JPS59161959A - Method and device for recovery of telephone terminal device - Google Patents

Abstract

PURPOSE:To transfer a call with no disturbance even if a connection is made in reversing in polarity of an originating telephone by inverting in polarity of the originating telephone circuit to produce a connection signal after the handset of a telephone of the remote side is picked up for answer. CONSTITUTION:When a see-hold relay 17 is closed with inverted polarity of a circuit, a photocoupler 32 is turned on and a DFF34 is reset. Then a negative output emerges at a positive inverse output 38, and a positive output emerges at an output 37. This state is stored in a main control part 27. When the handset of a telephone of the remote side is picked up, the polarity of a terminal 18 is inverted. Thus the coupler 32 is turned off to release a reset state of the DFF34. When a trigger pulse is applied to T of the DFF34, the positive and negative outputs emerge at output terminals 38 and 37 respectively. These outputs are compared with the output stored in the part 27 to decide the answer of the telephone of the remote side.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention particularly relates to a method and apparatus for restoring telephone terminal equipment used in transfer devices.

As shown in FIG. 4, a general telephone has a relay coil a and a relay contact switched by the relay coil a in a called telephone circuit in a telephone office. A has a structure that operates only when current flows in the direction of arrow A, and does not allow current to flow in the opposite direction of arrow A (those skilled in the art call this a polar relay). Two-tree telephone lines had a positive line on one side and a negative line on the other, and if they were connected incorrectly, the forwarding machine would not work. Therefore, due to construction work inside the telephone office (including work on outside lines from the telephone office to the subscriber), the positive and negative polarity may be reversed, and if this happens, the connection that was previously connected without any failure may become disconnected. However, it suddenly broke down, which was extremely inconvenient.

The present invention adds a simple device to a conventionally known transfer device, thereby making it possible to transfer data without failure even if the positive and negative connections are reversed as described above.

According to the present invention, when an incoming telephone line is called from a calling telephone, a transfer destination telephone is called by the originating telephone line via a transfer device, and the calling telephone and the transfer destination telephone are directly connected. In the method that enables calls, when you pick up the handset of the transfer destination phone and answer it, the polarity of the calling phone line is reversed to negative and positive if it is normal polarity, that is, positive or negative, and it becomes a connection signal, and the normal polarity is changed. If not, that is, if the polarity of the calling telephone line is negative or negative, the telephone terminal equipment recovery method reverses the polarity of the calling telephone line to positive or negative and restores it as a connection signal. In a device in which the transfer destination telephone is called by the calling telephone line, and the calling telephone and the transfer destination telephone are connected so that a direct call can be made, when the handset of the transfer destination telephone is picked up and answered. 1 The polarity of the outgoing telephone line is reversed and becomes a connection signal, and when the polarity is restored, a circuit is installed that uses this as a device recovery signal, regardless of the polarity of the outgoing line. The gist of the present invention is the configuration of a telephone terminal equipment recovery device that operates equipment.

Before explaining the gist, let us explain what kind of device is the transfer device in the present invention.
Flash corresponds to this, ■ is the calling telephone, 2 is the calling telephone, 3 is the controlling telephone station, 4 is the receiving telephone, 5 is the transfer machine, 6 is the originating telephone, 7 is the destination telephone station, 8 is a transfer destination telephone, and the central telephone office 3 has jurisdiction over the incoming telephone 4 and the outgoing telephone 6. FIG. 2 is a block diagram of the configuration of the transfer device 5, where 9 is a terminal connected to the incoming telephone 4, 10 is a bell detection section of the incoming telephone 4, 11 is a be-hold relay for the incoming line, and 12 is an incoming call. a voice coupling transformer of the telephone 4; 13 a line recovery detection unit for the incoming telephone line; 14 a bidirectional amplifier;
5 is a link relay between the incoming telephone 4 and the outgoing telephone 6, 16
17 is a seahold relay for the 6 lines of the originating telephone 6; 18 is a signal terminal connected to the 6 lines of the originating telephone; 19 is a line polarity detector for the 6 lines of the originating telephone; 20 is a control unit of the behold relay 11;
21 is a master reset control section of the transfer device 5, 22 is a control section of the link relay 15, 23 is a reset timer of the transfer 4115, 24 is an external reset input terminal, 25 is a pull amplifier resistor for resetting the external reset input terminal 24, and 26 is a reset pull amplifier resistor of the external reset input terminal 24. A sea relay control section of the sea hold relay 17, 27 a main control section of the transfer device 5, 28 a master clock of the transfer device 5, and 29 an auto dial control section of the transfer device 5.

The transfer device shown in FIGS. 1 and 2 is such that when a calling telephone station 1 calls a calling telephone station 2, a call telephone station 3 sends a call to a receiving telephone station 4.
When a call is received, the bell detection section 10 detects this, and the main control section 27 operates the sea relay control section 26, the auto dial control section 29, and the voice coupling transformer 1.
6 and Seahold relay 17 are connected to place a call to the central telephone office 3. As a result, a call is placed from the calling telephone 1 to the forwarding destination telephone 8, and the handset of the forwarding destination telephone 8 is picked up. As a result, a polarity reversal occurs at the line terminal 18, which is detected by the line polarity detector 19 and output to the main controller 27. As a result, the control unit 20 is activated to connect the be-hold relay 11, and the generation of the message tone is controlled by the message tone control unit 30 and the auto-dial control unit 29 for a certain period of time. After that, the main control unit 27
A control signal is applied to the control unit 22, connects the link relay 15, applies an operation command to the bidirectional amplifier 14, and makes a call.
The telephone device 1 and the transfer destination telephone device 8 are now in a conversation state.

The present invention provides line polarity detection section 1 of the apparatus shown in FIG.
In the figure, 31 is a current limiting resistor, 32 is a photocoupler, 33 is a pull-up resistor, 34 is a D clip-flop, 35 is an OR gate, 36 is an AND gate, and 37 is negative inversion output 37
．． 38 is a positive inversion output, 39 is a clock pulse generator, 4
0 is a 3 second timer, 41 is a BCD counter, 42 is a decimal counter, 43 is an OR gate, and 44 is a tire monitor circuit.

For example, when the line in the telephone office is reversed in polarity, the upper part of the terminal 18 becomes positive and the lower part becomes negative. Then, Seahold Relay 17
When closed, current is shunted to the current limiting resistor 31 and the diode side of the photocoupler 32, and after preventing overcurrent of the photocoupler 32, the current flows to the negative terminal of the shield terminal 18. Then, the light-receiving side transistor of the photocoupler 32 turns on, and the R of the D flip-flop 34 turns on.
A reset is applied to the terminal. In this state, the decimal counter 42 in the main control unit 27 applies a trigger to the T terminal of the D flip-flop 34 at the intermediate tone when sending out the FB), but since it is already in the reset state, its output Q and Q remains unchanged, a negative output appears at the positive inversion output 3B, and a positive output appears at the negative inversion output 37. This is stored in the main control section 27. Next, by lifting the transfer destination telephone 8, a polarity reversal phenomenon occurs, and the upper terminal of the terminal 18 becomes negative and the lower terminal becomes positive. As a result, the current flowing through the diode of the photocoupler 32 is cut off, and the current flows only through the current limiting resistor 31. Therefore, the light-receiving transistor in the photocuff', y-32 is turned off, and when a tri-force pulse is applied to the D-flimb flop 34 at the timing when the R terminal of the D-clip flop 34 is released, the output terminals Q and Q are respectively turned off. The positive inverted output 38 has a positive output,
A negative output appears at the negative inversion output 37. By comparing this with the output stored in the main control section 27, it is determined that the forwarding destination telephone 8 has responded. As a result, a conversation between the calling telephone 1 and the transfer destination telephone 8 becomes possible.

As already mentioned, a general telephone has a relay coil and a relay contact switched by the relay coil in the called telephone circuit in the central office, and the relay coil is a polar relay. Therefore, one of the two telephone lines was positive and the other was negative, and if they were connected incorrectly, the transmitter would not work. However,
Since the line of the called device runs through the telephone office, the positive and negative lines may be reversed and connected due to construction work within the telephone office (including construction work on external lines from the telephone office to the subscriber). If that happens.

Things that had previously been connected without failure suddenly started to fail, which was extremely inconvenient.

However, in the present invention, when the calling telephone set 1 calls the incoming telephone line, the forwarding telephone set 8 is called by the calling telephone line via the transfer device 5, and the calling telephone set 1 and the forwarding telephone set 8 are connected to each other. In this method, when you pick up the handset of the transfer destination telephone 8 and answer "I", the polarity of the calling telephone line changes to negative/positive if the normal polarity is positive/negative. A method for restoring telephone terminal equipment in which the polarity of the telephone line is inverted to positive and negative and the connection signal is restored as a connection signal, and if the polarity is not the normal polarity, that is, it is negative or positive, the telephone terminal device is restored as a connection signal, and the telephone terminal device 1 When the incoming telephone line is called, the forwarding telephone 8 is called by the outgoing telephone line via the transfer device 5, and the l1IJ telephone 1 and the forwarding telephone 8 are connected to make a direct call. When the handset of the transfer destination telephone 8 is picked up and answered, the polarity of the calling telephone line is reversed and becomes a connection signal, and when the polarity is restored, this is used as a device recovery signal. Since the gist of the present invention is a configuration of a telephone terminal equipment restoration device that is capable of operating the equipment regardless of the polarity of the calling line by providing a circuit that Even if the connection is reversed, the data can be transferred without failure.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a known example, FIG. 2 is a block diagram of a known transfer device, FIG. 3 is a detailed diagram of the present invention, and FIG. 4 is a schematic structural diagram of a known telephone line. Explanation of codes Calling telephone set 1, Calling telephone station 2, Control telephone station 3, Incoming telephone set 4
, transfer device 51, originating telephone 6, transfer destination telephone station 7, transfer destination telephone 8, bi-terminal 9, bell detection section 10, be hold relay 11, audio coupling transformer 12, line recovery detection section 13
．． Bidirectional amplifier 14, link relay 15, audio coupling transformer 16, seahold relay 17, switch terminal 18, line polarity detection section 19. Control section 20, mask reset control section 21, control section 22, reset timer 23, external reset input terminal 24, reset pull amplifier resistor 25, sea relay control section 26, main control section 27. master clock 2
8, auto dial control section 29, mensage tone control section 30, current limiting resistor 31, photo coupler 32, pull-up resistor 33, D flip-flop 34, OR gate 35, AND gate 36, negative inversion output 37, positive inversion output 38 , clock pulse generator 39.3 seconds type-4
0, BCD counter 41, decimal counter 42,
ORGATE 43, ATAYAL MONTAR CIRCUIT 44 Special fraud applicant Hiki Resco Co., Ltd. Procedural Amendment (Acid) April 5, 1980 Commissioner of the Patent Office Kazuo Wakasugi 1, Indication of Case 1982 Patent Application No. 37205 2. Title of the invention Telephone terminal equipment restoration method and device 3. Applicant's address 4-4 Araki-cho, Shinjuku-ku, Tokyo (1) Drawings (Figures 1 to 4) ) is corrected. 353-

Claims (1)

[Scope of Claims] [1] When a calling telephone sets a call to a called telephone line, the calling telephone calls the forwarding telephone through a transfer device, and the calling telephone sets and the forwarding telephone set connect to each other. In this method, when you pick up the receiver and receiver of the transfer destination phone to answer the phone, the polarity of the calling phone line is reversed to negative and positive, and a connection signal is sent. If the polarity is not normal, that is, if the polarity is negative or positive, the polarity of the calling telephone line is reversed to positive or negative, and the telephone terminal equipment restoration method restores the connection signal (2) When the calling telephone calls the incoming telephone line , in which a transfer destination telephone is called by the calling telephone line through a transfer device, and the calling telephone and the transfer destination telephone are connected so that a direct call can be made, the handset of the transfer destination telephone When you pick up the phone to answer, the polarity of the calling telephone line is reversed and becomes a connection signal, and when the polarity is restored, a circuit is installed that uses this as a device recovery signal. A telephone terminal device recovery device that allows devices to operate regardless of the situation.