4b/5b编解码对100BASE-TX以太网安全性的影响  

Effect upon 100BASE-TX Ethernet Reliability Caused by 4b/5b Coding

作　　者：杨福宇 

机构地区：[1]重庆工业自动化仪表研究所,重庆401123

出　　处：《单片机与嵌入式系统应用》2013年第9期8-11,共4页Microcontrollers & Embedded Systems

摘　　要：将办公室用的以太网用到工业现场,可以降低硬件开发成本,减少人们的学习成本以及后续的维修支持成本,所以出现了各种工业以太网方案,许多已成为国际标准。随着对功能安全要求更加重视,需要对这种现成技术进行新的审视。本文对用于100M以太网物理层的编码进行了分析,发现在信道传送中的位错数目会被此类编码解码过程放大,从而使MAC帧的CRC检验能力大为削弱,即使是"安全"协议附加的CRC检验也没有达到要求。Applying the office communication protocol of Ethernet to the field would reduce the cost of hardware~ invest of the education and cost of service. So there are many industrial Ethernet protocols. Some of them were approved as international standards. There is a tendency to focus the functional safety, hence the scrutiny of available technologies is needed. This paper shows that the coding in 100M Ethernet will cause the error number in channel be amplified that makes the CRC check less effective. Even the supplemented CRC check in so called ＂safety protocol＂ is also not enough.

关 键 词：工业以太网 4b 5b编码 8b 10b编码 错帧漏检 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]