重点介绍了波分复用(WDM)光纤网络的特点、通过选择光波长实现光交换的原理、WDM星形和环形光网络的构成等。
The emphasis is on the characteristics of WDM fiber optic network, the principle of optical switching by selecting wavelength. At last the WDM star and ring networks are addressed as an example.
本文从几何线型选择及椭圆形高速环道主要参数控制几个方面论述了高速环形试验路的设计方法。
This paper discusses the design method for high speed loop test road in terms of selection of geometric alignment and parameters of elliptical high speed test road.
设计五相十拍步进电动机驱动电路时选择了89c 2051作为环形分配器，而功率器件选用电压型的VMOS管。
When designing the step motor drive circuit of 5 phase 10 pat, 89c2051 is adopted as the Loop allotter. The VMOS is adopted in power elements. It is designed as chopper-type constant current circuit.
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