OBS边缘节点接收设备的研究

Research of Receiving Equipment in Edge Node of OBS

光突发交换(OBS)网络边缘节点的接收设备具有与普通光网络接收设备不同的要求和特点。首先,光突发接收要求有快速的信号同步时间,以减少前导字节所占用的开销;其次,特有的帧结构要求有相应的解封装操作和业务数据的快速交换能力。本文设计和测试了光突发接收电路,同时利用大容量FPGA完成了信号的解封装和IP数据的快速交换,并以此开发了OBS边缘节点接收设备,在系统测试中证明该设备符合光突发交换系统的要求。

The receiving equipment in the edge node of OBS had different requirements from normal optical network receiver, burst optical dataflow need to be received in short time for the sake of less preamble code. The quick synchronization process was needed in the data recover circuit. The disassemble process was need because of the special frame of burst data. The fast switching structure was needed for the client payload. The research and test of burst receiving circuit was made. Disassembling and switching functions were realized in a FPGA. The function and performance was tested in the OBS system.