Telephone tapping control circuit and telephone tapping device

Abstract

The present invention discloses a telephone branch control circuit and a telephone branch device, which relate to the field of communication technology. The telephone branch control circuit includes: a detection circuit, which is used to detect faults in the communication line; a control module, which is used to receive the fault signal of the detection circuit; a switching switch, which connects two communication lines to the control module respectively. When the two communication lines are normal, they are switched according to the incoming call ringing signal. When the detection circuit detects that one of the communication lines has a fault, the control module controls the switching switch to switch to the other communication line. Single-phone two-way automatic transfer communication can realize one-machine two-way communication, which can solve the problem that one communication line fails and cannot communicate normally without manual switching. In underground applications, it can reduce the use of telephones and the number of communication cables. At the same time, it can also ensure safety and risk avoidance and emergency rescue communication needs in underground optical fiber and cable dual hybrid line communications, and improve the quality of communication.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a telephone branching control circuit and a telephone branching device. Background Art

[0002] Mine communication systems, also known as mine communications systems, are crucial tools for safe production scheduling, risk avoidance, and emergency rescue in metal and non-metal mines. The state mandates that all mines under construction and in production must have comprehensive communication systems, which are included in the six major underground systems subject to key inspection and management. To ensure standardized construction and management of communication systems, the Ministry of Emergency Management's Work Safety Supervision Bureau, in addition to including specific requirements in the safety regulations for coal mines and metal and non-metal mine construction, has also issued safety standards for communication systems in these mines.

[0003] Articles 4.4 and 4.5 of the "Specifications for the Construction of Communication and Liaison Systems in Metal and Non-metal Underground Mines" (AQ2036-2011) require that "4.4 The locations for installing communication and liaison terminal equipment should include: the pit parking lot, the horse head gate, the underground transportation dispatch room, the main electromechanical chamber, the underground substation, the various middle mining areas of the underground, the main pump room, the main ventilation room, the underground emergency shelter facilities, the centralized location for evacuating personnel during blasting, the hoisting room, the underground blasting equipment warehouse, the mining loading and unloading point, etc. 4.5 The communication cables should be divided into two and enter the underground wiring equipment from different shafts. When any of the communication cables fails, the capacity of the other cable should be able to bear the communication capacity of each communication terminal in the underground." It is mandatory to enter the underground communication telephone with two-way cables in different shafts. The signal transmission stability of underground double-circuit communication cables is poor, the loss is large, the sound quality is poor, and the cable investment cost is high; the signal transmission of double-circuit optical fiber communication is stable, the loss is small, the sound quality is high, and the cable investment cost is low, but it cannot guarantee the safety and risk avoidance and emergency rescue communication needs; underground optical fiber and cable dual hybrid line communication can reduce cable investment and solve the problems of poor signal transmission stability, large loss, and poor sound quality; telephone branch control circuit and telephone branch device automatically control single-phone dual-line calls, and have the function of automatic transfer control of dual-line communication when the communication cable fails. Combined with underground optical fiber and cable dual hybrid line communication, it can guarantee safety and risk avoidance and emergency rescue communication needs. Summary of the Invention

[0004] The purpose of the present invention is to provide a telephone tapping control circuit and a telephone tapping device, which can not only ensure the safety and emergency rescue communication needs, but also improve the quality of underground communication.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A first aspect of an embodiment of the present invention provides a telephone tapping control circuit, the telephone tapping control circuit comprising: a detection circuit, the detection circuit being used to detect a fault in a communication line; a control module, the control module being connected to the detection circuit and being used to receive a fault signal from the detection circuit; a switching switch, the switching switch being respectively connected to two communication lines and the control module, and when both communication lines are normal, switching is performed according to an incoming call ringing signal; when the detection circuit detects a fault in one of the communication lines, the fault signal is transmitted to the control module, and the control module controls the switching switch to switch to the other communication line.

[0007] In some embodiments, the two communication lines include an optical cable communication line and an electrical cable communication line.

[0008] In some embodiments, the detection circuit includes a first relay, a second relay and a first transistor, the base of the first transistor receives a cable signal, the first transistor is connected to the control end of the first relay, and the controlled end of the first relay is connected to the control module, so that the first transistor sends a fault cable signal to the control module through the first relay, the control end of the second relay is connected to a remote user module, and the controlled end is connected to the control module.

[0009] In some embodiments, the detection circuit further includes a three-terminal voltage regulator and a first voltage regulator diode, the three-terminal voltage regulator is connected in parallel with the first voltage regulator diode and connected to the cable signal, and the output end of the three-terminal voltage regulator is connected to the base of the first transistor.

[0010] In some embodiments, the switching switch includes a second transistor, a third relay and a fourth relay, the control module is connected to the base of the second transistor to control the operation of the second transistor, the second transistor is connected to the control end of the third relay to control the operation of the third relay, and the control module is connected to the control end of the fourth relay to control the operation of the fourth relay; the controlled end of the third relay is respectively connected to the cable communication line and the optical cable communication line to eliminate the mutual interference between the incoming call ring current detection signal and the call signal; the controlled end of the fourth relay is respectively connected to the telephone connection terminal, the cable communication line and the optical cable communication line to control the telephone connection terminal to select connection with the cable communication line or the optical cable communication line according to the line fault signal or the incoming call ring current signal.

[0011] In some embodiments, the telephone branch control circuit further includes: a first optocoupler, wherein the control end of the first optocoupler is connected to the cable communication line, and the controlled end is connected to the control module; a second optocoupler, wherein the control end of the second optocoupler is connected to the optical cable communication line, and the controlled end is connected to the control module.

[0012] In some embodiments, the telephone branch control circuit also includes a first rectifier bridge, a second rectifier bridge, a second zener diode and a third zener diode, the input end of the first rectifier bridge is connected to the cable communication line and the controlled end of the third relay, the input end of the second rectifier bridge is connected to the optical cable communication line and the controlled end of the third relay, the output end of the first rectifier bridge is connected to the control end of the first optocoupler through the second zener diode, and the output end of the second rectifier bridge is connected to the control end of the second optocoupler through the third zener diode.

[0013] In some embodiments, the telephone tap control circuit further includes a manual switch for controlling the operation of the switching switch, the manual switch being connected to the control module, and the manual switch controlling the switching line of the switching switch through the control module.

[0014] In some embodiments, the telephone drop control circuit further includes a first indicator light indicating cable communication and a second indicator light indicating optical cable communication, and both the first indicator light and the second indicator light are connected to the control module.

[0015] A second aspect of the embodiments of the present invention provides a telephone tapping device, which includes the telephone tapping control circuit described above.

[0016] According to the embodiments of the present invention, a telephone tapping control circuit and a telephone tapping device have at least the following beneficial effects: combining the advantages and disadvantages of optical fiber communication and cable communication, and combining the advantages of photoelectric communication signals, not only can the safety and risk avoidance and emergency rescue communication needs be guaranteed, but also the quality of underground communication is improved, and the construction cost of underground communication cables is greatly reduced. At the same time, with its excellent device function and economy, it plays a positive role in promoting the recognition and revision of the application standards of underground optical and electrical line hybrid communication technology.

[0017] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 is a schematic diagram of a telephone tap control circuit according to an embodiment;

[0020] Figure 2 FIG. 4 is a principle block diagram of a tapping device according to an embodiment.

[0021] The description of the reference numerals is as follows: 1. Cable communication line; 2. Optical cable communication line; 3. Telephone terminal; 4. Remote user module; 5. Power module; 6. Battery pack; 100. Telephone tapping control circuit; 200. Telephone tapping device. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0024] The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Thus, a feature identified as "first," "second," or "third" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0025] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "connected," "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0026] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that the description of this disclosure will be more comprehensive and complete, and will fully convey the concepts of the example embodiments to those skilled in the art. The accompanying drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. Identical reference numerals in the figures indicate identical or similar parts, and thus repeated descriptions thereof will be omitted.

[0027] The telephone tap control circuit 100 according to an embodiment of the present application is briefly described below:

[0028] According to some embodiments, the present application provides a telephone tap control circuit, wherein the telephone tap control circuit 100 includes:

[0029] A detection circuit, the detection circuit is used to detect communication line faults and incoming call ringing signals;

[0030] A control module connected to the detection circuit and configured to receive fault and ring current signals from the detection circuit;

[0031] A switching switch connects the two communication lines to the control module respectively. When both communication lines are normal, they are switched according to the incoming ringing signal. When the detection circuit detects that one of the communication lines is faulty, the fault signal is transmitted to the control module, and the control module controls the switching switch to switch to the other communication line.

[0032] The following is in conjunction with the appendix of this manual Figure 1 , the telephone branch control circuit 100 of the present application is further elaborated.

[0033] According to some embodiments, the two communication lines include an optical cable communication line 2 and an electrical cable communication line 1 .

[0034] Based on the above embodiment, when cable communication line 1 fails, the control module controls the switch to switch to optical cable communication line 2. When optical cable communication line 2 fails, the control module controls the switch to switch to cable communication line 1. When both cable communication line 1 and optical cable communication line 2 are functioning properly, the switch switches to cable communication line 1. Incoming calls on cable communication line 1 are answered via cable communication line 1, while incoming calls on optical cable communication line 2 are answered via optical cable communication line 2. In other words, when both lines are functioning properly, the line to be answered is selected based on the incoming call ringing current.

[0035] In other embodiments, there may be two optical cable communication lines 2 or two cable communication lines 1. The advantage of using a combination of cable communication line 1 and optical cable communication line 2 is that the optical cable communication line 2 has high transmission efficiency and large transmission capacity, while the cable communication line 1 has high stability.

[0036] Combining the advantages and disadvantages of optical fiber communication and cable communication, and combining the advantages of photoelectric communication signals, not only can the safety and risk avoidance and emergency rescue communication needs be guaranteed, but also the quality of underground communication can be improved, and the construction cost of underground communication cables can be greatly reduced.

[0037] According to some embodiments, the detection circuit includes a first relay K1, a second relay K2 and a first transistor Q1, the base of the first transistor Q1 receives a cable signal, the first transistor Q1 is connected to the control end of the first relay K1, and the controlled end of the first relay K1 is connected to the control module, so that the first transistor Q1 sends a faulty cable signal to the control module through the first relay K1, the control end of the second relay K2 is connected to the remote user module 4, and the controlled end is connected to the control module.

[0038] Among them, the control module uses NE555 chip.

[0039] Based on the above embodiments, Figure 1 As shown, the base of the first transistor Q1 receives the cable line fault signal, the collector of the first transistor Q1 is connected to the +12V power supply through the control end (coil end) of the first relay K1, and the emitter of the first transistor Q1 is grounded, so that the first transistor Q1 controls the operation of the first relay K1 according to the cable signal. The controlled end of the first relay K1 is in a normally closed state, and the controlled end of the first relay K1 is respectively connected to the ground and the NE555 chip pin 2, the control end of the second relay K2 is respectively connected to the +12V power supply and the remote user module 4, and the controlled end of the second relay K2 is respectively connected to the +12V power supply and the NE555 chip pin 6.

[0040] Among them, the control end of the first relay K1 is connected in parallel with a diode D1, and the control end of the second relay K2 is connected in parallel with a diode D2, which is used to quickly eliminate the potential of the relay coil when the power is off, which is beneficial to protecting electronic components and extending the service life of electronic components.

[0041] Among them, the NE555 chip pin 2 is connected to the pull-up resistor R11, and the NE555 chip pin 6 is connected to the pull-down resistor R10.

[0042] The above working principle is:

[0043] When cable communication line 1 and optical cable communication line 2 are in good condition, the base of the first transistor Q1 receives a high level signal from the cable, and the first transistor Q1 controls the first relay K1 to operate. The controlled end of the first relay K1 is disconnected, and the NE555 chip pin 2 does not receive a low level and is pulled up by the resistor R11. At this time, the NE555 chip controls the switch to communicate on cable communication line 1. If a call comes in on optical cable communication line 2 at this time, the ringing current signal triggers the G02 optocoupler to turn on, and the NE555 chip pin 2 receives a low level. At this time, the NE555 chip controls the switch to switch to optical cable communication line 2 for communication.

[0044] When the cable communication line 1 fails, the base of the first transistor Q1 receives a low-level cable signal, the first transistor Q1 controls the first relay K1 to stop working, the controlled end of the first relay K1 is closed, and the NE555 chip pin 2 receives a low-level signal. At this time, the NE555 chip controls the switch to switch to the optical cable communication line 2 for communication until the cable communication line 2 recovers.

[0045] When the optical cable communication line 2 or the remote user module 4 fails, the remote user module 4 outputs a fault signal to control the control end of the second relay K2 to be energized, the second relay K2 works, the controlled end of the second relay K2 is energized, and the NE555 chip pin 6 is pulled up. At this time, the NE555 chip controls the switch to switch to use the cable communication line 1 for communication and locks on the cable communication line 1 for communication until the optical cable communication line 2 or the remote user module 4 recovers.

[0046] According to some embodiments, the detection circuit further includes a three-terminal voltage regulator L7805 and a first voltage regulator diode DZ1. The three-terminal voltage regulator L7805 is connected in parallel with the first voltage regulator diode DZ1 and connected to the cable signal. The output end of the three-terminal voltage regulator L7805 is connected to the base of the first transistor Q1.

[0047] Based on the above embodiments, Figure 1 As shown, the cable line fault signal source is a DC48V electrical signal. After the line voltage is stepped down and stabilized, a +5V voltage is input to the base of the first transistor Q1 to protect the first transistor Q1 from breakdown. The three-terminal voltage regulator L7805 and the first Zener diode DZ1 both perform voltage step-down and voltage stabilization functions.

[0048] Furthermore, the detection circuit also includes resistors R1, R2 and R3, wherein the DC48V positive electrode XC+ is connected to the negative electrode of the first voltage regulator diode DZ1 and the input end of the three-terminal voltage regulator L7805 through the resistor R1, and the output end of the three-terminal voltage regulator L7805 is connected to the base of the first transistor Q1 through the resistor R2. The resistors R1 and R2 both play the role of current limiting protection of electronic components. The base of the first transistor Q1 is grounded through the resistor R3. The resistor R3 is used for voltage division so that the base of the first transistor Q1 can be quickly turned off.

[0049] According to some embodiments, the switching switch includes a second transistor Q2, a third relay K3, and a fourth relay K4, the control module is connected to the base of the second transistor Q2 to control the operation of the second transistor Q2, the second transistor Q2 is connected to the control end of the third relay K3 to control the operation of the third relay K3, and the control module is connected to the control end of the fourth relay K4 to control the operation of the fourth relay K4;

[0050] The controlled end of the third relay K3 is connected to the cable communication line 1 and the optical cable communication line 2 respectively, so as to eliminate the interference between the incoming call ring current detection signal and the call signal;

[0051] The controlled end of the fourth relay K4 is respectively connected to the telephone connection terminal 3, the cable communication line 1 and the optical cable communication line 2, so as to control the telephone connection terminal 3 to select the connection with the cable communication line 1 or the optical cable communication line 2 according to the line fault signal or the incoming call ringing signal.

[0052] Among them, the control module uses NE555 chip.

[0053] Based on the above embodiments, Figure 1 As shown, pin 3 of the NE555 chip is connected to the base of the second transistor Q2 via resistor R12. The base of the second transistor Q2 is connected to ground via resistor R13 and capacitor C6. The collector of the second transistor Q2 is connected to a +12V power supply via the control terminal of the third relay K3, and the emitter of the second transistor Q2 is grounded. Pin 3 of the NE555 chip is connected to ground via the control terminal of the fourth relay K4 to control the on and off of the fourth relay K4.

[0054] Among them, the control end of the third relay K3 is connected in parallel with a diode D3, and the control end of the fourth relay K4 is connected in parallel with a diode D4, which is used to quickly eliminate the potential of the relay coil when the power is off, which is beneficial to protecting electronic components and extending the service life of electronic components.

[0055] The third relay K3 and the fourth relay K4 are double-pole double-throw relays.

[0056] The above working principle is:

[0057] When the NE555 chip controls the cable communication line 1, the NE555 chip pin 3 outputs a low level, the control ends (coils) of the third relay K3 and the fourth relay K4 are not energized, and the controlled end of the third relay K3 controls the second loop of the cable communication line 1 and is not connected. The controlled end of the fourth relay K4 controls the first and second loops of the cable communication line 1 and is connected to the telephone terminal 3. Figure 1 Connection method shown.

[0058] When the NE555 chip controls optical cable communication line 2, pin 3 of the NE555 chip outputs a high level, energizing the control terminals (coils) of both the third relay K3 and the fourth relay K4. The controlled terminal of the third relay K3 blocks the first loop of optical cable communication line 2. The controlled terminal of the fourth relay K4 connects both the first and second loops of optical cable communication line 2 to telephone terminal 3.

[0059] According to some embodiments, the telephone tap control circuit 100 further includes:

[0060] A first optical coupler G01 , wherein the control end of the first optical coupler G01 is connected to the cable communication line 1 , and the controlled end is connected to the control module.

[0061] A second optical coupler G02, wherein the control end of the second optical coupler G02 is connected to the optical cable communication line 2, and the controlled end is connected to the control module.

[0062] Among them, the control module uses NE555 chip.

[0063] Based on the above embodiment, the first optocoupler G01 is used to send the cable communication ring current signal to the NE555 chip, so that the NE555 chip can obtain the status of the cable communication line 1 in real time. The NE555 chip controls the connection between the telephone connection terminal 3 and the cable communication line 1 according to the cable communication ring current signal. The second optocoupler G02 is used to send the optical cable communication ring current signal to the NE555 chip, so that the NE555 chip can obtain the status of the optical cable communication line 2 in real time. The NE555 chip controls the connection between the telephone connection terminal 3 and the optical cable communication line 2 according to the optical cable communication signal.

[0064] Its specific structure is as follows Figure 1 As shown, one end of the controlled end of the first optocoupler G01 is connected to the +12V power supply, and the other end is connected to the NE555 chip pin 6; one end of the controlled end of the second optocoupler G02 is grounded, and the other end is connected to the NE555 chip pin 2.

[0065] The above working principle is:

[0066] When the cable communication line 1 is normal and works using the cable communication line 1, the NE555 chip pin 6 does not receive the high-level signal of the first optocoupler G01; when the cable communication line 1 fails, the NE555 chip pin 6 does not receive the high-level signal of the first optocoupler G01.

[0067] When optical cable communication line 2 is normal and working via optical cable communication line 2, the level of NE555 chip pin 2 is pulled low by the second optocoupler G02. When optical cable communication line 2 is used or optical cable communication line 2 fails, NE555 chip pin 2 does not receive the location signal from the second optocoupler G02. At the same time, if optical cable communication line 2 fails, the second relay K2 is energized, and NE555 chip pin 6 is pulled high. At this time, communication switches to using cable communication line 1.

[0068] According to some embodiments, the telephone branch control circuit 100 also includes a first rectifier bridge DB1, a second rectifier bridge DB2, a second zener diode DZ2 and a third zener diode DZ3, the input end of the first rectifier bridge DB1 is connected to the cable communication line 1 and the controlled end of the third relay K3, the input end of the second rectifier bridge DB2 is connected to the optical cable communication line 2 and the controlled end of the third relay K3, the output end of the first rectifier bridge DB1 is connected to the control end of the first optocoupler G01 through the second zener diode DZ2, and the output end of the second rectifier bridge DB2 is connected to the control end of the second optocoupler G02 through the third zener diode DZ3.

[0069] When the NE555 chip controls cable communication line 1, pin 3 of the NE555 chip outputs a low level, and the controlled end of the third relay K3 controls the first loop of optical cable communication line 1 to connect to the negative electrode of the second rectifier bridge DB2. When the NE555 chip controls optical cable communication line 2, pin 3 of the NE555 chip outputs a high level, and the controlled end of the third relay K3 controls the second loop of optical cable communication line 2 to connect to the negative electrode of the first rectifier bridge DB1.

[0070] Based on the above embodiments, Figure 1 As shown, the telephone tap control circuit 100 further includes a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a resistor R4, a resistor R5, a resistor R6, and a resistor R7, wherein the input end of the first rectifier bridge DB1 is connected to the cable communication line 1 via the capacitor C1, and the output end is connected to one end of the capacitor C3, one end of the resistor R6, and the cathode of the second Zener diode DZ2 via the resistor R4, the other end of the capacitor C3 and the anode of the second Zener diode DZ2 are grounded, and the other end of the resistor R6 is connected to the control end of the first optocoupler G01.

[0071] The input end of the second rectifier bridge DB2 is connected to the optical cable communication line 2 through the capacitor C2, and the output end is connected to one end of the capacitor C4, one end of the resistor R7 and the negative electrode of the third voltage-stabilizing diode DZ3 through the resistor R5. The other end of the capacitor C4 and the positive electrode of the third voltage-stabilizing diode DZ3 are grounded, and the other end of the resistor R7 is connected to the control end of the second optocoupler G02.

[0072] Among them, the first rectifier bridge DB1 and the second rectifier bridge DB2 are used for 90±15V, 25±3Hz AC ringing current voltage rectification and transformation of the communication line, capacitors C1 and C2 are used for coupling, capacitors C3 and C4 are used for filtering, and resistors R4, R5, R6 and R7 are used for current limiting protection of electronic components.

[0073] In this example, the output state transition of the NE555 chip is based on the following: when the voltage on pin 2 drops to one-third of the power supply voltage, the output on pin 3 flips from a low level to a high level; when the voltage on pin 6 rises to two-thirds of the power supply voltage, the output on pin 3 flips from a high level to a low level.

[0074] According to some embodiments, the telephone drop control circuit 100 further includes a manual switch for controlling the operation of the transfer switch. The manual switch is connected to the control module, and the manual switch controls the transfer switch to switch lines through the control module.

[0075] Based on the above embodiments, Figure 1 As shown, the manual switch includes a switch SX and a switch SG, wherein two ends of the switch SX are respectively connected to a +12V power supply and a pin 6 of the NE555 chip, and two ends of the switch SG are respectively connected to a ground and a pin 2 of the NE555 chip.

[0076] According to some embodiments, the telephone drop control circuit 100 further includes a first indicator light LED1 indicating cable communication and a second indicator light LED2 indicating optical cable communication, and both the first indicator light LED1 and the second indicator light LED2 are connected to the control module.

[0077] Based on the above embodiments, Figure 1 The positive electrode of the first warning light LED1 is connected to the +12V power supply through the resistor R14, and the negative electrode is connected to the NE555 chip pin 3. The positive electrode of the second warning light LED2 is connected to the NE555 chip pin 3 through the resistor R15, and the negative electrode is grounded.

[0078] When cable communication line 1 is normal and working with cable communication line 1, NE555 chip pin 3 is low, the first indicator LED1 is on, and the second indicator LED2 is off, indicating that cable communication is being used. When optical cable communication line 2 is normal and working with optical cable communication line 2, NE555 chip pin 3 is high, the first indicator LED1 is off, and the second indicator LED2 is on, indicating that optical cable communication is being used.

[0079] The following is in conjunction with the appendix of this manual Figure 2 , the telephone branch device 200 of the present application is further elaborated.

[0080] According to some embodiments, the present application provides a telephone tapping device, which includes the telephone tapping control circuit 100 as described above.

[0081] Based on the above embodiments, Figure 2 As shown, the telephone tapping device 200 also includes a power module 5 and a battery pack 6. The input end of the power module 5 is connected to an AC 220V power supply, an optical fiber composite cable power supply, and a 48V battery pack 6. The AC 220V power supply is used to provide a dual power automatic switch output power supply for the underground, and the optical fiber composite cable power supply is used to transmit AC or DC power to the surface. The power module 5 has power conversion, voltage conversion, battery charging and discharging, and other power conversion monitoring and protection functions. The optical cable communication line 2 is connected to the telephone tapping control circuit 100 through the remote user module 4. The output end of the power module 5 is connected to the remote user module 4 and the telephone tapping control circuit 100. The telephone tapping control circuit 100 is also connected to the cable communication line 1 and one end of the telephone terminal 3. The other end of the telephone terminal 3 can be connected to multiple telephones for use.

[0082] In some embodiments, the telephone tapping device 200 is equipped with multiple standardized multi-channel plug-in telephone tapping control circuit boards, which are connected to multiple telephones via telephone connection terminals 3. When a cable fault is detected in the telephone tapping device 200, all telephone tapping control circuits switch to optical cable communication. When an optical cable fault occurs, all telephone tapping control circuits switch to cable communication.

[0083] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0084] While the present disclosure has been described with reference to several exemplary embodiments, it should be understood that the terms used are illustrative and exemplary rather than restrictive. Since the present disclosure can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above-described embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope of the appended claims. Therefore, all changes and modifications that fall within the scope of the claims or their equivalents are intended to be covered by the appended claims.

Claims

1. A telephone tap control circuit, characterized in that: The telephone tap control circuit comprises: A detection circuit, the detection circuit being used to detect a fault in the communication line; a control module, the control module being connected to the detection circuit and configured to receive a fault signal from the detection circuit; A switching switch, wherein the switching switch connects the two communication lines to the control module respectively. When both communication lines are normal, the switching switch is used according to the incoming call ringing signal. When the detection circuit detects that one of the communication lines is faulty, the fault signal is transmitted to the control module, and the control module controls the switching switch to switch to the other communication line. The detection circuit includes a first relay, a second relay and a first transistor. The base of the first transistor receives a cable signal. The first transistor is connected to the control end of the first relay. The controlled end of the first relay is connected to the control module, so that the first transistor sends a faulty cable signal to the control module through the first relay. The control end of the second relay is connected to a remote user module, and the controlled end is connected to the control module.

2. The telephone tap control circuit according to claim 1, characterized in that: The two communication lines include an optical cable communication line and an electrical cable communication line.

3. The telephone tap control circuit according to claim 1, characterized in that: The detection circuit further includes a three-terminal voltage regulator and a first voltage regulator diode. The three-terminal voltage regulator is connected in parallel with the first voltage regulator diode and is connected to the cable signal. The output end of the three-terminal voltage regulator is connected to the base of the first transistor.

4. The telephone tap control circuit according to claim 2, characterized in that: The switching switch includes a second transistor, a third relay, and a fourth relay, the control module is connected to the base of the second transistor to control the operation of the second transistor, the second transistor is connected to the control end of the third relay to control the operation of the third relay, and the control module is connected to the control end of the fourth relay to control the operation of the fourth relay; The controlled end of the third relay is connected to the cable communication line and the optical cable communication line respectively, so as to eliminate the mutual interference between the incoming call ring current detection signal and the call signal; The controlled end of the fourth relay is respectively connected to the telephone connection terminal, the cable communication line and the optical cable communication line, so as to control the telephone connection terminal to select the connection with the cable communication line or the optical cable communication line according to the line fault signal or the incoming call ringing signal.

5. The telephone tap control circuit according to claim 4, characterized in that: The telephone tap control circuit also includes: a first optical coupler, wherein a control end of the first optical coupler is connected to a cable communication line, and a controlled end of the first optical coupler is connected to the control module; A second optical coupler, wherein the control end of the second optical coupler is connected to the optical cable communication line, and the controlled end is connected to the control module.

6. The telephone tap control circuit according to claim 5, characterized in that: The telephone branch control circuit also includes a first rectifier bridge, a second rectifier bridge, a second zener diode and a third zener diode. The input end of the first rectifier bridge is connected to the cable communication line and the controlled end of the third relay, the input end of the second rectifier bridge is connected to the optical cable communication line and the controlled end of the third relay, the output end of the first rectifier bridge is connected to the control end of the first optocoupler through the second zener diode, and the output end of the second rectifier bridge is connected to the control end of the second optocoupler through the third zener diode.

7. The telephone tap control circuit according to claim 1, characterized in that: The telephone tapping control circuit further includes a manual switch for controlling the operation of the switching switch. The manual switch is connected to the control module, and the manual switch controls the switching line of the switching switch through the control module.

8. The telephone tap control circuit according to claim 1, characterized in that: The telephone drop control circuit further includes a first prompt light for displaying cable communication and a second prompt light for displaying optical cable communication, and both the first prompt light and the second prompt light are connected to the control module.

9. A telephone branching device, characterized in that: The tapping device comprises the telephone tapping control circuit according to any one of claims 1 to 8.

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