STANAG 5066 is a NATO specification to enable applications to communicate efficiently over HF radio

High frequency

High frequency radio frequencies are between 3 and 30 MHz. Also known as the decameter band or decameter wave as the wavelengths range from one to ten decameters . Frequencies immediately below HF are denoted Medium-frequency , and the next higher frequencies are known as Very high frequency...

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STANAG 5066 provides peer protocols that operate above an HF modem and below the application level. STANAG 5066 includes the mandatory SIS (Subnet Interface Sublayer, sometimes called Subnet Interface Service) protocol that enables an application to connect to an HF modem through a STANAG 5066 server over TCP/IP. This enables a clean separation between application and modem.

External links

• Isode's whitepaper on STANAG 5066
• Open5066, an open source implementation of NATO NC3A STANAG 5066 protocol stack for HF radio communications