STANAG 5066

Icon-5066 follows STANAG 5066. This section gives conformance notes on the various Annexes which Icon-5066 supports. The primary reference is the most recent ratified version: Edition 3 "Profile for HF Radio Data Communications”, December 2010. Edition 4 is in final draft stage and available on the Isode website.

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. Hard links are deprecated in Ed4.
B Channel Access Sublayer Fully Supported.
C Data Transfer Sublayer Fully supported.
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 removed in Ed4
F HF Subnetwork Client Requirements Annex F mainly covers applications. Support by Isode applications is specified for those applications.. 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. Annex removed in Ed4.
J General Requirements for Enhanced Media-Access-Control (MAC) Capabilities in Multi-Node STANAG 5066 Networks Fully Supported.
K High-Frequency Carrier-Sense Multiple-Access (CSMA) Protocols Fully Supported.
L High-Frequency Token-Ring Protocol (WTRP) Requirements. Fully Supported. Note that the Ed4 specification is followed. See [Wireless Token Ring Protocol]
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]. All of the specifications the Isode has implemented in Icon-5066 are being incorporated into STANAG 4406 Ed4, so this support aligns Icon-5066 to Ed4. All of these options can be turned off, to provide Ed3 interoperability.

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.
S5066-EP10 Extension DPDU This is used by Icon-5066 to support WTRP.
S5066-EP11 Variable C_PDU Segment Size Icon-5066 is interoperable with this specification.