提出了一種固定大小幀結(jié)構(gòu)的EPON MAC協(xié)議，采用固定的幀長，提高了以太網(wǎng)交換機(jī)速率。將一幀周期分成三段，光網(wǎng)絡(luò)單元不僅報(bào)告隊(duì)列長度信息，而且報(bào)告幀到達(dá)分布信息，降低了高優(yōu)先級業(yè)務(wù)時(shí)延抖動，授權(quán)采取高優(yōu)先級優(yōu)先授權(quán)的原則，降低了高優(yōu)先級業(yè)務(wù)的接入時(shí)延，滿足了對時(shí)延和時(shí)延抖動敏感語音業(yè)務(wù)的要求。

The paper puts forward a EPON MAC of fixed size frame structure.The frame structure of fixed size can improve the the process velocity of exchanger.Frame cycle is divided into three segments,ONU not only reports the queue size,but also reports the distribution of frame arrival,Which will decrease the delay jitter of high priority traffic.We adopt the principle of first grant of high priority traffic,this can decrease the access delay of high priority traffic. All can satisfy the requests of real-time voice traffic which is sensitive to the delay and delay jitter.