Cable Automatic Monitoring System – cable, automatic monitoring – Communications Industry
Abstract As the fiber Communicate Wide applications, operators Cable Maintenance and management have put forward higher requirements.
This article describes the optical fiber line automatic monitoring system of the composition of the principle of its application.
1, application background According to statistics, the total length of fiber optic cable have been laid over the 4.05 × 106km, about 7.582 × 107 km core, while the microwave line length is only 2 × 105km, and the transmission capacity is far lower than the fiber-optic cables, can be seen China's information capacity of more than 90% is transmitted through the cable line.
With the increase in the number of fiber optic cable and early aging of cable laying, cable fault line number is increasing. Traditional cable line maintenance management troubleshooting problems troubleshooting long time and affected the normal work of communication networks, each of communication cable fault caused huge economic losses. How to more efficient maintenance and management of the cable's problem has become acute.
To China Mobile Companies in the province province Route from June 2005 to June 2006 during the line fault (including cable and line blocking degradation), for example, statistical case as shown in Table 1.
Table 1 statistical situation Although the existing ring protection technology to some extent will continue to ensure the smooth flow of business, but you can see, as line maintenance is still the traditional way of maintenance repairs, to restore lasting than those of line fault long, of a business failure risks remain.
The implementation of real-time monitoring of fiber optic cable lines and management, dynamic observation of the deterioration of transmission performance of optical cable lines, and timely detection and prediction of cable hidden in order to reduce the incidence of blocked cable, cable fault duration shortening is crucial.
2, the application of optical fiber line monitoring system
Fiber line automatic monitoring system is Telecommunications Management Network (TMN) in the transmission network management domain, a subnet is the last obstacles blocking the effective compression and all fiber optic cable line to detect hidden dangers of the important technical means. It uses Computer Technology, optical fiber communication measurement techniques, the quality of the cable line, running, etc. automatic, real-time Monitor And Test .
Different objects of the monitoring, the monitoring system is divided into two general categories: metal sheath of the cable insulation on the ground Resistance Testing and optical backscattering coefficient of the test, the former also known as cable sheathing-to-ground insulation monitoring system, which automated monitoring system, said optical fiber.
2.1 Fiber optic cable-to-ground insulation resistance monitoring system automatically
Is the core of optical fiber Fiber Beam, optical beam is aluminum outer casing, the outer layer is a plastic outer sheath. Most long-haul fiber optic cable buried in the ground, outer sheath damage is inevitable for various reasons, affect communication quality. Soil moisture intrusion cable, and then affect the communication fiber damage. Cable damaged by the cable outer sheath of aluminum casing on the earth to measure the drop of insulation resistance. Per kilometer of fiber optic cable on the ground as insulation resistance of not less than 2M , maintenance personnel to determine this on a regular basis, sub-meter test cables with high resistance to ground resistance. Although traditional detection methods spend a lot of time to find broken points, but accuracy is not high. Fiber optic cable insulation resistance to ground automatic monitoring system can automatically monitor the status of cable resistance on the ground, saving troubleshooting time, greatly improve the efficiency of maintenance of fiber optic cable.
Advantage of the system can be affected when the quality of outer sheath to provide injury early warning, timely repair of damaged fiber optic cable; automatic data collection; system equipment relatively simple (compared with fiber-optic monitoring); provide quantitative the fault location signal, reducing barriers to last.
But the system application, there is the following disadvantages.
(1) because the domestic construction of buried fiber optic cable, the metal outer sheath insulation resistance on the ground there are more problems, but the system requirements before installing insulation resistance to ground must meet the requirements, pre- transformation of the heavy workload;
(2) before the station installed Sensor Must open the connection boxes that have been opened in terms of circuit lines, large risk;
(3) As the system uses fiber optic cable buried metallic outer sheath and the earth to form the loop testing and data transmission, does not apply to aerial cable lines.
The above analysis, since there is an urgent need for application of optical fiber line automatic monitoring system of lines forming have been building and transforming major difficulties, so cable sheath insulation resistance to ground the feasibility of applying automatic monitoring system for less.
2.2 Fiber Automatic Monitoring System
Automatic monitoring system is to use optical fiber to the scattering curve after the test to achieve remote automatic monitoring of cable lines. Has been applied to some cable operators on the route. Torsion of the optical fiber monitoring system, is optical fiber monitoring system.
Automatic monitoring system consists of optical fiber monitoring centers and stations (MS) component. Monitoring center can be divided into the total Monitoring Centre (GMC), Provincial Monitoring Center (PMC), the Regional Monitoring Centre (DMC) 3 grades.
System works is intercepted by the device of splitting Road Optical transmission Network Collection, letter side of the light for optical power measurements, the optical power value obtained qualitatively explain the status of cable lines and fault phenomena in which, once identified by the cable failure, the monitoring system will automatically start OTDR, docking in the light switch on The fiber line fault test, find the point of failure. Schematic shown in Figure 1.
Figure 1 Fiber Automatic Monitoring System Diagram
According to different needs, on-site monitoring stations can realize online monitoring, equipment monitoring fiber cross-section monitoring of three kinds of test methods.
Fiber optic monitoring system in recent years the application of automatic and continuous improvement of sound, has become trunk cable dimension Care Workers Fault location as an important means to safeguard the country's telecommunications network has played a huge role, but due to technical and other reasons, the present system itself there are still some deficiencies.
2.2.1 Alarm Signals Present, optical fiber monitoring system alarm information extraction are basically 3 ways: use of splitter 3% of the light extraction through the AIU, ACU analysis; use of the equipment rack alarm signal; use of equipment relay CD Matt income alarm signal.
3 ways but there are some limitations
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