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MIL-STD-188-216 Revision A, February 20, 1993
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Includes all amendments and changes through Cancellation Notice 2, July 30, 2004
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The purpose of this document is to establish technical standards and Design Objectives (DOs) that are necessary to ensure interoperability and to promote commonality for communications equipment and subsystems using Data Adapter Control Mode (DACM) procedures. Another purpose of this document is to establish acceptable overall system performance in order to satisfy diverse user requirements without the restrictions caused by interface interoperability problems. Message formats specified for use by the DACM are defined in Allied Communications Procedures (ACP-127), Communications Instructions Tape Relay Procedures; Defense Operating Instruction (DOI)-103, Defense Special Security Communications System (DSSCS) Operating Instructions (U) System/Data Procedures; and Joint Army Navy Allied Procedures (JANAP-128), Automatic Digital Network (AUTODIN) Operating Procedures.

This document specifies the minimum requirements necessary to develop a Data Adapter Control Mode protocol procedure. It is not the intent of this document to specify any particular hardware or software design or implementation. Message formats are not specified in this standard.

This document is applicable to the design and development of new equipment, assemblages, and systems using DACM. This document is applicable also to the engineering and operation of existing DACM systems. It is not intended that existing DACM systems be immediately converted to comply with the standards contained in this document. New DACM systems and those undergoing major modification or rehabilitation shall comply with the standards contained in this document subject to applicable requirements of current procurement regulations. DACM can be used over common long haul and tactical communications circuits. In this case, both this document and Military Standard (MIL-STD)-188-100 shall apply.

The objectives of this document are to provide system performance requirements that ensure interoperation of equipment and systems consistent with military requirements; to achieve the necessary degree of performance and interoperation in the most economical way; and to prevent proliferation of equipment serving the same or a similar function. The variety of equipment shall be the minimum necessary to effectively support the missions of the government in accordance with Department of Defense Directive (DODD) 4630.5, Compatibility and Commonality of Equipment for Tactical Command, Control, and Communications. These objectives will be accomplished by continuing efforts in the following areas:

a. Standardizing user-to-user performance characteristics.

b. Standardizing the type of signals at various interface points in the applicable system.

c. Specifying maximum permissible degradation of a signal in the process of transmission and allocating the permissible degradation among various parts of a system.

d. Defining performance parameters without specifying the technology that should be used to obtain the required performance.

The parameters and other requirements specified in this document are mandatory system standards if the word "shall" is used in connection with the parameter value or requirement under consideration. Nonmandatory system parameters and DOs are indicated as optional by the word "should" in connection with the parameter value or requirement under consideration. For a definition of the terms "system standards" and "design objective," see Federal Standard (FED-STD)-1037, Glossary of Telecommunications Terms. Information paragraphs, shown as notes, have been included to better define methods currently in use with the DACM.

As a minimum, only those features or functions specified herein, necessary to ensure interoperability among systems, shall be implemented in an equipment item. While every effort has been made to include all the features necessary for protocol implementation, certain aspects are dependent upon system application and must be tailored by the specification writer. These aspects include alarm functions, Mode VI block group size, data rates, codes, message formats, etc.