MIL-STD-187-721D
6. The treatment of the basic HF radio and the adaptive technologies for the HF radio contained in MIL-STD-188-141 provides the technical foundation upon which this document rests. The current baseline second generation automatic link establishment (ALE) system was one of the adaptive high frequency (HF) radio features developed through a Massachusetts Institute of Technology Research & Engineering (MITRE) effort in 1986.
7. The principal functions included in an automated HF station are shown schematically on the following figure. This diagram is structured along the lines of the ISO Open Systems Interconnection Reference Model, with functions at each layer supporting higher layers and using lower layers.
8. The contents of this document provide the technical parameters for the functions and features of advanced adaptive HF radio, and provide logical and cohesive guidelines for both industry and the Government. Many of these advanced techniques will support unmanned (lights out) operation of HF standards.
9. The technical parameters of this standard have not been verified by testing or implementation. Careful engineering, desktop modeling, and simulation are the source of these parameters. The preparing activity and the custodians are confident that the technology is definitively developed and is technically sound. Users of this standard are requested to inform the preparing activity and the Lead Standardization Activity (see address below) of planned implementations, the status of those implementations, and any problems encountered in applying this standard.
PREPARING ACTIVITY Headquarters, U.S. Army ATTN: SAIS-ADO
The Pentagon, Room 1C638
Washington, DC 20310-0107
LEAD STANDARDIZATION ACTIVITY DISA
Joint Interoperability and Engineering Organization ATTN: JEBBB
Fort Monmouth, NJ 07703-5613
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