APON的帧结构和MAC协议设计及其性能分析  

Design and Performance Analysis of Frame Structure and MAC Protocol for APON Sys tem

作　　者：乔耀军[1] 于晓映[1] 濮宏图[1] 管克俭[1] 陈雪[1] 

机构地区：[1]北京邮电大学,125信箱北京100876

出　　处：《电子学报》2000年第7期117-119,共3页Acta Electronica Sinica

基　　金：国家自然科学基金!(No.698962 4 2 );博士后基金资助课题

摘　　要：本文参照以ATM为基础的无源光网络 (APON)的G 983建议 ,提出了一种新的传输帧结构和媒质接入控制 (MAC)协议 .传输帧长选为 12 5 μs,这有利于STM业务的接入 .考虑到话音业务对时延敏感并且传输速率较低的特点 ,MAC协议对话音业务实行固定带宽分配 .对其它类型的业务则采用基于预留的动态带宽分配方案 .通过建模仿真分析了协议的信元时延 (CD)和信元时延变化 (CDV)特性 .Associated with ITU-T recommendation G.983 about ATM based passive optical netw ork (APON),a new frame structure and a medium access control (MAC) protocol are presented in this letter.The length of the frame is 125μs,which is very favorab le to access STM(Synchronous transfer mode) services.For voice service,because i t is sensitive to time delay and has very low bit rate,we adopt fixed bandwidth allocation.But for other services,we use dynamic bandwidth allocation.The CD (ce ll delay) and CDV (cell delay variation) characteristics of this MAC protocol ar e analyzed under several service scenarios through computer simulation.

关 键 词：ATM 无源光网络 MAC协议 帧结构 

分 类 号：TN929.1[电子电信—通信与信息系统]