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作为共享介质的接入网络 ,APON需要介质访问控制协议用于协调各终端对介质的存取。本文提出了一个符合 ITU- T建议的 MAC协议 ,采用了时延分优先级 ,对高优先级的实时业务按照的均匀间隔的原则分配带宽 ,低优先级业务的带宽按次序循环分配。上行帧长度根据处于连接的用户数动态变化 ,各终端的带宽申请时隙由系统动态分配。最后给出了由该协议确定的网络性能的计算机仿真结果。
As an access network for the shared media, APON needs a media access control protocol for coordinating the access of the terminals to the media. In this paper, a MAC protocol conforms to ITU-T recommendation is proposed, which adopts the time-delay sub-priority to allocate bandwidth according to the uniform interval principle of high-priority real-time services. The bandwidth of low-priority services is circulated in sequence. The length of the uplink frame changes dynamically according to the number of connected users. The bandwidth allocation slots of each terminal are dynamically allocated by the system. Finally, the computer simulation results of network performance determined by this protocol are given.