Interactive double-end line tracking and talkback test system and method

Abstract

The invention relates to an interactive double-end line tracking and talkback test system and method. The interactive double-end line tracking and talkback test system comprises a main test terminal and a remote line tracking slave end, the main test terminal is used for being held and operated by operation and maintenance personnel, starting a hunting mode and sending a digital coding signal; and the remote hunting slave terminal is used for scanning on the distribution frame after receiving the digital coding signal, and sending a hunting success signal when a correct signal is detected. According to the invention, hunting, testing and talkback functions can be integrated, and integrated intelligent testing of two-end intelligent cooperation, accurate positioning and flow closed loop can be realized.

Description

Technical Field

[0001] This invention belongs to the field of communication line testing and maintenance technology, and relates to a circular two-way line tracing and intercom testing system and method, especially an interactive two-way line tracing and intercom testing system and method. Background Technology

[0002] In today's office and communication environment, despite the widespread adoption of mobile and wireless networks, copper-based fixed-line telephone lines and some local area network (LAN) lines remain an indispensable part of enterprise communication infrastructure due to their stability, security, and cost advantages. However, the installation, tracing, termination, testing, and maintenance of these lines have long relied on a cumbersome, inefficient, and highly experience-intensive traditional operating model.

[0003] The currently prevalent technical solutions in the industry and their inherent defects are as follows: 1. Discrete tools and fragmented processes: Maintenance personnel need to carry and use at least two tools alternately: an audio cable finder or line tester (to find the target cable from multiple cables), and a regular telephone (to finally verify the voice call function).

[0004] This frequent switching between tools not only reduces work efficiency and increases the burden of tool management and carrying, but also creates human-caused "breakpoints" in the process. For example, after successfully locating a cable, you need to put down the cable finder, pick up the punch-down tool to terminate it, and then connect the phone for testing. Neglecting any step could lead to the loss of all previous efforts.

[0005] 2. Coordination dilemmas and signal crosstalk in the line-finding process: The Collaboration Dilemma: Cable tracing typically requires two maintenance personnel (A and B) to be positioned at opposite ends of the cable, one at the user's workstation (information outlet) and the other in the floor distribution frame (patch panel). They must operate synchronously. Traditionally, this relies on mobile phones for real-time communication. However, distribution frames are usually small, enclosed spaces filled with metal cabinets, resulting in extremely poor mobile network signal, compromised call quality, and very high communication costs. Another solution is for a single maintenance personnel to run back and forth between the two ends of the cable to relay information. This is not only physically and time-consuming but also highly susceptible to misjudgments due to errors or delays in information transmission.

[0006] Signal crosstalk: Currently widely used analog audio cable finders inject an audio signal at the transmitting end, which is received at the receiving end via a probe and headphones. When multiple cables are tightly bundled together, electromagnetic induction can cause signal "crosstalk" to adjacent cables. Maintenance personnel can only rely on subtle differences in sound loudness heard through headphones to determine which cable is the target cable, or look for the "peak point" of the sound as the probe moves. This method is highly dependent on the operator's hearing and experience. In noisy wiring closet environments, background noise can severely interfere with judgment, easily leading to misjudgment and incorrect port selection. Once the wrong port is connected at the patch panel end, subsequent troubleshooting becomes much more difficult and may even affect other normal lines.

[0007] 3. Delays in functional verification and switching to secondary tools: After tracing and punching the cable, maintenance personnel need to use a third tool—a regular telephone—to connect to both the user port and the patch panel port to perform dial-up tests to verify whether the line's voice communication function is normal.

[0008] This constitutes a separate, delayed verification step. If the test fails, maintenance personnel need to go back to the previous steps, using a cable finder and tester to locate the fault. The process forms a closed loop but is inefficient. This "problem discovery - backtracking investigation" model disrupts the continuity of work and prolongs the troubleshooting time.

[0009] 4. The challenges of personnel skill dependence and standardization: The aforementioned traditional processes heavily rely on the personal experience of maintenance personnel, especially their ability to pinpoint the location of signals when dealing with crosstalk. This results in lengthy training cycles for employees and significant differences in work quality and efficiency among different personnel, hindering the standardization of work processes and quality management.

[0010] In summary, existing technologies suffer from four major pain points: numerous tools, difficulty in collaboration, low accuracy, and slow verification.

[0011] To address the above problems, this invention provides an interactive two-way line tracking and intercom testing system.

[0012] A search revealed no prior art patents that are identical or similar to this invention. Summary of the Invention

[0013] To address the shortcomings of existing technologies, this invention proposes an interactive dual-end line tracing and intercom testing system that integrates line finding, testing, and intercom functions. It is an integrated intelligent testing terminal that enables intelligent collaboration between both ends, precise positioning, and a closed-loop process, thereby fundamentally improving the modernization level of communication line deployment and maintenance.

[0014] The above-mentioned objective of this invention is achieved through the following technical solution: An interactive two-way line tracing and intercom testing system includes: a main test terminal and a remote line-finding slave terminal; the main test terminal is used by maintenance personnel to hold and operate, activate the "line-finding mode" and send a digitally encoded signal; the remote line-finding slave terminal is used to scan on the patch panel after receiving the digitally encoded signal, and when the correct signal is detected, it sends a "line-finding successful" signal.

[0015] Furthermore, the main test terminal includes: The main control module is used for mode control, signal processing, logic judgment, and data communication of the entire device.

[0016] The signal generation and encoding module is used to generate a unique and easily identifiable digital coded electrical signal according to the instructions of the main control module in "line-finding mode"; the digital coded electrical signal includes device ID and serial number information; The display unit is used to display interactive information; The input unit includes function keys and a numeric keypad, used to complete the dialing test function; Voice codec and call module: Used for full-duplex digital voice communication with slave devices in "talkie mode".

[0017] Moreover, the electrical signal is a composite signal that has been digitally encoded.

[0018] Furthermore, the voice codec and call module integrates a voice codec and an audio amplifier, and has a built-in speaker and microphone.

[0019] Furthermore, the main test terminal also includes: a first communication interface for connecting to the telephone or network port of the user's workstation to achieve physical and electrical connection with the horizontal cabling system; and a first power supply module for supplying power to each module of the device.

[0020] Furthermore, the remote wire-finding slave end includes: The slave control module is used for signal processing, identification, and response at the slave end.

[0021] The signal detection and decoding module has a high-sensitivity induction probe at the front end, which is used for non-contact or contact detection of electrical signals on cables or ports; and a filtering and decoding circuit at the back end, which can accurately identify and demodulate the unique coded signal of the autonomous test terminal from complex background noise and crosstalk signals.

[0022] The status indicator unit includes a multi-color LED indicator and a piezoelectric buzzer; when a target signal is detected, it generates a strong audible and visual alert. The slave display unit is used to directly display the detected target port number; The second communication interface is used to insert into the patch panel port that has been punched after successful wire finding, so that it can be used as a "sub-unit" to establish a communication link with the main test terminal.

[0023] The second power module is used to supply power to the remote wire-finding slave end.

[0024] Furthermore, the remote line-finding slave end also includes an intercom auxiliary module with a built-in miniature microphone and speaker, enabling it to be used as an independent extension phone in intercom mode.

[0025] An interactive two-way line tracking and intercom testing method includes the following steps: Step 1: At the user's workstation, maintenance personnel A connects the main test terminal to the target information socket, powers it on, and selects "line search mode".

[0026] Step 2: The main test terminal injects a unique digital coded signal into the connected line through its signal generation and encoding module. This signal is transmitted along the horizontal cabling to the patch panel in the wiring closet.

[0027] Step 3: In the wiring closet, maintenance personnel B holds a remote cable locator in listening mode and places its probe close to or in contact with each port on the patch panel.

[0028] Step 4: When the probe of the slave end moves to the port connected to the target cable, its signal detection and decoding module captures and successfully decodes the encoded signal from the master end; the slave end control module immediately triggers the LED of the status indicator unit to turn green and stay on, the buzzer emits a specific success prompt tone, and at the same time the physical location number of the port on the patch panel is clearly displayed on the slave end display screen.

[0029] Step 5: After the slave end recognizes the signal, it sends a "line search successful" feedback command to the master end through the line; after receiving this command, the master test terminal displays "line search successful" and the corresponding port number on its display screen; Step 6: Maintenance personnel B terminates the line on the corresponding port of the patch panel according to the port number displayed on the slave end.

[0030] Step 7: Maintenance personnel B inserts the remote cable finder into the port where the cable has just been punched; Step 8: After the slave end connects, the master and slave ends communicate via a handshake through the line to confirm that the link is physically connected and the electrical characteristics are normal; the master test terminal automatically switches to "intercom mode" and displays "link connected".

[0031] Step 9: The maintenance personnel at both ends conduct full-duplex, high-definition voice calls through the main test terminal and the remote tracing terminal.

[0032] The advantages and beneficial effects of this invention are as follows: 1. Highly integrated, seamless workflow: The system seamlessly integrates the functions of an audio cable finder, a line tester, and a standard telephone into two separate devices. Maintenance personnel only need to carry one set of this system to complete the entire process from cable tracing to call testing.

[0033] It eliminates the efficiency losses caused by tool switching and process interruptions in traditional operations. The workflow has been transformed from a "serial mode" to a "parallel intelligent mode," with seamless connections between each step, achieving a smooth experience of "one-click line finding, plug and test, and instant intercom," which is expected to save more than 40% of operation time.

[0034] 2. Precise line finding and strong anti-interference capability: By using a unique digital coded signal to replace the traditional single-frequency analog signal, it is like giving the signal a "digital ID card," enabling the receiver to perform intelligent identification and fundamentally solving the problem of misjudgment caused by signal crosstalk.

[0035] The terminal provides clear and unambiguous location information through a three-pronged approach of sound, light, and screen prompts. Maintenance personnel no longer need to rely on subjective auditory judgment; even novices can quickly and accurately locate the target port, increasing the cable finding accuracy to nearly 100% and significantly reducing rework rates.

[0036] 3. Intelligent collaboration, worry-free communication: The system's built-in two-end data interaction function enables the automatic transmission of critical status information such as successful line finding and link readiness between master and slave devices. This is equivalent to establishing an independent and reliable "control channel" between devices, completely eliminating dependence on unstable mobile networks.

[0037] The maintenance personnel at both ends no longer need to run around or argue due to poor communication, making collaborative work easy and efficient. Finally, the intercom function is not only used for testing, but also becomes the most convenient communication tool between them.

[0038] 4. Closed-loop verification ensures controllable quality: It achieves a complete quality closed loop of "discovery (line finding) - construction (line installation) - verification (intercom)". Once the line finding is successful and the installation is completed, the final verification can be completed within 1 minute through the built-in intercom function, and the work results can be confirmed in a timely manner.

[0039] This instant feedback mechanism ensures that problems can be identified and resolved on the spot, avoiding the "testing delay" problem that may occur in traditional processes, and effectively improving the success rate and quality of the first installation / repair.

[0040] 5. Lower the barriers to entry and increase standardization: By reducing reliance on personal listening experience, junior maintenance personnel can achieve similar work efficiency and accuracy to senior personnel after short-term training, thus lowering personnel training costs and skill thresholds.

[0041] This system provides a standardized operating procedure, which helps to promote unified and standardized service quality standards within the enterprise and improve the overall operation and maintenance management level.

[0042] 6. User-friendly design and long battery life: The equipment is designed with on-site conditions in mind, featuring a comfortable grip on the main unit and a lightweight, precise design on the slave unit. Powered by a rechargeable lithium battery, it boasts long battery life, meeting all-weather operation needs. A clear graphical interface and instructions greatly enhance the user experience. Attached Figure Description

[0043] Figure 1 This is a front view of the main test terminal of the present invention; Figure 2 This is a front view of the remote line-finding slave end of the present invention. Detailed Implementation

[0044] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings: This invention provides an interactive dual-end line tracing and intercom testing terminal that integrates multiple discrete tools and steps into an intelligent and coherent system. It solves the most critical and time-consuming pain points in telephone line installation and maintenance, significantly improving the efficiency and quality of the entire telephone communication line deployment and maintenance process. Through high-level hardware integration and intelligent software control, this terminal system seamlessly connects previously discrete processes such as line tracing, termination verification, and voice testing, constructing an intelligent, coherent, and efficient operating system.

[0045] An interactive two-way line tracing and intercom testing system includes: a main test terminal and a remote line-finding slave terminal; the main test terminal is used by maintenance personnel to hold and operate, activate the "line-finding mode" and send a digitally encoded signal; the remote line-finding slave terminal is used to scan on the patch panel after receiving the digitally encoded signal, and when the correct signal is detected, it sends a "line-finding successful" signal.

[0046] In this embodiment, the main test terminal includes: The main control module is used for mode control, signal processing, logic judgment, and data communication of the entire device.

[0047] The signal generation and encoding module is used to generate a unique and easily identifiable digital coded electrical signal according to the instructions of the main control module in "line-finding mode"; the digital coded electrical signal includes device ID and serial number information; The display unit is used to display interactive information; The input unit includes function keys and a numeric keypad, used to complete the dialing test function; Voice codec and call module: Used for full-duplex digital voice communication with slave devices in "talkie mode".

[0048] In this embodiment, the electrical signal is a digitally encoded composite signal.

[0049] In this embodiment, the voice codec and call module integrates a voice codec and an audio amplifier, and has a built-in speaker and microphone.

[0050] In this embodiment, the main test terminal further includes: a first communication interface for connecting to the telephone or network port of the user's workstation to achieve physical and electrical connection with the horizontal cabling system; and a first power supply module for supplying power to each module of the device.

[0051] In this embodiment, the remote wire-finding slave end includes: The slave control module is used for signal processing, identification, and response at the slave end.

[0052] The signal detection and decoding module has a high-sensitivity induction probe at the front end, which is used for non-contact or contact detection of electrical signals on cables or ports; and a filtering and decoding circuit at the back end, which can accurately identify and demodulate the unique coded signal of the autonomous test terminal from complex background noise and crosstalk signals.

[0053] The status indicator unit includes a multi-color LED indicator and a piezoelectric buzzer; when a target signal is detected, it generates a strong audible and visual alert. The slave display unit is used to directly display the detected target port number; The second communication interface is used to insert into the patch panel port that has been punched after successful wire finding, so that it can be used as a "sub-unit" to establish a communication link with the main test terminal.

[0054] The second power module is used to supply power to the remote wire-finding slave end.

[0055] In this embodiment, the remote line-finding slave end also includes: an intercom auxiliary module, which has a built-in miniature microphone and speaker, so that it can be used as an independent extension phone in intercom mode.

[0056] The composition and function of each module in the system of the present invention will be further explained below: An interactive two-way line tracing and intercom testing system is provided, which consists of two portable devices: a main test terminal and a remote line tracing slave terminal, which work together.

[0057] 1. Main test terminal: The main test terminal is designed in the form of a telephone handset or handheld terminal, making it easy for maintenance personnel to hold and operate. Its hardware components include: Main control module: This is the core control unit, which usually uses an embedded microprocessor and is responsible for the mode control, signal processing, logic judgment and data communication of the entire device.

[0058] Signal Generation and Encoding Module: In "Line Search Mode," this module generates a unique and easily identifiable electrical signal according to instructions from the main control module. This signal is preferably a digitally encoded composite signal, rather than a simple single-frequency audio signal. The encoding can include information such as device ID and serial number, making the signal unique and effectively resisting crosstalk.

[0059] Display unit: Uses an LCD screen to display a wealth of interactive information, such as: current working mode (line search, intercom, test), line search progress prompts, successfully found slave location information (such as patch panel port number "B-24"), link connection status, intercom duration, etc.

[0060] Input unit: Includes function keys (such as mode switch key, line start / stop key) and numeric keypad. The numeric keypad retains the dialing test function of a traditional telephone, allowing it to be used as a fully functional test telephone when necessary.

[0061] Voice codec and call module: integrates a voice codec and audio amplifier, with built-in speaker and microphone, enabling full-duplex digital voice communication with the slave device in "talkie mode".

[0062] The first communication interface is usually an RJ11 or RJ45 interface, used to connect to the telephone or network port of the user's workstation to achieve physical and electrical connection with the horizontal cabling system.

[0063] First power module: Powers all modules of the device. It typically uses a rechargeable lithium battery and is equipped with power management circuitry and a charging interface (such as USB Type-C).

[0064] 2. Remote wire finding slave end: The remote cable locator is designed as a pen-type or probe-type structure, compact in size, and easy to operate precisely in dense patch panels. Its hardware components include: Slave control module: Also uses a low-power microprocessor, responsible for signal processing, identification and response at the slave end.

[0065] Signal detection and decoding module: The core functional component. Its front end is a high-sensitivity induction probe used for non-contact or contact detection of electrical signals on cables or ports. The back end is a filtering and decoding circuit, capable of accurately identifying and demodulating the unique coded signal of the autonomous test terminal from complex background noise and crosstalk signals.

[0066] Status indication unit: Includes multi-color LED indicators (e.g., flashing blue light during detection, solid green light upon successful tracing) and a piezoelectric buzzer. When a target signal is detected, a strong audible and visual alert is generated, ensuring that maintenance personnel can immediately detect the signal even in noisy or poorly lit environments.

[0067] Slave display unit: A small display screen (such as an OLED) is used to directly display the detected target port number (such as "B-24"), providing the most intuitive positioning information and avoiding any subjective guesswork.

[0068] The second communication interface is also an RJ11 or RJ45 interface. After successful cable tracing, it can be inserted into the patch panel port that has been punched to establish a communication link with the main test terminal as a "sub-unit".

[0069] Intercom Auxiliary Module: It has a built-in miniature microphone and speaker, which allows it to be used as an independent extension phone in intercom mode.

[0070] Second power module: powered by a small rechargeable battery.

[0071] An interactive two-way line tracking and intercom testing method includes the following steps: Step 1: Initialization and connection. At the user's workstation, maintenance personnel A connects the main test terminal to the target information socket via the RJ11 / RJ45 interface, powers on the terminal, and selects "Cable Search Mode".

[0072] Step 2: Signal transmission. The main test terminal injects a unique digital coded signal into the connected line through its signal generation and encoding module. This signal is transmitted along the horizontal cabling to the patch panel in the wiring closet.

[0073] Step 3: Signal scanning and detection. In the wiring closet, maintenance personnel B holds a remote cable finder in listening mode and places its probe close to or in contact with each port on the patch panel.

[0074] Step 4: Signal Identification and Location. When the probe on the slave end moves to the port connected to the target cable, its signal detection and decoding module captures and successfully decodes the encoded signal from the master end; the slave control module immediately triggers the status indication unit: the LED light turns green and stays on, the buzzer emits a specific success prompt tone, and at the same time, the physical location number of the port on the patch panel (such as "B-24") is clearly displayed on the slave display screen.

[0075] Step 5: Successful Feedback. After the slave device identifies the signal, it sends a "line search successful" feedback command to the master device via the line. Upon receiving this command, the master test terminal displays "line search successful" and the corresponding port number on its screen, allowing maintenance personnel A, located at the user's workstation, to be aware of the progress simultaneously.

[0076] Step 6: Punch-in operation. Maintenance personnel B, based on the port number "B-24" displayed on the slave end, uses a punch-in tool to accurately terminate the line at that port on the patch panel.

[0077] Step 7: Access from the slave end. Maintenance personnel B connects the remote cable-finding slave end (whose role is now changed to an extension) to the port "B-24" that was just completed with the cable through its RJ11 / RJ45 interface.

[0078] Step 8: Link Establishment and Mode Switching. After the slave end connects, the master and slave ends communicate via a handshake to confirm that the link is physically connected and its electrical characteristics are normal. The master test terminal automatically (or after user confirmation) switches to "intercom mode" and displays "Link Connected".

[0079] Step 9: Functional Verification and Collaborative Intercom. Maintenance personnel at both ends can conduct full-duplex, high-definition voice calls via their main test terminal and the remotely located slave end without any additional equipment. They can verify the sound quality to each other and complete the final line function verification. Simultaneously, this channel provides a convenient communication method for subsequent collaborative work.

[0080] The workflow of this invention is as follows: Figure 1 The main test terminal is shown in the front view. The display screen shows the operation mode, line finding process, port number found, etc. The numeric keypad retains the traditional telephone dialing test function. The RJ45 plug is connected to the telephone port of the user's workstation. Figure 2 For remote cable tracing, the probe tip is used to detect signals on the patch panel port in the front view. The following steps outline the workflow for a combined master and slave application scenario: 1. Maintenance personnel A (at workstation): Connect to the main terminal at the workstation port and start "caught mode".

[0081] 2. Main test terminal - horizontal link: Sends unique digitally encoded signals.

[0082] 3. Horizontal Link - Remote Tracking Slave End: The signal propagates along the line.

[0083] 4. Maintenance personnel B (in the wiring workshop): Use the slave probe to scan the patch panel.

[0084] 5. Remote cable finding slave end: When a correct signal is detected, an audible and visual prompt is issued, and the port number (e.g., B-24) is displayed on the screen.

[0085] 6. Remote wire finding slave end - master test terminal: Send "wire finding successful" signal.

[0086] 7. Maintenance personnel B: According to the displayed port number, complete the wiring on port B-24 of the patch panel.

[0087] 8. Maintenance personnel B: Insert the remote connection slave end (which is now an extension) into port B-24.

[0088] 9. Remote connection finding slave end - master test terminal: Send "link ready" signal.

[0089] 10. Main test terminal: Displays "Link connected" and enters intercom mode.

[0090] 11. Maintenance Personnel A <- Maintenance Personnel B: Conduct a full-duplex voice call through the main terminal and the slave terminal to test the sound quality.

[0091] This interactive dual-end line tracing and intercom testing terminal integrates multiple discrete tools and steps into an intelligent, coherent system with a closed-loop process and timely verification. Line tracing, connection testing, and verification achieve a closed loop of "discovery-construction-verification," promptly confirming work results and improving the efficiency and quality of the entire telephone communication line deployment and maintenance work.

[0092] It should be emphasized that the embodiments described in this invention are illustrative rather than limiting. Therefore, this invention includes, but is not limited to, the embodiments described in the specific implementation. Any other implementations derived by those skilled in the art based on the technical solutions of this invention are also within the scope of protection of this invention.

Claims

1. An interactive two-wire line trace and talkback test system, characterized by: Comprise: A main test terminal and a remote tracing slave terminal; The main test terminal is used for operation and maintenance personnel to hold and operate, start the "tracing mode" and send a digital coded signal; the remote tracing slave terminal is used for scanning on the distribution frame after receiving the digital coded signal, and sending a "tracing success" signal when detecting the correct signal.

2. The interactive two-wire loop trace and talkback test system of claim 1, wherein: The main test terminal comprises: A main control module for mode control, signal processing, logical judgment and data communication of the whole device; A signal generation and coding module for generating a unique and easily identifiable digital coded electrical signal under the "tracing mode" according to the instruction of the main control module; the digital coded electrical signal comprises the information of device ID and serial number; A display unit for displaying interactive information; An input unit comprising function keys and a digital keyboard for completing dialing test functions; A voice codec and call module for full-duplex digital voice communication with the slave terminal under the "intercom mode".

3. The interactive two-wire loop trace and talkback test system of claim 2, wherein: The electrical signal is a digitally coded composite signal.

4. The interactive two-wire loop trace and talkback test system of claim 2, wherein: The voice codec and call module integrates a voice codec and an audio amplifier, and is internally provided with a loudspeaker and a microphone.

5. The interactive two-wire loop trace and talkback test system of claim 1, wherein: The main test terminal further comprises: a first communication interface for connecting to a telephone or a network port of a user station to realize physical and electrical connection with the horizontal wiring system; and a first power module for supplying power to each module of the device.

6. The interactive two-wire loop trace and talkback test system of claim 1, wherein: The remote tracing slave terminal comprises: A slave control module for signal processing, identification and response of the slave terminal; A signal detection and decoding module, the front end of which is a high-sensitivity sensing probe for non-contact or contact detection of electrical signals on cables or ports, and the rear end of which is a filtering and decoding circuit capable of accurately identifying and demodulating the unique coded signal from the main test terminal from complex background noise and crosstalk signals; A state indication unit comprising a multi-color LED indicator and a piezoelectric buzzer; when the target signal is detected, a strong sound and light prompt is generated; A slave display unit for directly displaying the detected target port number; A second communication interface for, after tracing success, being inserted into the port of the wired distribution frame to make it serve as an extension and establish a communication link with the main test terminal; A second power module for supplying power to the remote tracing slave terminal.

7. The interactive two-wire loop trace and talkback test system of claim 1, wherein: The remote tracing slave terminal further comprises: an intercom auxiliary module internally provided with a miniature microphone and a loudspeaker, so that it can be used as an independent extension telephone in the intercom mode.

8. An interactive two-wire line trace and talkback test method, characterized by: The method comprises the following steps: Step 1: operation and maintenance personnel A connects the main test terminal to the target information socket at the user station, powers on and selects the "tracing mode"; Step 2: the main test terminal injects a unique digital coded signal into the connected line through its signal generation and coding module, and the signal is transmitted along the horizontal wiring to the distribution frame in the distribution room; Step 3: operation and maintenance personnel B holds the remote tracing slave terminal in a listening state in the distribution room, and sticks or contacts the probe of the remote tracing slave terminal to each port on the distribution frame; Step 4: When the probe of the slave terminal moves to the port connected by the target cable, the signal detection and decoding module of the slave terminal captures and successfully decodes the encoded signal from the master terminal; the state indication unit of the slave terminal immediately triggers the LED lamp to become green constant and the buzzer to emit a specific successful prompt sound, while the slave terminal display clearly displays the physical location number of the port on the patch panel; Step 5: After identifying the signal, the slave terminal sends a "successful line searching" feedback instruction to the master terminal through the line; after receiving the instruction, the master terminal displays "successful line searching" and the corresponding port number on the display screen; Step 6: According to the port number displayed by the slave terminal, the operation and maintenance personnel B completes the line termination at the port of the patch panel; Step 7: The operation and maintenance personnel B inserts the remote line searching slave terminal into the port where the line is just completed; Step 8: After the slave terminal is connected, the master and slave terminals communicate through the line to confirm that the link is physically connected and the electrical characteristics are normal; the master terminal automatically switches to "intercom mode" and displays "link connected"; Step 9: The operation and maintenance personnel of both ends communicate through the master terminal and the remote line searching slave terminal in full-duplex and high-definition voice.

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