本文件规定了确保互操作性和提高远程和战术通信系统语音频率（VF）频段中使用的数据调制器、解调器（调制解调器）性能所需的强制性技术标准和设计目标（DO）。本文件还通过指定库存中当前数据调制解调器的技术特性，为包含尚未标准化特性的新数据调制解调器的设计师提供指导。本指南的目的是确保在具有指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.