7号信令系统（SS7）-消息传输部分（MTP）-本标准由八章组成。第一章。111.1提供了7号信令系统（SS7）消息传输部分的功能说明。第一章。111.2描述了用于美国SS7网络的信令数据链路。第一章。111.3描述了通过一条信令数据链路传输信令消息的功能和程序，以及与之相关的功能和程序。在本节中，传输可变长度的“信号单元”，包括正确操作的控制信息。 第一章。111.4描述了信令点之间消息传输的功能和程序，以及与之相关的功能和程序。根据第T1章规定的要求，这些信令网络管理功能确保信令消息的可靠传输。111.6. 第一章。111.5描述了与信息传输部分的设计要求相关且应予以考虑的方面。信令性能是消息传输部分以规定的方式为不同用户传输可变长度消息的能力。 第一章。111.7描述了测试和维护信令网络的方法和程序，以实现第T1章中确定的消息传输部分的性能要求。111.6. 第一章。111.8描述了与美国SS7网络信令代码编号方案相关的方面。

Signalling System Number 7 (SS7) - Message Transfer Part (MTP) - This standard is made up of eight chapters. Chapter T1.111.1 provides the functional description of the Message Transfer Part of Signalling system Number 7 (SS7). Chapter T1.111.2 describes signalling data link to be used for SS7 networks in the United States. Chapter T1.111.3 describes the functions and procedures for, and relating to, the transfer of signalling messages over one signalling data link. In this section, "signal units" of variable lengths are transferred, including control information for proper operation. Chapter T1.111.4 describes the functions and procedures for, and relating to, the transfer of messages between signalling points. These signalling network management functions ensure a reliable transfer of signalling messages, according to the requirements specified in Chapter T1.111.6. Chapter T1.111.5 describes aspects that are pertinent to, and should be considered in, the design requirements of the Message Transfer Part. The signalling performance is the capability of the Message Transfer Part to transfer messages of variable lengths for different users in a defined manner. Chapter T1.111.7 describes means and procedures for the testing and maintenance of the signalling network in order to realize the performance requirements for the Message Transfer Part, as identified in Chapter T1.111.6. Chapter T1.111.8 describes aspects that are pertinent to the numbering scheme of signalling codes for SS7 networks in the United States.