摘 要
本文简单介绍了异步传送模式（ATM网）以及异步传送模式中的四种业务模型：恒定比特率业务模型CBR、实时可变比特率业务模型rt-VBR和非实时可变比特率业务模型nrt-VBR、可用比特率业务模型ABR以及未定义比特率业务模型UBR，其中详细分析并讨论了非实时的可变比特率Nrt-VBR(Non-Real-Time Variable Bit Rate)和可用比特率ABR(Avail- able Bit Rate)两种业务模型，并使用MATLAB语言对这两种模型进行简单仿真，用仿真结果对这两种模型进行性能评价以阐明业务模型的基本特点。
关键词： ATM网；VBR业务；nrt-VBR业务；ABR业务；MATLAB语言
Traffic Models in Broadband Networks
Abstract
In this paper, ATM and four kinds of traffic models, constant bit rate (CBR) and real-time variable bit rate (VBR), none-real-time variable bit rate (nrt-VBR), available bit ra-te (ABR), unspecified bit rate (UBR), are presented. Among these models, none-real-time variable bit rate model and available bit rate model are presented specially. Matlab language is used to simulate these traffic models. We present simulation results to demonstrate characteristics of traffic model.
