| According to the development of optical communication technology, optical fiber communication has already been the main communication mode in the modern communication transmission. The development of communication technology has been effect by the quality of the optical line. The reasons of breakdown in optical cable line are often the interruption caused by external force, aged equipment, increased attenuation. These faults can cause deterioration slowly even the transmission signal in optical cable interrupt immediately. Therefore we should make great effort to prevent the crises from occurring. The optical cable which are deteriorating slowly should be changed or maintained. And this processing can avoid the service loss or expensive repair and decrease the economic loss which caused by communication interruption. The Automatic Monitoring System of the Optical Cable Lines can realize the distributed, real-time and on-line automatic monitoring for the change of the transmission loss characteristics in optical fiber core and the interdiction of the optical fiber and so on. This system can realize the service and maintenance which can not effect the transmission performance of the optical transmission system. Optical cable monitors the development three stages having passed. The first stages are in 1980's. Fibre-optical applied juat now in large scale at that time , that the problem probabilities appear since being new upper fibre-optical network, was not many. The most optical cable malfunction and hidden trouble are a man-made fault and destroy. Optical cable monitors a technology however the optical cable coming to be in progress depending on brightness to hold machine's having no up after the event report an emergency , adopt portable glossy time domain reflection instrument OTDR or adopt OTDR to make rounds of visit to the technology checking up monitors. Whose main shortcoming is: The TDR wear is very quick. Second stages arrive at 1990's powder in 1980's powder. With at full speed develop and large-scale fibre-optical technology application , optical cable, the malfunction begins to become comparatively outstanding. Fibre-optical has monitored a technology at this time, starting maturity , has adopt real time supervisory control to glorify the dynamometer real time supervisory control + OTDR testing way , has realized. But be short of online , stride over Duan to test an ability. Third stages have arrived at early in the 21 century in 20 ends of the century , world range inner fibre-optical communication and photoelectron estate have entered a new period with the development of entire glossy network equipment and technology, especially now. Owing to that the advanced brightness component and optical signal process the technology entire photo-communication, the network technology has changed network face of entire wire communication completely with equipment. Adopt a wave to be allotted the shortcoming that the multiplex and concentrated wave replaces mark multiplex to waiting for the technology and the OTDR technology to have overcome the first two combining with carrying out supervisory control , its on fibre-optical each other at this time. Optical cable monitors a technology after having experienced this three stages, gradually mature. The optical cable it is the reality making use of third generation optical cable to monitor a technology , being tied in wedlock locality, to have founded self monitors the main body of a book systematically. During the period of the ingredient introducing that optical cable monitors three of system, having combining with their software technological process , let reader have the all-round cognition by introducing the hardware structure checking a centre , checking the station , communications network. Priority module being related to face to face in this key link in monitoring station: Luminous power monitoring a module , up the switch module , the wave mark of multiplex implement module and so on has made detailed introduction. Communications network passes the figure data net , curtate exchange net , 64 K data passage or pay telephone exchange the net tandem but are accomplished. The PC server monitoring centre running the Windows NT network software composes a local area network. Networked equipment adopt the standard network equipment route implement. Be to swear to communicate by letter unimpeded and reliable , build 2 curtate lines for special use (the rate is 64 K) , 3 telephone lines; Every detecting station applies for curtate 1 line for special use (the rate is 64 K) and a telephone line respectively. Design that the password , namely the terminal write down a password and enter the preferential step allocation password in the field of safety , originally having used a two stage. IP address application composes in reply assignment as the average local area network interposes basic.At first this thesis discussed the fundamental knowledge of optical cable and monitoring of optical cable. And then put forward the general design scheme that was based on the actual operation and maintenance situation of optical fiber trunk cable network in Jilin Province. The principle is that the scheme can guarantee the advancement, effectiveness, economy, practicality and feasibility of the system. The general structure consisted of province monitoring center, in-site monitoring and communication network. Furthermore the composition and the function of these three parts were discussed. We understood the on-line monitoring of the whole optical cable further by contrast study of the other on-line monitoring methods. Monitoring centre received the test data which was sent by the monitoring station, the history information in the base was analyzed and treated by the intelligent monitoring centre software, and then the properties of the optical cable faults can be automatic judged and the analysis reports and the analysis chart can be obtained. The received light power in the optical cable line was remote controlled and automatic monitored by the monitoring station. The change of the transmission loss was tracked and the results was reported to the monitoring center by the monitoring station. The monitoring center connected with the monitoring station by Digital Data Transmission Network and Public Telephone Switch Network. The interface in the network was flexible and easy to remote access.At last, the properties of the system were summarized and the outlook of the optical cable on-line monitoring was given in the thesis.Automation optical cable monitors system on line having a lot of deficiency and needing the place improving though having improved the malfunction judgement on very big degree. Optical cable now is reserved in the process of lay down, since existence is magnanimous: Connecting reserving , stretching to meet to reserve and so on. Leading to ultimate measurement result is able to have certain deviation. This is that we will need improvement's next step. Telecommunication networks monitors fixation now since the house stops monitoring to some extent , on line relatively being able to receiving a part to meter. But move telecommunication networks , expand since base stand quantity scatters muchly. Except the main line can monitor the outside,stretch receiving a part being to holding machine's depending on brightness reporting an emergency after the event , to bring maximum to maximum upkeep not going to the lavatory. I believe that the general all solves with development of technology , these problem. |
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