TWI430617B - Passive Optical Fiber Network Autonomous Monitoring Method and Its System - Google Patents

Description

Passive optical network autonomous monitoring method and system thereof

The invention relates to a passive optical network autonomous monitoring method, in particular to a built-in optical monitoring function module used in a central office device and a remote device, and a passive optical network network management device and a remote data processing device for monitoring The collection and analysis of data to determine whether the passive optical network has network anomalies and abnormal locations, assist network maintenance managers to quickly remove network barriers, and prevent network barriers from happening in advance to achieve passive optical networks. The purpose of the road autonomy monitoring method.

In response to the large demand for communication services triggered by the Internet, various transmission technologies, transmission media and network architectures have been proposed, hoping to meet the user service bandwidth under the premise of most economic benefits. demand. Among them, the passive optical network has the advantages of high frequency, no interference and large coverage, and is the most important access network solution for providing broadband services at present and in the future. The passive optical network is a point-to-multipoint network architecture. A central office device uses a fiber-optic line to connect to the optical splitter near the user end to connect multiple remote devices, which can reduce the network construction and maintenance cost. . Since passive optical networks use optical splitters that consume a lot of optical power, such passive optical components also make it difficult to monitor the network.

For the monitoring of passive optical networks, the conventional methods are mainly based on the optical fiber distribution network of passive optical networks, including:

1. Using the Optical Time Domain Reflectometer (OTDR) monitoring method, because the optical splitter is used in the passive optical network to achieve a point-to-multipoint network architecture, but this also causes optical time domain reflection. On the reflected trajectory of the device, the reflected signals of all the divergent routes are superimposed, and the reflected signals of any divergent routes cannot be identified. In order to solve the problem of identifying the reflected signal, there are the following methods:

(1) The active identification component is installed at the end of the divergent routing of the optical splitter. This requires interaction between the communication network and the control computer installed at the computer terminal, which increases the complexity of the monitoring system and causes interference to the communication network.

(2) Adding the long-distance displacement fiber and the reflective component at the end of the divergent routing of the optical splitter as the identification component. Due to the different lengths of the network routing, there is uncertainty in the actual planning and construction. difficult.

In addition, due to the limitations of the dynamic range of the optical time domain reflector and the Event Dead Zone, the actual monitoring objectives are difficult to achieve.

2. Add passive identification components at the end of the divergent routing of the optical splitter to reflect different monitoring wavelengths on different divergent routes, although using a spectrum analyzer with a control computer to overcome the limitations of the optical time domain reflector, but because of the identification component In order to provide reflection for a specific monitoring light wavelength, a special design is required, high cost will be expected, and the conventional method still requires the insertion of a split-wave multiplexing component in the communication network, which also causes interference to the network construction.

For the detection of optical transmitters and optical transceivers, the following methods are:

1. The optical transceivers at the head end of the fiber-optic cable TV network (HEADEND) and the optical transceivers of the distribution terminal (HUB) are respectively equipped with monitoring transponder components, and the monitoring information is transmitted back using the public telephone network. The monitoring center has mastered whether there are obstacles in the network light transmitter and optical transceiver. However, the overall monitoring system is highly complex and uses the public telephone network to transmit monitoring information, increasing the uncertainty and cost of maintenance.

It can be seen that there are still many shortcomings in the above-mentioned methods of use, which is not a good design, but needs to be improved.

In view of the shortcomings derived from the above-mentioned conventional methods, the inventors of the present invention have improved and innovated, and after years of painstaking research, they finally succeeded in researching and developing the passive monitoring method for passive optical networks.

The object of the present invention is to provide a passive optical network autonomous monitoring method, which utilizes a built-in optical monitoring function module of a central office device and a remote device, and cooperates with a passive optical network network management device and a remote data processing device to monitor The data is collected and analyzed, and the passive optical network has the transmission channel to transmit the monitoring data. The whole monitoring method is completely implemented by using the passive optical network equipment and the remote data processing equipment without additional monitoring. The system provides a stable, reliable and non-external environmental monitoring method to achieve the purpose of passive fiber network autonomous monitoring methods.

The passive optical network autonomous monitoring method for achieving the above object aims to continuously monitor and process and record the transmitted optical power bit of the device by using the built-in optical monitoring function module of the passive optical fiber network. Quasi- and received optical power levels. The passive optical network network management device utilizes the existing transmission channel inside the network, and periodically reads the monitoring data from the central office device and the remote device to establish a user-specific route optical power level reference data and continuously update the user-specific route optical power. Level information. The remote data processing device periodically reads the optical power level reference data and the latest optical power level data according to the user identification code corresponding to the link between the central office device and the remote device, and executes the data. The comparison and analysis process to determine whether the network is abnormal or imminent, and notify the network maintenance manager to carry out the necessary disposal to ensure the quality of the network service.

The passive optical network autonomous monitoring method and system thereof of the present invention will be explained below by way of preferred embodiments. The detailed description above is a detailed description of one of the possible embodiments of the present invention, but the embodiment is not intended to limit the scope of the invention.

The present invention improves the conventional fiber network monitoring method to meet the needs of network service providers for network maintenance management. Please refer to FIG. 1 , which is a schematic diagram of an application architecture of a passive optical network autonomous monitoring method according to the present invention, including a data processing device, a passive optical network network management device 2, a central office device 3, an optical splitter 4, and a remote end. Device 5. The data processing device 1 and the passive optical network network management device 2 are connected to each other through the physical transmission medium between the telecommunication network and the central office device 3 of the passive optical network, so as to access and compare the optical power level monitoring data. Processing with analysis. The passive optical network central office device 3 is connected to the optical splitter 4 by a physical optical fiber line, and each of the divergent points of the optical splitter 4 is connected to the individual passive optical network remote device 5 by a physical optical fiber line.

When the network service provider completes the establishment of the network device for the user of the application service, that is, when the connection between the central office device 3 and the remote device 5 is completed and the normal operation is performed, the optical transmission module 31 of the central office device 3 The optical signal transmission module 53 of the remote device 5 transmits the optical signal to the central office device 3 according to the transmission time period assigned by the central office device 3 The light receiving module 33 is used for signal communication purposes. At the same time, the optical monitoring module 32 of the central office device 3 monitors the optical power level transmitted by the optical transmission module 31 in the device and the optical power level received by the optical receiving module 33, and monitors The data is sent to the data processing and storage module 34 for processing and storing the monitoring data; the optical monitoring module 52 of the remote device 5 will transmit the optical power level and the light receiving mode to the optical transmission module 51 in the device. The optical power level received by the group 53 is monitored, and the monitoring data is sent to the data processing and storage module 54 for processing and storage of the monitoring data. The passive optical network network management device 2 reads the optical power level monitoring data through the telecommunication network to the data processing and storage module 34 of the central office device 3, and also utilizes the internal transmission channel of the passive optical network through the central office device. The data processing and storage module 54 of the remote device 5 reads the optical power level monitoring data and stores it in the database of the network management device 2 to provide a reference for the optical power level reference. The network management device 2 assigns a link number to the link formed by the central office device 3 and each remote device 5 connected thereto, and also associates the link number to the user of the user who provides the service by using the link. The identification code, in the database of the network management device 2, the reference data of the optical power level reference is referred to as the user-specific route optical power level reference data. Thereafter, the network management device 2 will continue to read the latest monitoring data of the optical power level to the central office device 3 and each remote device 5 in a periodic manner, and temporarily store it in the database of the network management device 2, The data is referred to as the current user-specific route optical power level data. The remote data processing device 1 reads the transmitted optical power level data of the current central office device 3 and the remote device 5 according to each user identification code in a regular manner via the network to the network management device 2 of the passive optical network. Receiving optical power level data, and also reading the user-specific route optical power level reference data from the network management device 2 database, and performing comparison and processing analysis of the optical power level reference data and the current optical power level data .

Through the analysis of the read light monitoring data by the data processing device 1, according to Table 1, it can be determined that the following abnormal causes and abnormal positions may occur in the passive optical network, including: degradation of the optical transmission module of the central office equipment, and light of the central office equipment The receiving module is degraded, the optical transmission module of the remote device is degraded, the optical receiving module of the remote device is degraded, the optical transmission module of the central office device is seriously deteriorated or disabled, and the optical receiving module of the central office device is seriously deteriorated or disabled. The optical transmission module of the end equipment is seriously deteriorated or disabled, the optical receiving module of the remote equipment is seriously deteriorated or disabled, the feeder cable section is abnormal (including disconnection), and the Drop cable section is abnormal. (including broken lines) and so on. The data processing device 1 also notifies the maintenance personnel of the network service provider via the network, and simultaneously displays the abnormality of the user name, the cause of the abnormality, and the analysis result information of the location, and provides the basis for the maintenance of the maintenance personnel to perform the necessary equipment. Repair or further reuse the test equipment to the abnormal cable section to confirm the problem location to remove the obstacle.

Table 1: Analysis of monitoring results

Remarks:

1. Reasonable range: the difference between the optical power level and the reference value is ≦0.5dB

2. Abnormal range: 0.5dB<the difference between the optical power level and the reference value ≦3.0dB

3. Severe abnormal range: the difference between the optical power level and the reference value is >3.0dB

The passive optical network autonomous monitoring method provided by the invention has the following advantages when compared with other conventional technologies:

1. The invention is used for the built-in optical monitoring function module of the passive optical fiber network and the remote device, and is monitored by the network device itself, and communicates through the existing transmission channel of the network, and does not need to be in the passive optical network. With the addition of components or equipment, network monitoring purposes can be achieved.

2. The present invention can cover the entire optical field of passive optical networks, and is not limited to monitoring only optical transmission and optical receiving modules or fiber distribution networks.

3. The invention can be used to judge whether a passive optical network has network obstacles, and can also determine whether the network is abnormal or deteriorated, etc., and can provide network service providers with precautions to avoid network obstacles and improve the network. service quality.

4. The invention does not require the use of specially designed components or equipment, reduces the impact on the passive optical network, reduces the complexity of network maintenance, and eliminates additional cost investment.

5. According to the research and analysis data, the invention can know the cause of the abnormality of the passive optical network and the abnormal position, so that unnecessary dispatching can be avoided, and even if it is necessary to dispatch a worker, it is also possible to know in advance which kind of engineering personnel need to be dispatched. Eliminate obstacles to designated locations, which not only saves working hours, but also improves the quality of network services.

The detailed description of the present invention is intended to be illustrative of a preferred embodiment of the invention, and is not intended to limit the scope of the invention. The patent scope of this case.

To sum up, this case is not only innovative in terms of technical thinking, but also has many of the above-mentioned functions that are not in the traditional methods of the past. It has fully complied with the statutory invention patent requirements of novelty and progressiveness, and applied for it according to law. Approved this invention patent application, in order to invent invention, to the sense of virtue.

1. . . Data processing equipment

2. . . Passive fiber network management equipment

3. . . Central office equipment

31. . . Optical transmission module

32. . . Light monitoring module

33. . . Light receiving module

34. . . Data processing and storage module

4. . . Light splitter

5. . . Remote device

51. . . Optical transmission module

52. . . Light monitoring module

53. . . Light receiving module

54. . . Data processing and storage module

1 is a schematic diagram of an application architecture of a passive optical network autonomous monitoring method according to the present invention;

FIG. 2 is a schematic diagram of an application architecture of a built-in optical monitoring function module of a central office device according to the present invention;

FIG. 3 is a schematic diagram of an application architecture of a built-in optical monitoring function module of a remote device according to the present invention.

Claims (4)

A passive optical network autonomous monitoring method includes the following steps: (a) connecting a central office device and at least one remote device of the built-in optical monitoring module, and being in a normal operating state; (b) monitoring the central office The transmitted optical power level and the received optical power level of the device and the remote devices are processed and stored in the central office device and the remote devices; (c) first read by the passive optical network network management device The monitoring data stored in the central office equipment and the remote equipment is configured as a user-specific routing optical power level reference data; (d) the passive optical network network management equipment is periodically read and stored in the central office. The monitoring data in the device and the remote devices are built into the current user-specific routing optical power level data; (e) the comparison analysis of the user-specific routing optical power level reference data and the current data is performed to analyze the network Whether the road is abnormal; and (f) when the network is abnormal, notify the network maintenance manager to perform the necessary disposal. A passive optical network autonomous monitoring system includes: a central office device for continuously monitoring, processing, and storing an optical power level monitoring data; and an optical splitter coupled to the feed through a feeder cable The central office device is configured to establish a plurality of transmission channels; the at least one remote device is coupled to the transmission channels of the optical splitter through at least one drop cable for continuously monitoring, processing, and storing the Optical power level monitoring data; a passive optical network network management device is coupled to the central office equipment through a telecommunication network, and reads optical power level monitoring data to the central office equipment, and also utilizes the central office equipment The passive optical fiber network has a transmission channel inside, and the remote device reads the optical power level monitoring data to establish a user-specific route optical power level reference data and the current user-specific route optical power level data; and a data processing device The passive optical network network management device is coupled to the telecommunication network for reading, comparing, and analyzing the optical power level monitoring data. The passive optical network autonomous monitoring system of claim 2, wherein the central office equipment further comprises: a central optical transmission module, which can continuously transmit optical signals to the remote devices; The module can receive the optical signals transmitted by the remote devices in an intermittent manner; the optical light monitoring module continuously monitors the optical power level of the optical signals transmitted by the optical transceiver module of the central office, and The optical power level of the optical signal received by the optical transceiver module of the central office to form a link end optical power level monitoring data; and a central office data processing and storage module for the central office The optical power level monitoring data is converted from the analog signal to the digital signal, and converted to the world's common optical power level measurement unit, and the processed data is stored. The passive optical network autonomous monitoring system of claim 3, wherein the remote device further comprises: at least one remote optical transmission module, according to a time period allocated by the central office device, during the period The optical signal is transmitted to the central light receiving module; the at least one remote optical receiving module can continuously receive the optical signal of the central optical transmitting module; at least one remote optical monitoring module can continuously monitor the optical signals The optical power level of the optical signal transmitted by the remote optical transmission module and the optical power level of the optical signal received by the remote optical receiving module to form a remote optical power level monitoring of at least one link And at least one remote data processing and storage module for converting the remote optical power level monitoring data from the analog signal to the digital signal, and converting to the world common optical power level measuring unit and the like And store the processed data.