CAJ | 학술논문

为评价 IEEE1394b 总线节点传输速率不匹配时的性能，研究和分析了典型 stack??tree拓扑结构的可靠性，提出在 OPNET 仿真环境中构建1394b 总线异步通信模型的方法。采用层次化建模的理念设计节点模型进行仿真：应用层处理模块负责总线初始化、树标识过程和自标识过程，完成总线的配置；介质访问控制层实现异步仲裁和流入流出报文的处理。通过仿真，得到了1394b 总线利用率、异步仲裁申请次数以及端对端延时等特性。实验结果表明：自然优先级比较高的节点可以率先获得总线使用权，同时节点间的 ETE 平均延时随拓扑距离的增大而增大。仿真结果考虑了节点传输速率不匹配时的情况，实现了1394b 总线的拓扑配置和异步仲裁，扩展了 OPNET 模型库。
위평개 IEEE1394b 총선절점전수속솔불필배시적성능，연구화분석료전형 stack??tree탁복결구적가고성，제출재 OPNET 방진배경중구건1394b 총선이보통신모형적방법。채용층차화건모적이념설계절점모형진행방진：응용층처리모괴부책총선초시화、수표식과정화자표식과정，완성총선적배치；개질방문공제층실현이보중재화류입류출보문적처리。통과방진，득도료1394b 총선이용솔、이보중재신청차수이급단대단연시등특성。실험결과표명：자연우선급비교고적절점가이솔선획득총선사용권，동시절점간적 ETE 평균연시수탁복거리적증대이증대。방진결과고필료절점전수속솔불필배시적정황，실현료1394b 총선적탁복배치화이보중재，확전료 OPNET 모형고。
To evaluate the performance of 1394b bus being unmatchable at node transmission rate,the relia-bility of the typical stack??tree topology is studied and analyzed,and an asynchronous communication model of 1394b bus is put forward in OPNET environment.First,hierarchical model of the node of 1394b is de-signed,and then,bus initialization,tree??identification and self??identification are performed to complete the bus configuration by the processing module of application layer.Media access control layer is responsible for asynchronous arbitration and the process of inflow/outflow message.Finally,the utilization rate of the 1394b bus,the number of asynchronous arbitration and the end??to??end time??delay characteristic can be a-chieved through simulation on OPNET.The experimental results show that the natural priority whose nodes are higher than the others can take the lead in using the bus,and at the same time,the ETE average delay is increased with the increase of topological distance increases between nodes.