摘要
相对于传统以太网,现有的以太网物理信道已发生巨大变化.运营级以太网则对以太网信道提出了更高的要求,在运营级以太网应用环境下,采用适当机制提高以太网信道可靠性是必要的.在IEEE802.3标准帧结构的基础上,提出了一种包含前向纠错(FEC)机制的帧结构,并阐述了基于该帧结构的FEC方法.该方法除实现纠错功能外,还具有检测信道性能并自适应调节FEC配置的机制,使得可以在保障纠错性能的基础上尽可能减少FEC带来的开销.并且使用该方法的以太网接口能够与普通以太网接口互通互联以实现后向兼容.对该方法的性能进行了透彻的分析,证明该方法可行.设计了网络设备实现该FEC方法,并搭建测试拓扑对该方法进行评测,测试结果表明,该方法可以实现预期功能.
Huge change has happened with physical channel of the present Ethernet while compared with that of traditional Ethernet. Carrier Ethernet brings forward higher request to Ethernet physical channel. Under the application environment of carrier Ethernet, it is of necessity to improve the transport performance of the Ethernet physical channel by using a special method. Based on the frame structure defined in IEEE Std 802.3, a kind of frame structure is presented, which comprises FEC （forward error correction） contents and an FEC method is also brought forward. The method includes an error correction function as well as a mechanism of detecting the performance of the physical channel and adaptively adjusting the FEC configuration, so the cost brought by the FEC method can be cut short to the minimum while the error correction performance is guaranteed An Ethernet interface using the FEC method can communicate with an ordinary non FEC Ethernet interface, so the backward compatibility can be reached. Detailed analysis for the performance of the FEC method is given too, and the analysis result proves that the FEC method is feasible. A kind of network device that carries out the method is designed and a test topology is set up to test and verify the method. The test data show that the method has the expected performance.
出处
《计算机研究与发展》
EI
CSCD
北大核心
2009年第2期239-244,共6页
Journal of Computer Research and Development
基金
国家"八六三"高技术研究发展计划基金项目(2003AA121110
2005AA121410)
信息产业部电子创业基金项目~~
关键词
运营级以太网
光信道
前向纠错
自适应
MAC
carrier Ethernet
optical channel
forward error correction
adaptive
MAC
