STANAG 5066

Icon-5066 follows STANAG 5066 - Edition 3 "Profile for HF Radio Data Communications”, December 2010. This section gives conformance notes on the various Annexes which Icon-5066 supports.

Annex Title Notes
A Subnetwork Interface Sublayer Fully supported, except for Hard Links. Isode is not aware of any STANAG 5066 applications that make use of hard links.
B Channel Access Sublayer Fully Supported.
C Data Transfer Sublayer Fully supported apart from Data Rate Change. Icon-5066 uses S5066-EP4 which provides superior functionality and WBHF support. Icon-5066 will add standard Data Rate Change to support interoperability in a future update.
D Interface between Data Transfer Sublayer and Communications Equipment Supported using Icon-5066 synchronous serial driver.
E HF modem Remote Control Interface Not supported. Obsolete and does not appear to be useful.
F HF Subnetwork Client Requirements Annex F mainly covers applications (see page section). F.16 defines the SIS Protocol ("Raw SIS Socket Server") which Icon 5066 fully supports.
G Use of Waveforms at Data Rates Above 2400 bps Fully Supported.
H Implementation Guide and Notes Guidance is followed where appropriate.
I Messages and Procedures for Frequency Change Not supported.
J General Requirements for Enhanced Media-Access-Control (MAC) Capabilities in Multi-Node STANAG 5066 Networks The model of Annex J is supported. MAC Discovery for Annex L will be implemented in parallel with Annex L (there is no discovery for Annex K, and Annex M is not yet specified).
K High-Frequency Carrier-Sense Multiple-Access (CSMA) Protocols Fully Supported.
L High-Frequency Token-Ring Protocol (WTRP) Requirements. Planned for future release.
M Adaptive Time-Division Multiple-Access (ATDMA) Protocols using STANAG 5066 DTS Layer Messaging Annex M is a placeholder with no technical content.
N Guidance on Address Management in STANAG 5066 Networks. Relevant for deployment but does not apply to products.

STANAG 5066 Extension Protocols

Isode has led community specification of a series of extensions to STANAG 5066 to address a number of deficiencies in Ed3, in particular problems relating to use of STANAG 5069 (WBHF). An index of these specifications is available in the whitepaper [STANAG 5066 Extension Protocol Index]. These specifications have been made available to NATO, so that they can be incorporated into STANAG 5066 Ed4. Icon 5066 makes optional use of these specifications, so can be conformant to Ed3.

Extension Title Notes
S5066-EP2 STANAG 5066 Padding DPDU This uses "spare" transmission space to enable improved resilience and protocol communication of status information.
S5066-EP4 Data Rate Selection in STANAG 5066 for Autobaud Waveforms This provides a modern approach to Data Rate Selection, enabling optimization for both Latency and Throughput. It also provides support for STANAG 5069.
S5066-EP5 STANAG 5006 Large Window Support This addresses ARQ window exhaustion, which will impact ARQ usage with STANAG 5069 (WBHF) and at faster narrowband HF speeds.
S5066-EP6 Slotted Option for STANAG 5066 Annex K This provides high performance and resilience for multi-node networks with a small number of nodes.  It also enables options to support single or multiple concurrent CAS-1 soft links. This provides high performance and resilience for multi-node networks with a small number of nodes.  It also enables options to support single or multiple concurrent CAS-1 soft links.