摘 要
本文簡單介紹了異步傳送模式(ATM網(wǎng))以及異步傳送模式中的四種業(yè)務(wù)模型:恒定比特率業(yè)務(wù)模型CBR、實(shí)時(shí)可變比特率業(yè)務(wù)模型rt-VBR和非實(shí)時(shí)可變比特率業(yè)務(wù)模型nrt-VBR、可用比特率業(yè)務(wù)模型ABR以及未定義比特率業(yè)務(wù)模型UBR,其中詳細(xì)分析并討論了非實(shí)時(shí)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(yè)務(wù)模型,并使用MATLAB語言對這兩種模型進(jìn)行簡單仿真,用仿真結(jié)果對這兩種模型進(jìn)行性能評價(jià)以闡明業(yè)務(wù)模型的基本特點(diǎn)。
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.