电路交换的交换局 circuit switching exchange 电路交换公共数据网 circuit-switched public data network cspdn ..
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The microwave switching matrix is to exchange messages between ATS and the circuit units under test, and to provide necessary load for these units.
微波开关矩阵主要是实现自动测试系统与被测电路单元之间的信息交换，以及为被测单元提供必要的负载。
This paper introduces a kind of DC-DC PWM switching mode power supply driven by VMOS and applied to Program Exchange. The principle and circuit are presented.
介绍了一种用于程控交换机的由VMOS管驱动的DC - DC PWM开关电源的工作原理与电路设计。
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