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.
该方法能提供报文服务和短帧信息结构，满足现场通信的实时性要求。
According to this solution, the requirement of real-time in field communication can be fulfilled as a result of its message service and short frame structure.
分析和证明了在提供面向连接服务的TCP层实现报文加密、认证和签名的可行性，提出了一种TCP保密连接协议。
Analyzes and proves the feasibility mat a connection oriented TCP protocol can carry out data encryption, authentication and signature in theory. Furthermore, a secure connection protocol is advanced.
定义了 GSSP相关概念和一个最小服务原语集合 ，包括安全上下文管理、安全联合管理、报文封装原语 。
Some terms related to GSSP are defined, and a minimum set of primitives of GSSP is proposed, which includes security context management, security association management, and message encapsulat.
定义了 GSSP相关概念和一个最小服务原语集合 ，包括安全上下文管理、安全联合管理、报文封装原语 。
Some terms related to GSSP are defined, and a minimum set of primitives of GSSP is proposed, which includes security context management, security association management, and message encapsulat.
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