Double-path switching coal mine dispatching communication system

Abstract

The invention discloses a double-path switching coal mine dispatching communication system which comprises a stored program control exchange host, a stored program control exchange standby machine, an intelligent double-path switching telephone set and a monitoring host. The invention provides a stored program control exchange with a remote circuit detection function and an intelligent double-circuit automatic switching telephone set. According to the invention, the large-area call service interruption caused by the single-point fault of a stored program control exchange or a line in the traditional dispatching communication system is overcome, and the problems that the dispatching communication system cannot detect the on-off of the line and the operation condition of a telephone set in real time, the communication fault is difficult to remove and the maintenance time is long are solved; when the main transmission line fails and cannot be used, the main transmission line can be automatically switched to the standby line, the reliability of the coal mine dispatching communication system is enhanced, the emergency communication capability of the dispatching communication system is improved, and the system is suitable for coal mine enterprises with high reliability requirements on the dispatching communication system.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine enterprise communications, in particular to a dual-path switching coal mine dispatching communication system. Background Art

[0002] As the most basic communication system for industrial and mining enterprises, fixed-line telephones are the most effective means to ensure smooth information flow. Although the emergence of mobile communications and smart phones today allows people to communicate voice and information more conveniently. However, fixed-line telephones are generally retained in coal mining enterprises due to their many advantages such as stable signals, no radiation, strong anti-interference, and habitual use. They are the most basic guarantee for internal dispatching communications in coal mines. Especially in underground coal mines, higher requirements are placed on the stability of coal mine dispatching communications. The "Coal Mine Safety Regulations" require that "the dispatching telephone of the wired coal mine dispatching communication system must be directly connected to the dispatching switch (including safety barriers) using mining communication cables, and it is strictly forbidden to use the earth as a loop. It is strictly forbidden to power the dispatching telephone locally underground, or to connect the dispatching switch via an active repeater. The repeater-free communication distance from the dispatching telephone to the dispatching switch should be no less than 10km".

[0003] The existing coal mine dispatching communication system is composed of a program-controlled switch, a multi-pair telephone transmission line and a dispatching telephone. This structure does not set up redundant structures for key equipment and transmission lines, which can easily cause communication interruptions due to system equipment or line failures, making it impossible to send dispatching instructions to the production site, which brings inconvenience to normal production dispatching and command. At the same time, due to the use of a multi-pair telephone transmission line, when the line is interrupted by a disaster, all telephones will not be able to communicate normally, and effective emergency communication capabilities cannot be formed, which brings obstacles to post-disaster command and emergency rescue. For this reason, we propose a dual-channel switching coal mine dispatching communication system. Summary of the invention

[0004] The purpose of the present invention is to provide a dual-path switching coal mine dispatching communication system to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, a dual-way switching coal mine dispatching communication system includes a programmable switch host, a programmable switch standby machine, an intelligent dual-way switching telephone and a monitoring host. The programmable switch host and the programmable switch standby machine are both arranged in a communication room. The output ports of the programmable switch host and the programmable switch standby machine are respectively connected to an intrinsically safe coupler. There are two intelligent dual-way switching telephones, and the output ports of the two intrinsically safe couplers are respectively connected to two intelligent dual-way switching telephones. The programmable switch host and the programmable switch standby machine lines are connected to a monitoring host, and the monitoring host is used to control the telephone service and monitor the operating status of the programmable switch host and the programmable switch standby machine.

[0006] As a preference, the program-controlled switch host and the program-controlled switch standby machine are operated in a hot standby mode, and the program-controlled switch host and the program-controlled switch standby machine both include a telephone monitoring module, a digital switching network, an input relay, an output relay, a hot standby circuit, a memory, a program-controlled switch CPU and an I / O device;

[0007] The telephone monitoring module provides line detection and telephone self-test data reported by the intelligent two-way switching telephone;

[0008] The digital switching network provides a switching network between telephone sets, trunk lines and signaling equipment;

[0009] The inbound relay is responsible for receiving telephone signals from external networks or other switches and passing these signals to the digital switching network for processing;

[0010] The outbound relay is responsible for outputting the telephone signal processed in the switch to the external network or other switches to complete the transmission of the call;

[0011] The hot backup circuit is used to monitor the host status and immediately switch to the backup machine once the host fails.

[0012] The memory provides storage for control programs;

[0013] The program-controlled switch CPU is used to execute all control logics of the switch;

[0014] The I / O device provides a program-controlled switch connected to a control host to perform telephone service control and equipment operation status monitoring.

[0015] Preferably, the two intelligent two-way switching telephones are each provided with a junction box on the outside, and the two junction boxes are respectively provided with a main transmission line and a backup transmission line. The programmable switching system host and the programmable switching system backup are respectively connected to the two intelligent two-way switching telephones through the main transmission line and the backup transmission line.

[0016] Preferably, the two intelligent two-way switching telephones are connected to two intrinsically safe couplers through a main transmission line and a backup transmission line respectively, and the intelligent two-way switching telephone includes a polarity protection circuit, a line detection and switching circuit, a status indicator light, a CPU, a keyboard, a noise reduction circuit, an AGC circuit, an audio amplifier circuit, a handset, a microphone and a ringing circuit;

[0017] The polarity protection circuit is used to detect and correct the polarity of the line;

[0018] The line detection and switching circuit is used to monitor the electrical characteristics of the main transmission line and the backup transmission line, detect abnormal conditions of the lines, and automatically switch to the backup line when the main line fails;

[0019] The status indicator light is used to provide the user with intuitive information about the operating status of the telephone;

[0020] The CPU provides self-test data of the intelligent two-way switching telephone, which is reported by the main transmission line and the backup transmission line at the same time;

[0021] The keyboard provides an interactive interface between the user and the telephone, supporting dialing, function settings and other user operations;

[0022] The noise reduction circuit is used to filter out unnecessary noise signals;

[0023] The AGC circuit is an automatic gain control circuit that adjusts the volume changes during calls to maintain a stable audio output level;

[0024] The audio amplifier circuit amplifies the audio signal during the call;

[0025] The handset converts the audio signal transmitted by the audio amplifier circuit into sound, so that the user can listen to the other party's speech;

[0026] The microphone captures the user's voice signal, converts the sound into an electrical signal, and transmits it to other circuits of the phone for processing and transmission;

[0027] The ringing circuit reminds the user that there is an incoming call and reminds the user to answer the call through sound.

[0028] Preferably, the programmable switching system host and the programmable switching system standby are respectively connected to a monitoring host via I / O devices arranged thereon; the monitoring host adopts an industrial control computer or server and is connected via Ethernet; the monitoring host is used to provide centralized collection and display of data such as call authority control, programmable switching system operation status, telephone self-test status, line detection and switching status.

[0029] Preferably, the call authority control includes number, selective call, emergency call, full call, forced insertion, forced removal, monitoring and recording dispatch call functions.

[0030] Preferably, the main transmission line and the backup transmission line are both multi-pair telephone cables.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The present invention adopts the structure of main / standby program-controlled switches, main / standby transmission lines and monitoring hosts, and performs redundant design on key equipment and lines of the coal mine dispatching communication system, thereby avoiding dispatching communication obstacles caused by single-point failures of system equipment and lines, and improving the reliability of the dispatching communication system. At the same time, the monitoring host performs real-time detection of the operating status of the program-controlled switches, lines and telephones, timely discovers system fault points, and shortens the system inspection and maintenance time.

[0033] 2. The present invention adopts a master / standby program-controlled switch to realize redundant design of key equipment, and adopts a hot standby circuit to realize mutual hot standby operation of two program-controlled switches, that is, when the master program-controlled switch fails, it automatically switches to the standby program-controlled switch.

[0034] 3. The present invention adopts a program-controlled switching system to directly supply power to the telephone and provide telephone services through an intrinsically safe coupler, meeting the requirements of the Coal Mine Safety Regulations: "The dispatch telephone of the wired coal mine dispatch communication system must be directly connected to the dispatch switch (including the safety barrier) using a mine communication cable, and it is strictly prohibited to use the ground as a loop. It is strictly prohibited for the dispatch telephone to be powered locally underground, or to be connected to the dispatch switch via an active repeater."

[0035] 4. The present invention adopts two multi-pair telephone transmission lines, main / backup, which are laid to telephones through different paths. When disasters such as mechanical damage to the line, fire, flooding, etc. occur, the main transmission line fails and cannot be used, and it can automatically switch to the backup line to ensure the reliable operation of the dispatching communication system's telephone business and emergency communication guarantee.

[0036] 5. The present invention uses a monitoring host to centrally manage system equipment and line status, and the monitoring host provides traffic registration services to the main / standby program-controlled switches at the same time, so that the main / standby program-controlled switches have consistent numbers and authority allocations, and the intelligent two-way switching telephones are simultaneously connected to the main / standby program-controlled switch service ports through the main / standby telephone transmission lines and are configured with the same telephone number. When the main / standby telephone transmission lines and the main / standby program-controlled switches are switched, the number resources used by the telephones are not changed.

[0037] 6. The present invention adds a line detection and switching circuit to the telephone, which detects whether the line is normal by monitoring the electrical characteristics of the main line and the backup line. When a fault is detected in the main line or the backup line, it automatically switches to the normal line. The CPU provides the telephone self-test data, reports the test results simultaneously through the main / backup telephone transmission line, detects the operating status of the telephone in real time, finds abnormal information of the telephone in time, shortens the troubleshooting time, and ensures the reliable operation of the dispatching communication system.

[0038] 7. The telephone of the present invention has a self-checking function. By monitoring the electrical parameters of the CPU, microphone, receiver, keyboard and other components, the operating status of the telephone is monitored in real time, and the status data of each telephone is reported through the transmission line. The program-controlled switch collects data, and the monitoring host summarizes and alarms the self-checking status of all telephones. The operation and maintenance personnel can promptly discover faulty telephones in daily management.

[0039] 8. The noise reduction circuit of the telephone of the present invention is arranged in the receiver circuit, which collects and analyzes the environmental noise, and then actively generates a sound whose spectrum is exactly the same as the environmental noise and whose phase is opposite to that of the environmental noise through the built-in circuit, so that the sound is superimposed and interfered with the noise in a specific space and eliminated, thereby reducing the environmental noise entering the call signal through the microphone, making the call effect clearer.

[0040] 9. The AGC dynamic gain adjustment circuit of the telephone of the present invention is set in the handset circuit, and the environmental noise acquisition signal is used as a reference value, and the handset input signal and the reference value are compared. If the input signal amplitude is less than the reference value range, the AGC circuit will increase the gain to increase the output signal amplitude; conversely, if the input signal amplitude is greater than the target range, the AGC circuit will reduce the gain to reduce the output signal amplitude. By dynamically adjusting the sound intensity of the handset, the anti-noise ability of the telephone is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is the use principle diagram of the present invention;

[0042] Figure 2 This is the schematic diagram of the noise reduction circuit;

[0043] Figure 3 This is the schematic diagram of the AGC circuit.

[0044] Explanation of the accompanying drawings: 1. mainframe of a program-controlled switching system; 2. backup machine of a program-controlled switching system; 3. monitoring module of a telephone set; 4. digital switching network; 5. input relay; 6. output relay; 7. hot backup circuit; 8. memory; 9. CPU of a program-controlled switching system; 10. I / O device; 11. intrinsically safe coupler; 12. main transmission line; 13. backup transmission line; 14. polarity protection circuit; 15. line detection and switching circuit; 16. status indicator light; 17. CPU; 18. keyboard; 19. noise reduction circuit; 20. AGC circuit; 21. audio amplifier circuit; 22. handset; 23. microphone; 24. ringing circuit; 25. intelligent two-way switching telephone set; 26. monitoring mainframe; 27. junction box. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0046] like Figure 1 As shown, the present invention provides a technical solution: a dual-way switching coal mine dispatching communication system, comprising a program-controlled switch host 1, a program-controlled switch standby machine 2, an intelligent dual-way switching telephone 25 and a monitoring host 26, the program-controlled switch host 1 and the program-controlled switch standby machine 2 are both arranged in a communication room, the output ports of the program-controlled switch host 1 and the program-controlled switch standby machine 2 are respectively connected to an intrinsically safe coupler 11, there are two intelligent dual-way switching telephones 25, the output ports of the two intrinsically safe couplers 11 are respectively connected to two intelligent dual-way switching telephones 25, the program-controlled switch host 1 and the program-controlled switch standby machine 2 are connected to the monitoring host 26, and the monitoring host 26 is used for the telephone service control and operation status monitoring of the program-controlled switch host 1 and the program-controlled switch standby machine 2.

[0047] It should be noted that the present invention uses a program-controlled switch to directly supply power to the telephone and provide telephone services through an intrinsically safe coupler 11, meeting the requirements of the Coal Mine Safety Regulations: "The dispatch telephone of the wired coal mine dispatch communication system must be directly connected to the dispatch switch (including the safety barrier) using a mine communication cable, and it is strictly forbidden to use the earth as a loop. It is strictly forbidden to power the dispatch telephone locally underground or connect it to the dispatch switch via an active repeater." The core components of the present invention include a program-controlled switch host 1, a program-controlled switch standby machine 2, an intelligent two-way switching telephone 25, and a monitoring host 26. The system workflow is as follows:

[0048] 1. Equipment configuration of the communication room: In the communication room, a program-controlled switch host 1 and a program-controlled switch standby 2 are installed, and the two are connected to the main transmission line 12 and the standby transmission line 13 respectively through a junction box 27;

[0049] 2. Line connection: The outputs of the program-controlled exchange host 1 and the program-controlled exchange standby 2 are respectively connected to the intelligent two-way switching telephone 25 through the junction box 27 and the intrinsically safe coupler 11. Each intelligent two-way switching telephone 25 simultaneously receives signals from the main transmission line 12 and the standby transmission line 13;

[0050] 3. Monitoring and switching mechanism: ① The monitoring host 26 monitors the operating status of the program-controlled exchange host 1 and the program-controlled exchange standby 2 in real time, and controls the telephone service. If the program-controlled exchange host 1 fails, the system will automatically switch to the program-controlled exchange standby 2 to ensure that the communication is not interrupted; ② The built-in line detection and switching circuit 15 of the intelligent two-way switching telephone 25 will detect the status of the transmission line. If there is a problem with the main transmission line 12, the telephone will automatically switch to the standby transmission line 13;

[0051] 4. Operation and control of the system: The monitoring host 26 provides call authority control, manages call functions, and records operating status. It can collect and display status information of various parts of the system, including the self-test status of the switch and telephone and the detection status of the line.

[0052] The program-controlled exchange host 1 and the program-controlled exchange standby 2 operate in a hot standby mode. The program-controlled exchange host 1 and the program-controlled exchange standby 2 both include a telephone monitoring module, a digital switching network 4, an input relay 5, an output relay 6, a hot standby circuit 7, a memory 8, a program-controlled exchange CPU 9 and an I / O device 10;

[0053] It should be noted that the telephone monitoring module 3 provides data for receiving line detection and telephone self-test reported by the intelligent two-way switching telephone 25; the digital switching network 4 provides a switching network between telephones, relay lines and signaling equipment; the input relay 5 is responsible for receiving telephone signals from the external network or other switches, and passing these signals to the digital switching network for processing; the output relay 6 is responsible for outputting the processed telephone signals in the switch to the external network or other switches to complete the call transmission; the memory 8 provides storage for the control program; the programmable switch CPU 9 is used to execute all control logic of the switch; the I / O device 10 provides the programmable switch with a control host for connection to perform call service control and equipment operation status monitoring.

[0054] The two intelligent two-way switching telephones 25 are each provided with a junction box 27 on the outside, and the two junction boxes 27 are respectively provided with a main transmission line 12 and a backup transmission line 13. The program-controlled switching system host 1 and the program-controlled switching system backup 2 are respectively connected to the two intelligent two-way switching telephones 25 via the main transmission line 12 and the backup transmission line 13.

[0055] It should be noted that the present invention adopts two multi-pair telephone transmission lines, main / backup, which are laid to telephones through different paths. When disasters such as mechanical damage to the line, fire, flooding, etc. occur, the main transmission line 12 fails and cannot be used, and it can automatically switch to the backup transmission line 13 to ensure the reliable operation of the dispatching communication system's telephone business and emergency communication guarantee.

[0056] like Figure 2 and Figure 3As shown, two intelligent two-way switching telephones 25 are respectively connected to two intrinsically safe couplers 11 through a main transmission line 12 and a backup transmission line 13. The intelligent two-way switching telephone 25 includes a polarity protection circuit 14, a line detection and switching circuit 15, a status indicator light 16, a CPU 17, a keyboard 18, a noise reduction circuit 19, an AGC circuit 20, an audio amplifier circuit 21, a handset 22, a microphone 23 and a ringing circuit 24;

[0057] It should be noted that, according to the number of traffic output ports of the program-controlled exchange, multiple intrinsically safe couplers 11 and intelligent two-way switching telephones 25 can be connected. The intrinsically safe coupler 11 is a safety device that converts non-intrinsically safe signals into intrinsically safe signals. The polarity protection circuit 14 is used to detect and correct the polarity of the line; the line detection and switching circuit 15 is used to monitor the electrical characteristics of the main transmission line 12 and the backup transmission line 13, detect abnormal conditions of the line, and automatically switch to the backup line when the main line fails; the status indicator 16 is used to provide the user with intuitive telephone operation status information; the CPU 17 provides the intelligent two-way switching telephone 25 with self-test data, and the main transmission line 12 and the backup transmission line 13 are used to detect the main transmission line 12 and the backup transmission line 13. The keyboard 18 provides an interactive interface between the user and the telephone, supporting dialing, function settings and other user operations; the noise reduction circuit 19 is used to filter out unnecessary noise signals; the AGC circuit 20 is an automatic gain control circuit, which adjusts the volume changes during the call and maintains a stable audio output level; the audio amplifier circuit 21 amplifies the audio signal during the call; the receiver 22 converts the audio signal transmitted by the audio amplifier circuit 21 into sound for the user to listen to the other party's speech; the microphone 23 captures the user's voice signal, converts the sound into an electrical signal, and transmits it to other circuits of the telephone for processing and transmission; the ringing circuit 24 prompts the user that there is an incoming call and reminds the user to answer the call through sound.

[0058] The telephone of the present invention has a self-checking function. By monitoring the operating electrical parameters of the CPU 17, microphone 23, handset 22 and keyboard 18, the operating status of the telephone is monitored in real time, and the status data of each telephone is reported through the transmission line. The program-controlled switch collects data, and the monitoring host 26 summarizes and alarms the self-checking status of all telephones. The operation and maintenance personnel can find faulty telephones in time during daily management; the telephone noise reduction circuit 19 is set in the handset 22 circuit, by collecting and analyzing environmental noise, and then actively generating a sound with a spectrum exactly the same as the environmental noise and an opposite phase through the built-in circuit, so that it is superimposed and interfered with the noise in a specific space and eliminated, thereby reducing the environmental noise entering the call signal through the microphone 23, making the call effect clearer.

[0059] The program-controlled switching system host 1 and the program-controlled switching system standby machine 2 are respectively connected to the monitoring host 26 through the I / O devices 10 arranged thereon. The monitoring host 26 adopts an industrial control computer or server and is connected using Ethernet. The monitoring host 26 is used to provide centralized collection and display of data such as call authority control, program-controlled switching system operation status, telephone self-test status, line detection and switching status.

[0060] It should be noted that the call authority control includes dispatch telephone functions such as number, selective call, emergency call, full call, forced insertion, forced removal, monitoring and recording. The monitoring host 26 is used to centrally manage the system equipment and line status, and the monitoring host 26 provides call registration services to the main / standby program-controlled switches at the same time, so that the main / standby program-controlled switches have consistent numbers and authority allocations. The intelligent two-way switching telephone 25 simultaneously accesses the main / standby program-controlled switch service port through the main / standby telephone transmission line and is configured with the same telephone number. When the main / standby telephone transmission line and the main / standby program-controlled switches are switched, the number resources used by the telephone are not changed.

[0061] The new telephone is equipped with a noise reduction circuit 19 and an AGC dynamic gain adjustment circuit. It collects and analyzes environmental noise, and then uses built-in circuit processing to actively generate a sound with a spectrum exactly the same as the environmental noise and an opposite phase, so that it can be superimposed and interfered with the noise in a specific space and eliminated. It also compares the environmental noise and the call sound at the earpiece 22 end, and uses AGC dynamic gain adjustment to amplify the call sound, thereby reducing the environmental noise in the earpiece 22 and making the call effect clearer.

[0062] In summary, the present invention can automatically switch to normally operating equipment and lines when a single point failure occurs, and monitor the operating status of the equipment and lines in real time. Its redundant structure improves the reliability of the coal mine dispatching communication system, enhances the emergency guarantee capability of the system in disaster situations, and reduces fault repair time. It is extremely suitable for coal mine enterprises that have high reliability requirements for dispatching communication systems.

[0063] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dual-channel switching coal mine dispatching communication system, characterized in that: The invention comprises a program-controlled exchange host (1), a program-controlled exchange standby machine (2), an intelligent two-way switching telephone (25) and a monitoring host (26). The program-controlled exchange host (1) and the program-controlled exchange standby machine (2) are both arranged in a communication room. The output ports of the program-controlled exchange host (1) and the program-controlled exchange standby machine (2) are respectively connected to an intrinsically safe coupler (11). There are two intelligent two-way switching telephones (25). The output ports of the two intrinsically safe couplers (11) are respectively connected to two intelligent two-way switching telephones (25). The program-controlled exchange host (1) and the program-controlled exchange standby machine (2) are connected to a monitoring host (26) by lines. The monitoring host (26) is used for controlling the telephone service and monitoring the operation status of the program-controlled exchange host (1) and the program-controlled exchange standby machine (2).

2. A dual-channel switching coal mine dispatching communication system according to claim 1, characterized in that: The program-controlled exchange host (1) and the program-controlled exchange standby (2) operate in a hot standby mode, and both the program-controlled exchange host (1) and the program-controlled exchange standby (2) include a telephone monitoring module (3), a digital switching network (4), an input relay (5), an output relay (6), a hot standby circuit (7), a memory (8), a program-controlled exchange CPU (9) and an I / O device (10); The telephone monitoring module (3) provides line detection and telephone self-check data reported by the intelligent two-way switching telephone (25); The digital switching network (4) provides a switching network between telephone sets, trunk lines and signaling equipment; The inbound relay (5) is responsible for receiving telephone signals from external networks or other switches and passing these signals to the digital switching network (4) for processing; The output relay (6) is responsible for outputting the telephone signal processed in the switch to the external network or other switches to complete the transmission of the call; The hot backup circuit (7) is used to monitor the status of the host (26) and immediately switch to the backup machine once the host fails. The memory (8) provides storage for the control program; The program-controlled switch CPU (9) is used to execute all control logics of the switch; The I / O device (10) provides a program-controlled switch connected to a control host (26) to perform telephone service control and equipment operation status monitoring.

3. A dual-channel switching coal mine dispatching communication system according to claim 1, characterized in that: A junction box (27) is disposed outside the two intelligent two-way switching telephones (25), and a main transmission line (12) and a backup transmission line (13) are disposed in the two junction boxes (27), respectively. The program-controlled exchange host (1) and the program-controlled exchange backup (2) are connected to the two intelligent two-way switching telephones (25) via the main transmission line (12) and the backup transmission line (13), respectively.

4. A dual-channel switching coal mine dispatching communication system according to claim 1, characterized in that: The two intelligent two-way switching telephones (25) are respectively connected to two intrinsically safe couplers (11) through a main transmission line (12) and a backup transmission line (13), and the intelligent two-way switching telephone (25) comprises a polarity protection circuit (14), a line detection and switching circuit (15), a status indicator light (16), a CPU (17), a keyboard (18), a noise reduction circuit (19), an AGC circuit (20), an audio amplifier circuit (21), a handset (22), a microphone (23) and a ringing circuit (24); The polarity protection circuit (14) is used to detect and correct the polarity of the line; The line detection and switching circuit (15) is used to monitor the electrical characteristics of the main transmission line (12) and the backup transmission line (13), detect abnormal conditions of the lines, and automatically switch to the backup line when the main line fails; The status indicator light (16) is used to provide the user with intuitive telephone operation status information; The CPU (17) provides self-test data of the intelligent two-way switching telephone (25), which is reported simultaneously by the main transmission line (12) and the backup transmission line (13); The keyboard (18) provides an interactive interface between the user and the telephone, supporting dialing, function setting and other user operations; The noise reduction circuit (19) is used to filter out unnecessary noise signals; The AGC circuit (20) is an automatic gain control circuit that adjusts volume changes during a call to maintain a stable audio output level; The audio amplifier circuit (21) amplifies the audio signal during the call; The receiver (22) converts the audio signal transmitted by the audio amplifier circuit (21) into sound, so that the user can listen to the other party's speech; The microphone (23) captures the user's voice signal, converts the sound into an electrical signal, and transmits it to other circuits of the telephone for processing and transmission; The ringing circuit (24) reminds the user of an incoming call and reminds the user to answer the call through sound.

5. A dual-channel switching coal mine dispatching communication system according to claim 1, characterized in that: The program-controlled exchange host (1) and the program-controlled exchange standby (2) are respectively connected to a monitoring host (26) via I / O devices (10) arranged thereon. The monitoring host (26) is an industrial control computer or a server and is connected via Ethernet. The monitoring host (26) is used to provide centralized collection and display of data such as call authority control, program-controlled exchange operation status, telephone self-test status, line detection and switching status.

6. A dual-channel switching coal mine dispatching communication system according to claim 5, characterized in that: The call authority control includes dispatch call functions such as number, selective call, emergency call, full call, forced insertion, forced removal, monitoring and recording.

7. A dual-channel switching coal mine dispatching communication system according to claim 3, characterized in that: The main transmission line (12) and the backup transmission line (13) are both multi-pair telephone cables.

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