MIL-STD-188/110B, DEPARTMENT OF DEFENSE INTERFACE STANDARD: INTEROPERABILITY AND PERFORMANCE STANDARDS FOR DATA MODEMS (27 APR 2000)., 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.