Safety Analysis And Solutions Of Local Transmission Network

Optical fiber communication because of its own with a large capacity, high-quality, long-range, anti-interference, high stability, anti-corrosion characteristics, has been developing rapidly. Transmission times across the network from cable to fiber optic communications era. In today's society, with the customer changes the subject, whether it is party and government agencies, banks, large and medium enterprises is still a big ISP, once they rented cable operators would require a 24-hour free from obstruction. The event of failure, but can not be timely repair damage caused to customers, it could face a lot of complaints and claims. Pairs of network maintenance sector, which faces pressure from customers, while the higher authorities to face increasingly stringent assessment indicators. So what kind of measures can ensure the smooth flow of the network has become the current operators are facing a major issue.Trunk-line to achieve non-blocking communications, first thing to consider is to have alternate cable route. This took place in the main break with the cable route, you can manually or automatically switch the way, to resume operations. Manual switching with a slow and prone to misuse and other characteristics, can not meet the requirements. Therefore, the availability of alternate cable routing section, we must consider the protection of automatic switching mode, which automatically switch to protect mode should have a high degree of safety, switching speed, high reliability, while also in the current network basis, does not damage the network structure can not be a large-scale replacement of equipment.Since the author reasons of work, this paper will focus on the transmission line network, especially on trunk transmission networks and metro transport network security, focusing on the automatic switching through the optical fiber transmission network protection system to improve safety performance.Authors hope that through this issue in-depth analysis of local transmission line network, security factors, combined with the actual concrete proposal to resolve this problem, thus greatly improving the safety performance of transport networks, effectively protect the network running, doing customer services.1. This paper analyzes the security of transmission networkThe local transmission network composed of three basic elements: the network structure, transmission equipment, fiber optic lines, that the current transmission network to large-scale optical SDH transmission network as the main body. On the current mobile transmission network carrying business situation, the mobile networks have centralized features. This paper describes the classification principles of mobile transmission networks, through which the principles of the transmission network has been divided for different networks using different way of protecting the registration. This paper analyzes the local transmission network is currently facing the grim situation, and proposed to improve security measures: automatic protection switching system using optical fiber.2. Optical automatic switching systemAutomatic protection switching system for optical fiber communications network a major optical fiber routing security protection to provide a economical and practical solution that can form a non-blocking, high reliability, high flexibility, anti-disaster ability of the optical communications network. Optical automatic protection switching system consists of automatic switching station and network management centers, can achieve optical automatic protection switching, optical power standby fiber optical real-time monitoring and emergency dispatch functions. This paper describes the system's principles and its three main functions available.(1) The basic principles of Automatic switching protection system optical fiber switching module is a light switch control, optical power monitoring, stable light source for monitoring in one highly integrated modules, according to theory can be divided into MCU control circuit, optical power monitoring circuit, optical path switching circuit, the test light circuit. Automatically switched optical trunk transmission system protection equipment when involved in no way affect the transmission characteristics.(2) real-time monitoring standby fiberThe main fiber switching to the spare fiber blocking devices, the switching device itself is capable of real-time monitoring of the main fiber. Return to normal when the main fiber, the device can be based on back-cut parameters to automatically cut back to the main routes used.(3) Equipment Protection ProgramAutomatic protection switching time of less than 50 milliseconds, to reach operational self-healing of the transmission system level of protection. Handover performance configuration parameters are two: switching threshold and switching latency in the network management center can be arbitrarily set, and downloading to the remote device.3. Solutions ResearchThe design solution is the guiding ideology: from the reality of current network, effectively providing practical, reliable, perfect, low-cost technical solutions. Design goals are: to achieve××City Mobile optical fiber cable to protect the local network automation, effectively improve the efficiency of fiber optic cable line maintenance and standards.(1) to ensure uninterrupted communication lines to meet the line maintenance performance evaluation indicators;(2) flexibility in the optical fiber route, to facilitate line cutover and maintenance;(3) The dynamic transmission resource management system, centralized maintenance and management.Based on the current network practice of the 14 backbone nodes to investigate. According to the need to protect the transmission system, has made specific intervention programs. Local Transmission Network set up a main network management center, a sub-network management center to manage optical switching station equipment. Networking Method for focus group room with DCN network, the rest room light switch equipment and network management centers 2M networking. Network management system can switch performance management, real-time optical power monitoring and management, fault management, the three alarm management functions.To sum up, in recent years, for an optical cable trunk lines, metro lines, the application automatically switched optical protection technologies is to improve non-blocking communications, the best solution is to improve the transmission network security key technologies. The application of this system has greatly enhanced the safety performance of the local transmission network to achieve the set objective of this topic.