Tactical data links (Link 16 and its relatives) · Wiki

A tactical data link is a standardised means for military platforms and command posts to exchange tactical information in a fixed, machine-readable form. Rather than describing a situation by voice, a platform sends formatted messages that another system can use directly, for example to update a shared picture. The value of the arrangement comes from the standard: forces that implement the same message and network rules can exchange data without bilateral engineering for each pairing.

The NATO standards

NATO publishes tactical data link standards as standardisation agreements (STANAGs), each tied to an Allied publication that holds the technical content. In the NATO Interoperability Standards and Profiles catalogue, STANAG 5516 Edition 8, dated 1 April 2019, is titled Tactical Data Exchange, Link 16, and covers the Allied publication ATDLP-5.16 Edition B Version 1. STANAG 5511 Edition 10, with the same date, covers Link 11 and Link 11B under ATDLP-5.11 Edition B. The catalogue names a tactical datalink capability team as the responsible party. This entry stays at the level of the published titles and catalogue records and does not describe the technical content of the publications.

How it is used

Link 16 and Link 11 are two of the links covered by NATO’s catalogue, and both have current editions listed. Which link a platform carries determines which partners it can exchange data with, so decisions about fitting, upgrading or retiring a link are interoperability decisions as well as technical ones.

Where it fits

A data link carries the output of sensors and the products of sensor fusion between platforms, and it feeds command and control systems that present a common picture. The standards are produced and maintained through NATO’s wider STANAG process, which also governs how editions are revised and how national implementations are tested against them.

Why it matters for defence technology

Tactical data links are among the longest-lived interfaces in military equipment. Platforms may stay in service for decades, and each carries terminals built to a particular edition of a standard. That creates a recurring programme problem: new platforms and software-defined architectures must connect to existing fleets, while the standards themselves change slowly through formal NATO processes. Where terminals are built around reprogrammable radio hardware, as discussed under software-defined radio, changes can in principle be delivered as software, but certification and releasability rules still apply.

What to watch

New editions of the Link 16 publication and the timing of their adoption by member nations.
How older links are retired or bridged to newer ones.
Whether future waveforms and terminals reduce the cost of upgrading fielded platforms.
Work on releasability, so that partner nations can take part within the rules that apply to each publication.