For certain signal types, such as low level or high frequency, the analog backplane should not be used to avoid possible signal degradation.
对于特定的信号类型，例如低电平或高频率，则不宜使用模拟背板，以避免造成信号劣化。
This bridge is the core of communication of the controller system, it connects the bottom level backplane bus, backplane bus controller, and PC EPP parallel port.
该总线桥是某型协调控制器系统的通讯核心，实现了系统下层的背板总线、背板总线管理器与上位机epp并口之间的协议转换以及通讯仲裁功能。
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