The IP layer, in turn, provides services used by the Internet Control Message Protocol (ICMP) and Transmission Control Protocol (TCP).

反过来，ip层又提供由网际控制报文协议(ICMP)和传输控制协议(TCP)使用的服务。

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It has the following functions: events or continuous waveform transmission, events message notification, backward control and data monitoring, data management, data sharing and so on.

系统具有强震事件准实时传输、连续波形实时传输、事件短消息通知、反向控制与数据监视、数据管理、数据共享等功能。

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Data exchange includes transmission, control, receipt of message packages, and so on.

其中数据交换包括信息数据包的传输、控制、回执，数据同步等。

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