摘 要
本文簡單介紹了異步傳送模式(ATM網)以及異步傳送模式中的四種業務模型:恒定比特率業務模型CBR、實時可變比特率業務模型rt-VBR和非實時可變比特率業務模型nrt-VBR、可用比特率業務模型ABR以及未定義比特率業務模型UBR,其中詳細分析并討論了非實時的可變比特率Nrt-VBR(Non-Real-Time Variable Bit Rate)和可用比特率ABR(Avail- able Bit Rate)兩種業務模型,并使用MATLAB語言對這兩種模型進行簡單仿真,用仿真結果對這兩種模型進行性能評價以闡明業務模型的基本特點。
關鍵詞: ATM網;VBR業務;nrt-VBR業務;ABR業務;MATLAB語言
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.