高数据传输速率以及终端的高速移动，导致无线通信信道具有时间选择性与频率选择性两个特征。
High data transmission rates and high mobility give rise to time - and frequency - selectivity in wireless communication channels.
当信道上没有数据传输时，通信双方应每隔时间C发送链路检测包以维持此连接。
When there are not data being transmitted on the channel, both sides shall send link test packets every time interval C to maintain the connection.
阐述了IEC 61850对逻辑节点、通信信息片、事件时间、传输时间、报文的类型和性能级的定义。
The definitions given by IEC 61850 on logical nodes (LNs), PICOM, event time, transfer time, types and performance classes of message are expounded.
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