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151-4是由两台151-3构成的大型双机复合系统,两台处理机可以灵活地组成系统不同的工作状态以适应各种用途。主机平均运算速度单机浮点64位(二进制)字长为130万次/秒,32位字长为250万次/秒。由于它不仅用于科学工程计算,而且还用于实时数据处理,因此对系统的可靠性和可维性要求很严格(MTBF=3600小时)。为满足系统的I/O要求,151-4交换器的信息流量大,每秒达4～6兆位,外设通道多(128个),通道采用标准接口,以方便于外部设备的埔减与更新。两台主机均可访问任一外设通道。151-4交换器结构上的一重要特色是采用模块化双工结构。它任主要功能块中设有强有力的故障检测手段,以实现双工部件间的动态备份,自动切换。运行实践表明,这种结构对于提高系统的可靠性和可维性是行之有效的。
151-4 is composed of two 151-3 large-scale two-plane composite system, two processors can flexibly form a system of different working conditions to adapt to a variety of purposes. Average Host Speed The 64-bit (binary) single-machine floating-point word size is 1.3 million times per second and the 32-bit word length is 2.5 million times per second. Because it is not only used for scientific engineering calculations, but also for real-time data processing, the system reliability and dimensional requirements (MTBF = 3600 hours) are stringent. To meet the system’s I / O requirements, the 151-4 switch has a large data traffic of 4 to 6 megabits per second and a large number of peripheral channels (128 channels). The channels use standard interfaces to facilitate the porting of external devices With updates. Both hosts have access to any peripheral channel. An important feature of the 151-4 switch fabric is its modular duplex structure. It is the main function block with a powerful fault detection means to achieve dynamic backup between duplex components, automatic switching. Operational practice shows that this kind of structure is effective in improving the reliability and maintainability of the system.