The interconnection of dissimilar LANs over a high-speed backbone network may create congestion and loss of data at a destination LAN because of the dismatch transmission rate. This paper presents a new algorithm which adopts open loop and close loop congestion control. It cooperates the permits and time-stamps schemes,together with the FCFS scheduling poli cy. And it works better than the old algorithms through the simulation experiments.%在通过高速主干网互连局域网时，由于速率不匹配，在目的局域网处会造成拥塞和数据丢失。本文提出了一种同时采用开环和闭环控制，结合许可证控制和时间戳调度策略，以FCFS方式服务的拥塞回避新算法。仿真结果表明，本文提出的新算法优于以往算法。
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