用概率生成函数分析简单数据链路协议的帧定界性能

Analyzing the Frame Alignment Performance of Simple Data Link with Probability Generating Function

以帧定界过程中各状态之间的转移时间为指标,分析简单数据链路的帧定界性能.利用概率生成函数和Sitter状态机对简单数据链路协议帧定界性能分析的结果表明,简单数据链路协议在光纤信道中承载变长协议数据单元时有出色的帧定界性能,表现为快速的帧同步和误同步检测能力,可持久地工作于同步状态等.可将简单数据链路协议引入接入网中作为IP接入的成帧技术.

The frame alignment performance of simple data link protocol was analyzed by calculating the mean transition time between those states, which is attained by drawing its Sitter state machine and calculating its probatility generating function. The results show that the frame alignment performance of simple data link protocol is quite well when carrying variable length protocol data unit on optical channel: the transition time taken from search state to synchronous state and the time taken for false synchronous detection is very short, and the transition time taken from synchronous state to search state because of misframe is long. Simple data link protocol can be adopted as a framing technique for IP access networks.