本文提出了一种估计多级互连网在多速率业务环境下的阻塞率的方法。它可用在多速率线路交换和ATM交换系统中。文中首先给出了分析方法,并用计算机仿真验证了分析模型。然后对影响阻塞率的因素进行了分析。研究表明,交换模块的大小和业务的带宽对阻塞率影响极大。同时与无阻塞交换相比,有阻塞交换结构可大大降低系统的复杂性。 This paper presents a method to estimate the blocking rate of multi-level Internet in multi-rate service environment. It can be used in multi-rate line switching and ATM switching systems. The article first gives the analysis method, and verifies the analysis model by computer simulation. Then the factors that affect the blocking rate are analyzed. Research shows that the size of the switching module and the bandwidth of the service have a great impact on the blocking rate. At the same time compared with non-blocking switching, blocking the exchange structure can greatly reduce the system complexity.