为了设计基于电力线通信（ PLC）的高速可靠通信系统，必须了解衰耗、阻抗、噪声等电力线信道特性。

The design of reliable high speed communication systems for power line communication (PLC) requires an accurate knowledge of such channel specific characteristics as attenuation, impedance and noise.

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急停系统采用数据通信的方式实现并行冗余，提高了系统的可靠性。

The parallel and redundancy are implemented by using data communication method in emergency shutdown for enhancing the reliability of the system.

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在不可靠的通信网络之上建立一个可靠的系统似乎是不可能的。

Building a reliable system that runs over an unreliable communications network seems like an impossible goal.

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