SDH信号中的ATM信元实时检测算法

Real-time detection algorithm of ATM cell in the SDH signal

HEC段信息同整个ATM信头有关,利用8位循环冗余编码方式(CRC校验码)产生,用于单比特纠错和多比特查错。针对国内外广泛使用的SDH网络,利用HEC段功能进行SDH帧数据中ATM信元的识别,为SDH网络中ATM信元协议分析和重组的奠定基础。由于信元识别是基于信元本身的差错控制字段,所以能有效地提高识别性能,降低最大信元丢失率。

The Header Error Control （HEC） covers the entire cell header of ATM. The code which generation is based on the property of Cyclic Redundancy Check-8 （CRC-8） used for this function is capable of either single bit error correction, or multiple bit error detection. Aimed at the SDH network applied widely at home and abroad, distinguishing the ATM cell from the SDH signal using the function of the HEC field is the foundation of the ATM cell protocol analysis and reassembly in the SDH network. Because of the cell identification is base on it sells HEC filed, it has great improve the capability of identification and reduce the Maximum Cell Loss Ratio （MCLR）.