STANAG 5066 is being updated to Edition 4. This page provides easy access to the latest drafts, to facilitate review and comment. It is provided as a single document, with current version and previous versions. This page also lists annexes which the editor recommends are removed from Edition 4, with a short rationale for the removal. The latest version of each annex and the main body are also provided as separate documents. Each annex and the main body have an independent version number and date. Each Annex has a section noting changes from Edition 3.


This information is provided to support review, which is encouraged. Document updates will be provided in response to review comments. Please send comments to the editor (Steve Kille) and/or the mailing list as appropriate.

Information on these documents is sent to a mailing list, to subscribe for updates please fill out this form. This list is open to any interested parties.

When deemed ready by the STANAG 5066 Custodian (FMV), it is anticipated that the draft STANAG and supporting material will be posted to the NATO BLOS web site.

Draft Version 1.0 (April 20th 2020) of STANAG 5066 Edition 4 is here.

Separate main body and annexes are listed in the table below.

Main Body

Annex A: Subnetwork Interface Sublayer

Annex B: Channel Access Sublayer

Annex C: Data Transfer Sublayer

Annex D: Interface between Data Transfer Sublayer and Communications Equipment.

Annex E: HF Modem Remote Control Interface. Recommended to remove.  This serial control interface has not proved useful.  Any interface would need updating for new waveforms, bandwidths, modern modem control and ALE.    There does not appear to be industry desire to work on this. Modern modem interfaces are complex and vary between vendors.

Annex F: SAP Assignment

Annex G: Use of Waveforms at Data Rates Above 2400 bps.  Recommended to remove. This is covered in updated Annex C, and there is no need for a separate annex.

Annex H: Implementation Guide and Notes.  Recommended to remove. Much of this is obsolete and coverage is selective and eccentric. Some aspects are out of data. The annex feels old and incomplete. Leaving the annex “as is” seems highly undesirable. The benefits of updating this annex seem unclear, and it would be a lot of effort.  Some key points are included in other annex updates.

Annex I: Messages and Procedures for Frequency Change.   Recommended to remove.  This is a fragile and inefficient procedure.  Frequency selection in modern systems is handled by ALE and this annex is obsolete.

Annex J: General Requirements for Enhanced Media-Access-Control (MAC) Capabilities in Multi-Node STANAG 5066 Networks.

Annex K - High-Frequency Carrier-Sense Multiple-Access Protocol

Annex L - High-Frequency Wireless-Token-Ring-Protocol (WTRP) Requirement

Annex M: Adaptive Time-Division Multiple-Access (ATDMA) Protocols using STANAG 5066 DTS Layer Messaging (this annex is currently empty, with the title as a placeholder).  No changes needed.

Annex N: Guidance on Address Management in STANAG 5066 Networks.

Annex O: HF Operator Chat

Annex P: ACP 127 & Character-Oriented Serial Stream

Annex Q: ACP 142

Annex R: Routing Sublayer

Annex S: SIS Access Protocol

Annex T: STANAG 5066 TRANSEC Crypto Sublayer using AES and other Protocols

Annex U: IP Client

Annex V: Compressed File Transfer Protocol