Research And Application Of Optical Network Integratedtester Based On Embedded System

At present,the network communication and its application in our country have covered almost every household,and the amount of troubleshooting is also very huge.Operator's fault detection technology used to rely on operators to arrange,test and repair manually,which requires a lot of manpower and material costs.It also costs a lot.In the system of operators,there is not a comprehensive and miniaturized fault detection instrument equipment which can be used in the current network equipment fault troubleshooting environment.This topic in order to cater to the operators and network users lack of comprehensive testing methods of copper light user self?developed test terminal,terminal with communication,acquisition,protocol processing,access test,physical layer(light)test,application layer network testing and other functions,both the operation and maintenance of the state currently under the background of light coppercoexist,and is equipped with the intelligent operating system,beautiful interface,practical interface,strong endurance,test function can be free to choose other characteristics,is conducive to on?site operation and maintenance personnel to quickly determine the fault.The innovation of this thesis lies in:1.OLT downlink optical power meter can be accurately tested(commonly used in the user terminal for 1490 nm PON optical power test)2.after the completion of the configuration of the EPON access network will be relatively complex MPCP synchronization,OAM synchronization,LOID certification and other aspects of automatic analysis,and draw the corresponding test conclusions3.can detect EPON SFU,EPON HGU(bridge),ADSL modem access network,can also be connected directly to the EPON optical network dial?up test4.address the network through the gateway to access the network,and provide test functions5.wireless LAN connectivity can be detected6.provide a variety of ways to test network connectivityThe EPON(Ethernet passive optical network)technology has been widely used in China's three major carriers,EPON point to multipoint topology characteristics and uplink time division multiple accessmultiplexing mode,which poses a great challenge to the network operation and maintenance.Based on the characteristics of EPON optical network test,this paper presents a design scheme of EPON optical network test system based on protocol analysis.In this scheme,a new physical access mode is designed to realize the online test of the test system.At the same time,through the analysis and comparison of the EPON protocol frame,the test results can be obtained quickly.At the same time,the abnormal light emitting ONU(optical network unit)seriously affects the normal operation of EPON(Ethernet passive optical network),which has become one of the main faults which endanger the stable operation of EPON.In this paper,based on the analysis of the background and the causes of the failure of the abnormal light emitting ONU fault detection technology,this paper proposes a new anomaly detection method based on the hardware acquisition of ONU.The detection technology is based on the hardware layer,monitoring the link layer of the EPON network,providing an effective solution for the fault maintenance of the abnormal ONU.The purpose of the optical network integrated test instrument is to reduce the pressure of many kinds of test equipments that operators need to carry to detect faults at ordinary times.At the same time,the fault nodes can be found quickly,and the operation and maintenance time can be saved.This also replaces the current use of large?scalecomputer work,changes the concept of operation and maintenance,achieves fault prevention measures,and improves the service quality of operators.