circuit 410 is reset.

If the telephone 20 operates the pushbutton 22 while the telephone is busy, the main telephone… … Since the operation signal is provided to the second input of the AND gate 454 provided with the selection signal by the operation button operating circuit, information of logic 1 is output from the output of the AND gate 454 to the first input of the OR gate 455 and the second of the OR gate 464. A first input of an AND gate 465 through an input, wherein the second input of the AND gate 465 is a D flip of the call control circuit 410. Flop 411

Coupled to an output to control a set input of a switchover call control circuit 440; When the logic 1 is output from the Q of the flop 411, the information of the logic 1 is output from the output of the AND gate 465 to the D flip of the switching call control circuit 440. The D flip is provided to the S input of the flop 411. Set flop 411.

If push button 32 is activated while extension phone 30 is in a call, extension phone… … By controlling the operation signal to the second input of the AND gate 453 provided with the selection signal by the operation button operating circuit, the logic 1 information is output from the output of the AND gate 453 and the first input of the OR gate 456 and the first of the OR gate 464. A first flip of the AND gate 465 via an input, wherein the second input of the AND gate 465 has a D flip of the call control circuit 410. Logic 1 is controlled at the output of flop 411 Q, so D flips to the logic 1 output of AND gate 465. Set flop 411. The OR gate 455 senses information of logic 1 controlled at the outputs of AND gates 451 and 454 and outputs the logic 1 information to the caller 500 to operate the electronic buzzer 35 of the extension telephone 30.

When the OR gate 456 senses the information of logic 1 controlled at the outputs of the AND gates 452 and 453, the OR gate 456 outputs the logic 20 information to the caller 500 to operate the electronic buzzer 25 of the main telephone 20.

The part shown by the dotted line 410 is a mutual call control circuit diagram, D flip. The Q output of the flop 411 is coupled to the first input of the NAND gate 415, and the second output is coupled to the operating circuit inputs of the relays 110 and 120 of the junction 100 and the Q output is the D input and the first input of the OR gate 421. And the second input of the AND gate 465 of the selection control circuit 450, connected to one end of the 4 second time constant resistor 412, the other end of the resistor 412 to one end of the protective resistor 414, and The other end is coupled to the second input of the NAND gate 415, and the connection term between the resistors 412 and 414 is connected to one end of the 4-second time constant capacitor 413, and the other end of the capacitor 413 is connected to the negative pole of the DC voltage to correct the CR correction. A 4-second delay circuit by numbers constitutes a logic differential circuit by NAND, the output of NAND gate 415 is coupled to the first input of NAND gate 416, and the second input of NAND gate 416 is the line of the second diagram connection 100. Detector 170 The output of NAND gate 416 is connected to one end of 300mS time constant resistor 417, and to the anode of diode 710 of signal control section 700 of FIG. 4, and the other end of resistor 417 is connected to one of protective resistor 419. The other end of resistor 419 is connected to the input of inverter 420, the connection point between resistor 417 and 419 is connected to one end of a 300mS time constant capacitor 418, and the other end of capacitor 418 is connected to the negative pole of the DC voltage. The output of inverter 420 is coupled to the second input of OR gate 421 and the first input of NAND gate 422 and the input of inverter 423, and the output of inverter 423 is 1mS corrected. One end of the receiving resistor 424, the other end of the resistor 424 is connected to one end of the protective resistor 426, and the other end of the resistor 426 is connected to the NAND gate 422 It is coupled to two inputs, and the connection point between the resistors 424 and 426 is connected to one end of the 1mS time constant capacitor 425, and the other end of the capacitor 425 is connected to the negative pole of the DC voltage and connected to the NAND by a 1mS delay circuit by the CR time constant. Logic division, the output of the OR gate 421 is coupled to the C input of the D flip-flop 411, and the output of the NAND gate 422 is the NAND gate 461 of the selection control circuit 450 and the second input switching call control circuit 440 of the 463. Is coupled to an input of an inverter 445 to form a call control circuit 410.

When the logic 1 information is provided to the S input of the D flip flop 411 at the output of the OR gate 459 of the selection control circuit 450, the D flip flop 411 is set so that the mutual call control signal of the logic 1 at the Q output is shown in FIG. 4 seconds at the output of the NAND gate 415 by the logic differential circuit by the NAND, provided to the operating circuits of the relays 110 and 120 of the connection part 100 to maintain the operation of the relays 110 and 120 and to the first input of the NAND gate 416. Outputs a logic 0 to the first input of the NAND gate 416, inputs a logic 0 to the data input D at the Q output, provides it to the first input of the OR gate 421, and provides a 4 second delay circuit with a CR time constant. 4 seconds later, the logic 1 is output from the output of the NAND gate 416, and is provided to the second input of the AND gate 465 of the selection control circuit 450 to block the set input circuit of the switching call control circuit 440 while the mutual call control signal is output. , NAND When logic 0 is detected at the first input of the gate 416, the logic 1 output of the NAND gate 416 is applied to the anode of the diode 710 of the signal control unit 700, and is provided to the first input of the AND gate 705 as an OR coupling circuit by the diode. It is possible to receive 20Hz interruption signal from the CO line during mutual call, and after 300mS through 300mS delay circuit by CR time constant, the second input of OR gate 421 and the first input of NAND gate 422 and inverter through inverter 420 The logic 0 output of the OR gate 421 is provided as the counter input of the D flip-flop 411 because the logic 0 is provided to the input of the 423, and the logic 0 output of the Q output of the D flip-flop 411 is provided at the first input of the OR gate 421. The control signal of the logic 0 output of the line detector 170 of the second-degree connection 100 is stored within 4 seconds of supplying the data of logic 0 inputted to C and inputted by D, and the D flip-flop 411 set. Second mouth of Even if the control signal is received at 300mS and the control signal within 300mS is received, the set state of the D-flop 411 is maintained as described above, and when the call is terminated and the handset of the calling telephone is put in place, the logic of the line detector 170 is maintained. The control signal is detected at the NAND gate 416, and the logic of the logic 1 at the output of the inverter 420 is provided to the C input of the D flip-flop 411 through the second input of the OR gate 421 after 300mS through the 300mS delay circuit. As a result, 0 data is output from the Q output, and the result is reset. Also, a logic differential reset circuit generates a reset pulse of logic 0 for 1 mS at the output of the NAND gate 422 for the RS flip-flop of the selection control circuit 450. Circuits A and B and the switching call control circuit 440 is provided at the input of the inverter 445.

The dotted line 440 is a switching call control circuit diagram. The Q output of the D flip-flop 411, which is coupled to the output of the AND gate 465 of the selection control circuit 450, is connected to the input of the inverter 431 of the pulse generator 430 and the second diagram connection part 100. AND gate 443 coupled to the input of the operating circuit of relay 130, Q output of D flip-flop 411 is coupled to D input and the first input of OR gate 442, and to which resistors 222 and 243 of display unit 200 are connected. The output of is coupled to the first input of OR gate 444, where the second input of OR gate 444 is coupled to the output of AND gate 446, and the second input of AND gate 446 is the output of NAND gate 422 of call control circuit 410. Coupled to the output of inverter 445, coupled to the first input of AND gate 446, connected to one end of protective resistor 449, the other end of resistor 449 to the other end of 10 mS time constant resistor 447, One end of resistor 447 is coupled to the output of NAND gate 462 of the selector control circuit 450. The connection point between resistors 447 and 449 is connected to one end of a 10mS time constant capacitor 448, and the other end of capacitor 448 It is connected to the negative pole of the to form a 10mS delay circuit by the CR time constant, the output of the OR gate 444 is coupled to the second input of the OR gate 442, the output of the OR gate 442 is connected to the C input of the D flip-flop 441 Are combined to form a switchover call control circuit 440. At the output of AND gate 443 where the logic 0 control signal is provided through the two-second delay circuit of the main converter display circuit 230 or the expansion converter display circuit 210, the logic 0 information is passed through the first input of the OR gate 444 and the OR gate. When the logic 1 signal is applied to the S input of the D flip flop 441 at the output of the AND gate 465 of the selection control circuit 450 in the state provided to the second input of 442, the D flip flop 331 is set, and the Q output The switching call control signal of logic 1 is supplied to the input of the inverter 431 of the pulse generator 430 to operate the pulse generator 430, and is provided to the operation circuit of the relay 130 of the connection part 100 of FIG. In the output, logic 0 is provided to the data input D and the first input of the OR gate 442, and the logic 0 output of the OR gate 442 is input to the counter input C of the D flip-flop 441, and the data of logic 0 input to the data input D is input. To By holding D flip flop 441 in the set state and setting the call control circuit 410 on the extension telephone 30 side, the logic 1 information of the NAND gate 462 of the RS flip-flop circuit B of the selection control circuit 450 is ORed. At the output of the NAND gate 422 of the intercommunication control circuit 410 after 300 mS with the handset of the telephone 31 of the extension telephone 30 in place while being provided to the first input of the AND gate 446 via a 10 mS delay circuit by the time constant. Inverter 445 senses the reset pulse of logic 0 output for 1 mS and provides logic 1 to the second input of AND gate 446 to provide logic 1 at the output of AND gate 446 to the second input of OR gate 444, or After two seconds of putting the handset of the telephone in communication on, the logic 1 output of the OR gate 444 is inputted to the second input of the OR gate 442 if the logic 1 information is provided to the first input of the OR gate 444 at the output of the AND gate 443. A through D are provided to the flip-flop 441 of the counter input C must be consequently switched call control circuit 440 sets the re sikimyeo outputs a logic 0 at the Q output of memory data.

The dotted line 430 is a circuit diagram of the pulse generator. The output of the inverter 431, which is coupled to the Q output of the switching call control circuit 440, is coupled to the input of the inverter 432, and is connected to one end of the 60IPM time constant resistor 436. The output of the inverter 432 is coupled to the input of the inverter 433, and is connected to one end of the 60 IPM time constant capacitor 435. The output of the inverter 433 is coupled to the second input of the AND gates 216 and 236 of the display unit 200. The input of is connected to one end of the protective resistor 434, the other end of the resistor 434 is connected to the other end of the resistor 436 and the other end of the capacitor 435 to form an unstable far vibrator circuit to form a pulse generator 430 .

When the switching call control signal of logic 1 at the Q output of the switching call control circuit 440 is provided to the input of the inverter 431, an unstable multivibrator circuit generates a pulse of 60 IPM at the output of the inverter 433 and outputs the AND gates 216 and 236 of the display unit 200. It outputs to a 2nd input, and outputs logic 1 normally.

4 is a detailed circuit diagram of the caller 500, the signal receiver 600, the signal controller 700, the main telephone 20, and the extension telephone 30. As shown in FIG. The part shown by the dotted line 600 is a circuit diagram of the signal receiver, and one end of the voltage drop resistor 601 is connected to the connection terminal L1 of the device 10 to be connected to one side of the trunk line, and the other end of the resistor 601 is used for blocking the DC. One end of the capacitor 602, the other end of the capacitor 602 is connected to both sides of the half-wave rectifying diode 603, and the cathode of the diode 603 is connected to one end of the resistor 604 for supplying a cathode of DC voltage, The negative pole of the DC voltage is connected to the other end of the resistor 604 and the positive pole of the half-wave rectifier diode 605, the negative pole of the diode 605 is connected to one end of the DC blocking capacitor 606, and the other end of the capacitor 606 for voltage drop. Connected to one end of resistor 607, the other end of resistor 607 to the terminal L2 of device 10 to be connected to the other side of the trunk line, diode 6 The connection point between the 03 and the resistor 604 is coupled to the second input of the AND gate 705 of the signal controller 700 and the second input of the OR gate 237 of the telephone display circuit 230 of FIG. 3 to form the signal receiver 600.

Logic 0 information is provided to the second input of the AND gate 705 of the signal controller 700 and the second input of the OR gate 237 of the present electronic display circuit 230 through the negative terminal 604 of the DC voltage low. The interruption signal is connected to the terminal L1. … Resistor 601... … Capacitor 602... … Diode 603... … Resistor 604... … Diode 605... … Capacitor 606... … Resistor 667... … The half-wave rectified 20 Hz intermittent pulse received at the connection terminal L2 of the device 10 is connected to the second input of the AND gate 705 of the signal controller 700 and the OR gate 237 of the present invention telephone display circuit 230 at the connection point between the diode 603 and the resistor 604. Provided to the second input.

The signal receiving unit 600 has a capacitance between the connection terminal L1 and the connection terminal L2 of 0.01 microfarad or less, the impedance for AC 20 Hz and 300 Hz is 100 kilohm or more, and the connection point between the connection terminal L1 and the output (diode 603 and resistor 604). ) And the connection terminal L2 and the output point are separated by direct current by electrostatic coupling.

The part shown by the reference line 700 is an arc diagram of the signal control unit. The first input of the AND gate 701 is coupled to the output of the inverter 235 of the telephone display circuit 230 of the present invention, and the second input of the AND gate 701 is shown in FIG. 3 is connected to the output of the inverter 215 of the extension telephone display circuit 210, the output of the AND gate 701 is connected to one end of the 300mS time constant resistor 702, the other end of the resistor 702 is connected to one end of the protective resistor 704 And the other end of resistor 704 is coupled to the first input of AND gate 705, and the connection point between resistors 702 and 704 is coupled to the output of NAND gate 416 of the third degree call control circuit 410. And one end of the 300mS time constant capacitor 703, the other end of the capacitor 703 is connected to the negative pole of the DC voltage to form a 300mS delay circuit by the CR time constant, and the OR connection by the diode 710 Configured in the circuit, the output of AND gate 705 is connected to the anode of diode 706 and one end of 200mS time constant resistor 707, the other end of resistor 707 is connected to one end of protective resistor 709, and the other end of resistor 709 Is connected to the first input of the OR gate 534 of the caller 500, and the connection point between the resistors 707 and 709 is connected to the cathode of the diode 706 and one end of the 200mS time constant capacitor 708, and the other end of the capacitor 708 200mS delay circuit is connected to the cathode of the signal control unit 700 is configured.

When the main phone 20 and the extension phone 30 are in a normal state, the logic 1 information is provided to the two inputs of the AND gate 701 through the 100 mS delay circuit of the third-degree display section 200 and the 300 mS delay circuit is output from the output of the AND gate 701. Logic 1 information or logic 1 information of the OR combining circuit by the diode through the diode 710 at the output of the NAND gate 416 of the inter talk control circuit 410 is provided to the first input of the AND gate 705 during the mutual call. When a 20 Hz intermittent pulse half-wave rectified at the output of the signal receiver 600 is applied to the second input of the AND gate 750, a 200 mS delay circuit (for example, a 20 Hz pulse is applied for 1 second and stopped for 2 seconds at the output of the AND gate 705) Circuit for outputting logic 1 for 1,2 seconds and output logic 0 for 1,8 seconds) to convert the 20 Hz intermittent pulse into an interrupted signal, which is provided to the first input of the OR gate 534 of the calling unit 500. When 20 or extension telephone 30 transmits a dial impulse while talking on a CO line or when a CO line is interrupted for a short time within 400mS, a pulse caused by the voltage maintained between the connecting terminals L1 and L2 is transmitted to the AND gate 705 through the signal receiver 600. As described above, logic 0 is continuously provided to the first input of the AND gate 705 for 100 mS delay circuit of the display unit 200 and 400 mS from the output of the AND gate 701 to the 300 mS delay circuit as described above. You will not be able to.

The part shown by dashed line 500 is the circuit diagram of the calling part, and the other end of the 400mS time constant resistor 531 connected to the output of the OR gate 455 of the selection control circuit 450 is connected to one end of the protective resistor 533. At the other end of the 533, the second input of the OR gate 534 is combined, the first input of the OR gate 534 is connected to the resistor 709 of the signal controller 700, and the salt defect between the resistors 531 and 533 is one of the capacitors of the 400 mS time constant capacitor 532. The other end of the capacitor 532 is connected to the negative pole of direct current voltage to form a 400mS delay circuit by CR time constant, the output of the OR gate 534 is connected to one end of the resistor 535, and the resistor 535 is different One end is connected to the base of the NPN switching transistor 536, the emitter of the transistor 536 is connected to the cathode of the DC voltage, the collector of the transistor 536 is before expansion The electronic buzzer 35 of the firearm 30 is connected to the connection terminal 8 of the device 10 to be connected. … The information of logic 1 provided at the output of the OR gate 455 of the selection control circuit 450 is provided to the second input of the OR gate 534 through the 400 mS delay circuit, or at the output of the signal controller 700 by the operation signal by the operation button operation circuit. When an intermittent signal of logic 1 is provided to the first input of the OR gate 534, the high level of logic 1 at the output of the OR gate 534 is applied to the base of the NPN switching transistor 536, so that the transistor 536 is "on" and the direct current voltage Is applied to the electronic buzzer 35 of the expansion telephone 30 through the connecting terminal 8, and the electronic buzzer 35 is operated. … The call signal circuit is constructed.

The other end of the 400mS time constant resistor 521 connected to the output of the OR gate 456 of the selection control circuit 450 is connected to one end of the protective resistor 523, and the other end of the resistor 523 is connected to the input of the OR gate 524. The connection point between resistors 521 and 523 is connected to one end of a 400mS time constant capacitor 522, the other end of the capacitor 522 is connected to a negative pole of direct current voltage to form a 400mS delay circuit by CR time constant, and OR gate The output of 524 is connected to one end of a resistor 525, the other end of the resistor 525 is connected to the base of the NPN switching transistor 526, the emitter of the transistor 526 is connected to the negative pole of a direct current voltage, The collector is connected to the terminal 7 of the device 10 to which the phone 25 of the main phone 20 is to be connected. Wa ... … The logic 1 information provided at the output of the OR gate 456 of the selection control circuit 450 by the operation button operation circuit is passed through the 400mS delay circuit and the high level of logic 1 is passed through the OR gate 524 of the NPN switching transistor 526. The main telephone is applied to the base, and the transistor 526 is "on", and a negative pole of a direct current voltage is applied to the electronic buzzer 25 of the main telephone 20 through the terminal 526, and the electronic buzzer 25 operates. … The call signal circuit is constructed.

C.O.line from 30 telephones … If you want to make trunk line call by extension telephone connection circuit, push button 32 is momentary operation (within 400mS), so electronic buzzer 25 of main phone 20 cannot be operated, and switching control signal is provided as contact part 100 to make desired trunk line call. Will be done.

Telephones 21 and 31 are automatic telephones for public use, indicators 23 and 33 are light-emitting diodes that are ignited by a small current, and electronic buzzers 25 and 35 are solid-state pronunciations. And small in weight, more than 75 decibels at 0.5 meter distance from the electronic buzzer, the driving current is 10 mA or less, and high impedance, so that the distance between the device 10 and the telephone is 4Km.

As described above, the present invention is connected in series with a known common automatic telephone (21, 31), a push button (22, 32) for transmitting an operation signal and a zener diode for receiving a display signal and displaying the state of the other telephone. 20 telephones, telephones, extension telephones, telephones, etc., including telephones 25 and 35, which are over-called by the indicators 23 and 33. … The trunk line and the telephone 21 are connected by the main telephone connection circuit. … When the telephone 31 is connected to the power supply circuit, and the call control signal is provided from the control unit 400, the main telephone unit is connected to the telephone line. … Power supply circuit and extension telephone… … An interconnection connection circuit between the telephone 21 and the telephone 31 is configured by the power supply circuit, and the line detector 170 is inserted in series with the source power supply circuit according to the signal provided from the selection control circuit 450, and the switching call control signal is provided. When the C.O. … The telephone 31 is connected to the trunk line by the extension telephone connection circuit. … Power supply circuit and extension telephone… … A telephone communication circuit between the telephone 21 and the telephone 31 is constituted by the power supply circuit, and the queuing of the trunk line is transmitted by the standby tone ring connection circuit, and the melody / standby sound is transmitted to the trunk line, and the line detectors 150 and 160 display the status signal. And a connection part 100 for outputting a control signal from the line detector 170 to the mutual call control circuit 410 of the control part 400, and receiving a status signal provided from the connection part 100 to display a display signal by the status display circuit. A display unit 200 which is provided to the indicators 23 and 33, provides a selection signal and a control signal to the control unit 400, and provides a selection signal to the signal control unit 700, and an operation transmitted from the push buttons 22 and 32 of each telephone. Calling unit 2 by the selection signal provided from the control unit 300 for providing the operation signal to the control unit 400 and the operation signal provided from the control unit 200 by the signal. Providing information to 00, providing a call control signal or a switching call control signal and a signal for controlling the insertion of the line detector 300 into the power supply circuit to the connecting portion 709, and making a mutual call by the line detector 170 control signal of the connecting portion 100. It controls the control signal, provides the information of logic 1 to the signal control unit 700 during the mutual call to receive the 20 Hz intermittent signal, controls the switching call control signal by the control signal provided by the display unit 200, and the pulse generator 430 A control unit 400 for outputting 60 IPM pulses to the display unit 200, a signal receiver 600 for providing a half-wave rectified 20 Hz intermittent pulse from the trunk line to the display unit 200 and the signal controller 700, and a selection signal provided from the display unit 200; The control unit 400 controls the 20 Hz intermittent pulse provided by the signal receiving unit 600 according to the information provided during the mutual call, and 2 Signaling unit 700 and the control unit for providing the interrupted signal to the caller 500 by converting the interrupted signal to the 0Hz interrupted pulse and the caller that receives the information provided by the control unit 400 and the interrupted signal provided by the signal controller 700 and provides the call signal to the corresponding telephone. When the trunk line is connected to a single device 10 consisting of 500, and the main telephone 20 and the extension telephone 30 are connected in 5 wires and used as a shared telephone or extension telephone, each telephone (21, 31) and a push button at each telephone position. By operating (22, 32), you can freely call and make calls between the telephones 21 and 31 between the telephones you want, without the help of others, and make outgoing calls from the trunk lines, incoming calls from the trunk lines, and answer the trunk lines during the trunk lines and calls. Provides melody sound to CO line by looping and double-clicking CO line during waiting time by switching call connection and standby tone connection circuit In addition, the status of the other party's phone is displayed, and the phone is restored to its original position after the call is put back in place. Therefore, the common phone or artificial extension phone which is operated artificially on the main phone side is connected to the conventional main phone side. It eliminates the inconveniences and shortcomings of the battery, and uses a photocoupler, an IC, a relay, a transistor, a light emitting diode, an electronic buzzer, and other electronic devices.

Claims (1)

As described in the text and shown in the drawings, push buttons 22 and 32 and display signals for transmitting operation signals with known automatic telephones 21 and 31 are used in order for two telephones to be shared by two telephone lines. Main telephone 20 including an indicator light 23 and 33 connected in series to a zener diode which displays the state of the other party by receiving a signal and an electronic buzzer 25 and 35 which is operated by receiving a call signal; Generates a state signal indicating the state of the telephone 30 and the telephones 21 and 31, provides a display signal to each telephone side, and operates in response to a signal transmitted from the main telephone 20 or the extension telephone 30. Generates a signal to provide a call signal to the state telephone side, and generates a switched call control circuit or mutual call control signal selected by the selection signal to generate a call between the trunk line and each of the telephones 21 and 31 or the telephone 21 by the operation of the related relay. 31) Award In the device consisting of a device 10 for connecting the connection between the line detectors 150 and 160, the indicators 23 and 33, the push buttons 22 and 32, and the display units 210 and 230 connected to the operation units 310 and 330. Coupling the control unit 400 with the control unit 310, 330, the signal receiving unit 600 connected to the trunk line is coupled to the OR gate 237 of the display unit and the AND gate 705 of the signal control unit coupled to the control unit, the electronic buzzer ( The call unit 500 connected to the 25 and 35 is coupled to the OR gates 455 and 456 and the signal control unit 700 of the controller, and the control unit 400 connects the connection line 100 connected to the trunk line, the telephone 21, and the telephone 31. ) Is connected to the telephone 21 and the telephone 31 before each other, the outgoing incoming call connection between each of the telephone (21, 31) and the trunk line, and the diverted call connection to the other phone side during the trunk line Telephone equipment.

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