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。
The IP layer, in turn, provides services used by the Internet Control Message Protocol (ICMP) and Transmission Control Protocol (TCP).
在此基础上详细说明了PROFIBUS - DP协议的结构，包括数据传输报文、安全机制和可用的传输服务。
In addition, the structure of the PROFIBUS-DP protocol including data transmission messages, security mechanism and the available transmission services were also analyzed in details.
ACARS报文通信服务器实现了实时接收、发送和分发acars报文。
The multithread concurrent server can receive, send and distribute ACARS messages in real time.
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