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分析了既有丢失优先级又有服务优先级的信道成组ＡＴＭ交换系统的性能。在ＡＴＭ交换中，各种业务分别有不同的服务质量要求。提出了用部分缓冲共享方案给予丢失率要求高的业务以较多缓冲空间，同时引入高、低优先级队列，使时延要求高的业务先得到服务。用一个二维Ｍａｒｋｏｖ链（ｑＶ，ｑＤ）来描述交换系统状态，用ＧａｕｓＳｉｅｄｅｌ迭代法求解系统稳态方程。研究了缓冲阈值、业务量及信道成组技术对系统性能的影响。模拟结果与理论分析吻合。
The performance of group ATM switching system with lost priority and service priority is analyzed. In the ATM exchange, various services have different quality of service requirements. The partial buffer sharing scheme is proposed to give more services with high loss rate and more buffer space. At the same time, high and low priority queues are introduced so that services with high delay requirements are served first. A two-dimensional Markov chain (qV, qD) is used to describe the state of the exchange system and the Gaus-Siedel iteration method to solve the system steady-state equation. The impact of buffer threshold, traffic volume and channel grouping technology on system performance is studied. The simulation results are in good agreement with the theoretical analysis.