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分析了采用TDMA方案按固定信元封装组帧的ATM-PON系统的上行接入控制方案和基于千兆以太网的宽带无源光接入网(EthernetPON)的可变时隙TDMA动态带宽分配的接入控制方案。后一方案采用轮转调度(round-robinscheduling)的方式对各ONU进行轮询,依据它们各自缓冲区中预备发送的长度不定的数据发送请求,根据多用户接入和业务类型进行以太包调度,因此该方案能提供接入网的可扩展性以及ONU之间的统计复用,提高带宽利用率。文中提供了两种接入控制方案的流程,并着重对更具潜力的EPON系统的接入控制方案进行了详尽的分析和研究。
This paper analyzes the uplink access control scheme of ATM-PON system adopting TDMA scheme to encapsulate frame by fixed cell and the variable time-slot TDMA dynamic bandwidth allocation of Gigabit Ethernet-based broadband passive optical access network (EthernetPON) Access control scheme. The latter scheme uses round-robinscheduling to poll each ONU and send the request according to the length of the data to be sent in its own buffer, and schedule the Ethernet packet according to the multi-user access and the service type. Therefore, The solution can provide access network scalability and statistical multiplexing between ONUs to improve bandwidth utilization. The article provides two kinds of access control scheme flow, and emphatically analyzes and studies the access control scheme of the more potential EPON system.