GPON承载E1业务GEM帧封装的FPGA设计实现

GPON is a new broadband access technology. It is designed to support the entire operations (voice, data and video). Its advantages embodied in broad bandwidth capacity, security, manageability and low cost. Downstream 2.4Gb/s, upstream 1.2Gb/s transmission speed bring the network bandwidth efficient acceleration to broadband operators. GPON supports TDM, Ethernet, ATM and other types of business advice. The telecommunications operators favor the business of TDM carried by GPON, which will be one of next generation optical access technologies. The task of this article is GEM encapsulation of E1 service in GPON. This paper is divided into four parts. The first part briefly introduces GPON technology features and analyzes the necessary of TDM business carried by GPON. The second part chiefly introduces the architecture of GPON and the overall design considerations. The third part is the core of the paper, which details the design needs of GEM encapsulation of E1 service and the design of various functional modules. The modules contain frame-head check module, serial-to-parallel change module, FIFO module, counter module, parallel-to-serial module and so on. The four part is summary.