A remote noise monitoring system based on radio and television HFC network

Abstract

The invention discloses a remote noise monitoring system based on a radio and television HFC network. The noise control system unit is used for remote monitoring and controlling a noise monitoring device, and is connected to an integrated network management system unit signal through a data port. The integrated network management system unit is used for managing HFC network data, and is connected to a metropolitan area network unit signal through a data port. The metropolitan area network unit is used for allocating HFC network data, and is connected to an HFC network optical node unit signal through a data port. The HFC network optical node unit is used for converting optical signals and electrical signals, and is connected to an HFC network node unit signal through a data port. The HFC network node unit is used for allocating HFC network electrical signals, and is connected to user-end telecommunications through a data port. A noise monitoring device is used for attenuation control of electrical signals, and is connected to an electrical signal input terminal and an output terminal of the HFC network node unit signal. The noise monitoring device is remotely monitored and controlled so as to locate the noise source and achieve the effect of eliminating noise interference.

Description

Technical Field

[0001] The invention relates to the technical field of radio and television HFC networks, and in particular to a remote noise monitoring system based on a radio and television HFC network. Background Art

[0002] The HFC network structure is a hybrid fiber-coaxial cable network. HFC networks are usually composed of three parts: fiber trunks, coaxial cable branches, and user distribution networks. The program signals from cable TV stations are first converted into optical signals and transmitted on the trunks; after reaching the user area, the optical signals are converted into electrical signals, distributed by distributors, and sent to the user end through coaxial cables.

[0003] In traditional radio and television HFC networks, since the uplink channel uses the 5-65MHz frequency band, various noise interferences are easily generated in the backhaul network, including structural noise from within the network and noise invading from outside the network. These noises seriously affect the quality of signal transmission. The interference spectrum generated by the noise even covers the effective signal spectrum, resulting in an uncorrectable high bit error rate, causing signal transmission distortion and affecting the user's network experience.

[0004] The existing measures to reduce network noise mainly include the following: First, adopt a reasonable layout of the network structure to reduce the number of users carried by the optical nodes in the HFC network. The disadvantage of this method is that the renovation cost of old communities is high. Second, adopt the method of returning high-pass filters at the transmission nodes of the HFC network to isolate the 5-30MHz frequency band and reduce noise aggregation. The disadvantage is that the 30-65M uplink frequency band cannot be filtered and the noise source cannot be fundamentally filtered. Third, the method of using forward error correction technology to improve the network's ability to resist noise interference has the disadvantage that the errors caused by excessive noise interference cannot be corrected. Fourth, the method of improving the quality of HFC network engineering construction has the disadvantage that over time, various connectors will become loose or user terminals will generate noise sources that are difficult to avoid.

[0005] The traditional HFC network monitoring and maintenance method is to conduct testing only when business operations are affected, or to arrange on-duty personnel to conduct on-site testing regularly. However, the continuity of the testing time cannot be guaranteed. In particular, the noise transmitted back from the HFC network transmission nodes is often sudden, making it impossible for maintenance personnel to monitor and determine the noise source in a timely manner. Summary of the invention

[0006] The present invention aims to provide a remote noise monitoring system based on a radio and television HFC network. The noise control system unit can locate the noise source and eliminate noise interference by remotely monitoring and controlling the noise monitoring device.

[0007] The remote noise monitoring system based on the radio and television HFC network described in the present invention comprises a noise control system unit, which is used for remotely monitoring and controlling a noise monitoring device, and is connected to the integrated network management system unit signal through a data port; the integrated network management system unit is used for managing HFC network data, and is connected to the metropolitan area network unit signal through a data port; the metropolitan area network unit is used for allocating HFC network data, and is connected to the HFC network optical node unit signal through a data port; the HFC network optical node unit is used for converting optical signals and electrical signals, and is connected to the HFC network node unit signal through a data port; the HFC network node unit is used for allocating HFC network electrical signals, and is connected to the user end telecommunication through a data port; and the noise monitoring device is used for attenuation control of electrical signals, and is connected to the electrical signal input and output ends of the HFC network node unit signal.

[0008] The remote noise monitoring system based on the radio and television HFC network described in the present invention installs noise monitoring devices at the electrical signal input and output ends of the HFC network node unit. The noise monitoring devices perform attenuation control on the electrical signals at the electrical signal input and output ends of the HFC network node unit, and scans the influence of the spectrum change of the electrical signal input end of the HFC network node unit on the signal-to-noise ratio of the entire HFC network node unit in real time. The spectrum is transmitted to the noise control system unit via the HFC network optical node unit, the metropolitan area network unit, and the integrated network management system unit. The noise control system unit determines the return path of the main noise source step by step, and further locks the noise source, so as to locate the noise source and achieve the effect of eliminating noise interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the principle structure of the present invention;

[0010] Figure 2 It is a connection diagram of the noise monitoring device of the present invention and the HFC network node unit. DETAILED DESCRIPTION

[0011] 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.

[0012] A remote noise monitoring system based on a radio and television HFC network comprises a noise control system unit, which is used for remotely monitoring and controlling a noise monitoring device and is connected to an integrated network management system unit signal through a data port; an integrated network management system unit, which is used for managing HFC network data and is connected to a metropolitan area network unit signal through a data port; a metropolitan area network unit, which is used for allocating HFC network data and is connected to an HFC network optical node unit signal through a data port; an HFC network optical node unit, which is used for converting optical signals and electrical signals and is connected to an HFC network node unit signal through a data port; an HFC network node unit, which is used for allocating HFC network electrical signals and is connected to user-end telecommunications through a data port; and a noise monitoring device, which is used for attenuation control of electrical signals and is connected to electrical signal input and output terminals of the HFC network node unit signal.

[0013] By installing noise monitoring devices at the electrical signal input and output ends of the HFC network node unit, the noise monitoring devices perform attenuation control on the electrical signals at the electrical signal input and output ends of the HFC network node unit, and scan in real time the influence of the spectrum changes of the electrical signal input end of the HFC network node unit on the signal-to-noise ratio of the entire HFC network node unit. The spectrum is transmitted to the noise control system unit via the HFC network optical node unit, the metropolitan area network unit, and the integrated network management system unit. The noise control system unit determines the return path of the main noise source step by step, and further locks the noise source, so as to locate the noise source and achieve the effect of eliminating noise interference.

[0014] like Figure 1 , Figure 2 As shown, the noise control system unit is connected to the integrated network management system unit signal through the data port, the integrated network management system unit signal connection is connected to the metropolitan area network unit signal through the data port, the metropolitan area network unit is respectively connected to the HFC network optical node unit 1, HFC network optical node unit 2, HFC network optical node unit 3, HFC network optical node unit 1, HFC network optical node unit 2, HFC network optical node unit 3 are respectively connected to the HFC network node unit A, HFC network node unit B, HFC network node unit C, HFC network node unit A, HFC network node unit B, HFC network node unit C are respectively connected to the user end A, user end B, user end C, HFC network node unit A, HFC network node unit B, HFC network node unit C are respectively provided with noise monitoring devices, the noise control system unit is used to realize automatic remote monitoring and control of the noise monitoring devices of each node, reduce the human cost investment in noise troubleshooting, improve the efficiency of noise interference elimination, and improve the stability of network quality.

[0015] The noise control system unit is interconnected with the noise monitoring device through a server or a client, so as to realize automatic remote monitoring and control of the noise monitoring device of each node.

[0016] The HFC network optical node unit includes an optical transmitter, an optical receiver and a reverse optical receiver. The HFC network node unit is a bidirectional amplifier or a floor splitter. The noise monitoring device includes a CM module and a control module. The CM module is connected to the reverse signal output terminal. The control module is connected to the control switch of the user signal input terminal and the electrical signal input terminal of the HFC network node unit. The signal connection between the CM module and the reverse signal output terminal signal connection includes an AC power supply and a CM level signal connection. The noise control system unit remotely controls the control module on the noise monitoring device to close the control switch, increase the uplink level attenuation signal of the electrical signal input terminal of the HFC network node unit, and achieve the purpose of suppressing the noise source. The AC power supply provides working power for the noise monitoring device. A test port is set at the reverse signal output terminal. The test signal of the test port of the reverse signal output terminal of the bidirectional amplifier or the floor splitter is transmitted to the integrated network management system unit through the CM module, the optical receiver, the reverse optical receiver, the server or the client after being monitored by the noise device. The noise control system unit determines the return path of the main noise source step by step, and further locks the noise source. The noise control system unit can also obtain the real-time signal-to-noise ratio value of each node on the integrated network management system unit.

[0017] The noise monitoring device also controls the level signal attenuation of each branch, thereby affecting the change of the return noise spectrum of each HFC network optical node unit, and obtaining the latest real-time results of the signal-to-noise ratio. The noise control system unit compares the change of the signal-to-noise ratio before and after the control to determine whether there is a noise source on the road. In the case of noise interference at night, it can be eliminated more effectively, shortening the fault recovery time and improving the network experience quality of the user end.

[0018] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A remote noise monitoring system based on radio and television HFC network, characterized in that: It includes a noise control system unit, which is used for remote monitoring and control of the noise monitoring device and is connected to the integrated network management system unit through a data port; Integrated network management system unit, used to manage HFC network data and connect with metropolitan area network unit signals through data ports; Metropolitan area network unit, used to distribute HFC network data and connect with HFC network optical node unit signals through data ports; HFC network optical node unit, used for converting optical signals and electrical signals, and connected with HFC network node unit signals through data ports; HFC network node unit, used to distribute HFC network electrical signals and connect to user-end telecommunications through data ports; A noise monitoring device is used to perform attenuation control on the electrical signal and is signal-connected to the electrical signal input and output terminals of the HFC network node unit; the noise monitoring device comprises a CM module and a control module, the CM module is signal-connected to the reverse signal output terminal, and the control module is respectively connected to the user signal input terminal and the control switch of the electrical signal input terminal of the HFC network node unit in telecommunication; The noise control system unit and the noise monitoring device are interconnected via a server or a client.

2. A remote noise monitoring system based on a radio and television HFC network according to claim 1, characterized in that: The electrical signal output end of the HFC network node unit includes a user signal input end and a reverse signal output end.

3. A remote noise monitoring system based on a radio and television HFC network according to claim 2, characterized in that: The user signal input terminal and the electrical signal input terminal of the HFC network node unit are both provided with a control switch connected to the noise monitoring device.

4. A remote noise monitoring system based on a radio and television HFC network according to claim 2, characterized in that: The signal at the reverse signal output end is transmitted via the HFC network optical node unit, the metropolitan area network unit, the integrated network management system unit, and the noise control system unit.

5. The remote noise monitoring system based on the radio and television HFC network according to claim 2 is characterized in that: The reverse signal output end is provided with a test port.

6. The remote noise monitoring system based on the radio and television HFC network according to claim 1 is characterized in that: The signal connection between the CM module and the reverse signal output terminal signal connection includes an AC power supply and a CM level signal connection.

7. The remote noise monitoring system based on the radio and television HFC network according to claim 1 is characterized in that: The HFC network node unit is a bidirectional amplifier or a floor brancher.

8. The remote noise monitoring system based on the radio and television HFC network according to claim 1 is characterized in that: The HFC network optical node unit comprises an optical transmitter, an optical receiver and a reverse optical receiver.

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