首先构建了交换式以太网端到端时延模型，对网络传输延时进行了理论计算，提出了影响时延的关键因素；然后针对不同数量中间交换设备和不同负荷大小下的传输延时进行了测试与分析，对系统整体图像延时进行了验证；最后，以工作面最大系统为极端情况，通过固定延时计算与可变时延分析，得出了工作面视频传输系统在最大中间交换设备数量时满足实时性条件下，所允许的最大通信负荷。%This paper firstly constructs the end-to-end delay model of Switched Ethernet, and calculates the network transmission delay in theory, then presents the key factors affecting the delay. Next, test and analyze the transmission delay in different amount of switching equipment and different data load, and verify the system overall image delay. Finally, in extreme cases of working face maximum system and maximum number of intermediate switching equipment, by calculation of fixed delay and analysis of variable time delay, obtain the maximum allowable communication load of the whole system in which the transmission system can meet the real-time requirements of video transmission.
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