Achieve real time control to hole train and collect or transmit sets of message from train communication network, has become the trend of the train network control technology.

利用列车通讯网络实现整车的实时控制以及各类信息的收集与传递，已经成为今后列车网络控制技术的发展趋势。

youdao

Packet Internet Groper a program used to test whether a particular network destination is online, by sending an Internet control message protocol echo request and waiting for a response.

包因特网查询工具用于通过发送一个Internet控制消息协议回送请求并等待应答来测试一个特定网络目的地是否联机的一种程序。

youdao