本文件确立了强制性技术标准和设计目标（DO），这些标准和目标是确保长途和战术通信系统的语音（VF）频带中使用的数据调制器-解调器（调制解调器）之间的互操作性和提高性能所必需的。本文件还为新数据调制解调器的设计者提供了指导，这些新数据调制解调器通过指定当前库存中数据调制解调器的技术特性来结合尚未标准化的特性。本指南的目的是确保在具有特定传输信道条件的现有和未来数据调制解调器之间达到最低可接受性能和最大互操作性。

This document establishes mandatory technical standards and design objectives (DO) that are necessary to ensure interoperability and to promote performance among data modulators-demodulators (modems) used in the voice frequency (VF) band of long-haul and tactical communications systems. This document also provides guidance to the designers of new data modems that incorporate characteristics not yet standardized by specifying the technical characteristics of data modems currently in the inventory. The purpose of this guidance is to ensure attainment of minimum acceptable performance and maximum interoperability between existing and future data modems with specified transmission channel conditions.