MIL-STD-187-721 Interoperability And Performance Standard For Advanced Adaptive Hf RadioThe purpose of this document is to describe the technical parameters for adaptive high frequency HF radio that are more advanced than those described in MIL-STD-188-141. The advanced technology contained in this standard will guide the planning of military adaptive HF radio network technology into the 21st century. To fully understand and utilize this document, it is necessary to refer to portions of MIL-STD-188-141.

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MIL-STD-187-721D

4.14 HF e-mail.

Messages sent using HF skywave links shall use the following protocols to ensure interoperability, performance, and high efficiency. Use of other protocols (e.g., for surfacewave applications) requires a gateway for conversion to and from this suite. Interface to the Internet also requires a gateway for conversion to and from this suite.

The HF Mail Transfer Protocol (HMTP) shall be used at the Application Layer.

The Automatic Message Exchange (AME) protocol in accordance with MIL-STD-

188-141 Appendix D shall be used at the Network Layer.

The HF Data Link Protocol (HFDLP) in accordance with MIL-STD-188-110

Appendix B shall be used at the Data Link Layer.

The Physical Layer shall consist of serial-tone HF data modems in accordance with

MIL-STD-188-110 and HF radios in accordance with MIL-STD-188-141. See MIL-STD-188-141 for details.

4.15 Automatic location feature.

Automatic location reporting is an optional feature. If provided, it shall comply with this section and section 5.15.

4.15.1 Automatic reporting.

If implemented in a second-generation ALE system, the automatic location feature shall embed a Location Report CMD (see 5.15) in the message section of each ALE transmission. Location reporting for third-generation ALE systems is not yet standardized. The specific version of the CMD sent determines the precision of the location report; this selection shall be programmable at the network management interface.

4.15.2 Disable capability.

The operator shall have the capability to disable automatic reporting, and to manually send a location report while automatic reporting is disabled.

4.15.3 Secure transmission.

Location reports constitute sensitive information. Procuring agencies shall determine the degree of security required for location reports. Use of Linking Protection in accordance with MIL- STD-188-141 Appendix B provides a range of cryptographic protection from Type IV to Type I algorithms.