| In the process of rapid development of communication and network technology, the trend of all IP service has become a foregone conclusion. The network is evolving into all IP service from the top down. The service of IP bearer network is evolving into various types from a single internet service. These changes made higher requests on security, reliability and quality of service of transport network. Based on this background, optical transport network(OTN) technology emerged as the times require.Optical transport network technology enhanced the networking ability of transport network. It provides transmission channel for the large particle service, and it can also provide cross-connect of wavelength/sub-wavelength level to the client. The introduction of OAM (operation administration and maintenance), networking protection and point agrregation made optical transport network developing toward a more intelligent direction.Currently the manufacturers of the optical transport network equipment from home and abroad have at least one of the optical cross-connect OTN equipment and the electrical cross-connect OTN equipment. On account of the actuality that the service type that the service card of domestic OTN equipment holds was limited and the interface rate was limited, the project group of the subject came up with the design and implementation of multi-service card of optical transport network equipment.According to the research status of optical transport network and service interface, this thesis introduces some knowledge about the technical characteristics of optical transport network technology, the hierarchical network architecture, the interface and basic information structure, optical transport network module frame structure and so on. Based on the analysis of the design requirements and the architecture of optical transport network equipment, this thesis put forward a design scheme of multi-service card. This paper used the PM5450 chip of PMC company as the core chip of multi-service card. The chip integrates abundant logical protocols, framing and multiplexing resources. This paper designed and realized a multi-service card with five service interfaces and an ethernet management interface.It can support various protocols such as OTN, SDH and ethernet in the same interface through software configuration with using software interface technology. The multi-service card installed two rates of interfeces that four low-speed interfaces of 2.5Gbit/s and a high-speed interface of lOGbit/s, it can achieve a total of 20G bandwidth.The design consists of power supply module, optical module, data processing module, microprocessor (CPU) module, clock module and the FPGA module, it has six modules in total. This thesis has carried on the elaboration to the circuit unit design of optical module, data processing module, clock module. Then it described the software design process based on the hardware circuit. It details the programming specifics of the clock chip initialization. At last the optical interfaces indexes of the multi-service card were measured and it tested the transmission performance index of the multi-service card via setting loopback in the service chip. By analysing of the recording measurement chart, the thesis pointed out the problems in the process of testing and proposed solutions. Afterwards it remains to optimize the design and testing. |
