以计算机网络通信系统为背景,基于LAN和Internet网络的通信过程和特点,从通信子网的角度分析了实时通信任务的时间约束条件。从端到端通信时延的角度,从整个Internet的角度分析了计算机网络系统的实时能力。实时性能的分析,对计算机网络的QoS具有重要的意义。 Based on the computer network communication system, based on the communication process and characteristics of LAN and Internet, the time constraint of real-time communication task is analyzed from the perspective of communication subnet. From the perspective of end-to-end communication delay, the real-time capability of computer network system is analyzed from the perspective of Internet. Real-time performance analysis of the computer network QoS is of great significance.