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高速数据总线（ＨＳＤＢ）协议定义了多优先级方案来处理时间苛刻消息和时间非苛刻消息的数据传输，这是通过四个定时器（一个令牌保持定时器（ＴＨＴ）和三个个牌旋转定时器（ＴＲＴ））在不同的优先级之间分配网络带宽，同时增大时间非苛刻消息的延时来满足时间苛刻消息的传输．本文在网络上各站的ＴＨＴ和ＴＲＴ初始值相同、消息包到达率相同和消息包长度分布相同的条件下分析了多优先级方案的特性，建立了ＨＳＤＢ网络的平均吞吐量模型，导出了不同优先级的平均吞吐量解析表达式，并通过软件仿真验证了由模型得到的解析表达式。
The High-Speed Data Bus (HSDB) protocol defines a multi-priority scheme to handle data transmission of time critical messages and non-critical time messages by rotating four timers (one token hold timer (THT) and three cards Timers (TRTs) allocate network bandwidth between different priorities while increasing the latency of non-harsh time-consuming messages to meet the transmission of time critical messages. In this paper, the characteristics of multi-priority schemes are analyzed under the same initial values of THT and TRT, the same arrival rate of packet and the same length of packet, and the average throughput model of HSDB network is established. Priority average throughput analysis expression, and through the software simulation to verify the model obtained by the analytical expression.