在a区？ANSI 2型光端口协议规范？was开发了与IEEE点传输协议（ANSI-C1170A.18）的光连接。ANSI C12。18/MC12。18/IEEE 1701协议包括一种称为电能计量协议规范（PSEM）的应用程序语言，允许应用程序读取和写入表格。a？电话调制解调器通信协议规范？（ANSI C12.21/MC12.18/IEEE 1702）随后被开发，以允许设备使用PSEM通过电话调制解调器传输表格。 本标准扩展了ANSI C12的概念。18/MC12。18/IEEE 1701，ANSI C12。21/MC12。18/IEEE 1702和ANSI C12。19/MC12。19/IEEE 1377标准，允许通过任何可靠的网络通信系统传输表格数据。注意，在这个词的用法中，a？布莱亚？这意味着对于发送的每一条消息，发送方都可以选择接收响应:肯定确认或错误消息。也就是说，消息不能在可靠的网络中无声地失败（参见IPPA[B1]中关于可靠流传输服务的讨论）。 2此外，本标准描述了C12之间可选的暴露点对点接口。22个设备和一个C12。22通信模块设计用于连接到？安雅？网络条款a？C12。22 XXXXa？（例如，C12.22设备）由ANSI C12引入。22-2008. 这些术语可以替换为术语a？IEEE 1703 XXA？；i、 例如，IEEE 1703设备与ANSI C12相同。22设备和IEEE 1703通信模块与C12相同。22.通信模块。 然而，由于本标准最初是在ANSI C12 SC17 WG1的支持下制定的，因此本文件术语基于C12。22个任期。FutureMore的标准定义了一种捕获、翻译和传输单向设备消息（脱口而出）的方法。

In the "Protocol Specification for ANSI Type 2 Optical Port" Standard (ANSI C12.18/MC12.18/IEEE 1701), a point-to-point protocol was developed to transport table data over an optical connection. The ANSI C12.18 / MC12.18/IEEE 1701 protocol include an application language called Protocol Specification for Electric Metering (PSEM) that allows applications to read and write Tables. The "Protocol Specification for Telephone Modem Communication" (ANSI C12.21/MC12.18/IEEE 1702) was then developed to allow devices to use PSEM to transport Tables over telephone modems. This standard extends the concepts of ANSI C12.18/MC12.18/IEEE 1701, ANSI C12.21/MC12.18/IEEE 1702, and ANSI C12.19/MC12.19/ IEEE 1377 standards to allow transport of Table data over any reliable networking communications system. Note that in this use of the word, "reliable" means that for every message sent, the sender receives a response at its option: either a positive acknowledgment or an error message. That is, messages cannot fail silently in a reliable network (see discussion of Reliable Stream Transport Service in IPPA [B1]).2 In addition, this standard describes an optionally exposed point-to-point interface between a C12.22 Device and a C12.22 Communications Module designed to attach to "any" network. The terms "C12.22 XXXX" (e.g., C12.22 Device) were introduced by ANSI C12.22-2008. These terms can be interchangeably replaced with the terms "IEEE 1703 XXXX"; i.e., the IEEE 1703 Device is the same as the ANSI C12.22 Device and the IEEE 1703 Communication Module is the same as the C12.22 thiCommunication Module. However, since this standard was originally developed under the auspice of ANSI C12 SC17 WG1, the document terminology is based on C12.22 terms. Furthermore,s standard defines a methodology to capture, translate, and transmit one-way device messages (blurts).