Tactical Data Links - Interim JTIDS Message Specification (IJMS)
Key words and phrases: tactical data links, Interim JTIDS Message Specification, IJMS
JTIDS/IJMS - Interim JTIDS Message Specification - came into existence because the hardware for JTIDS was available before the US TADIL-J message standard (on which Link 16 is based). Therefore IJMS was developed to provide an initial JTIDS operating capability for the USAF and was implemented in the NATO E-3A, UK E-3D and French E-3F.
It is based on Link 11 messages packaged to fit into the JTIDS architecture. Consequently, it has the same functionality as Link 11 but with a greater capacity and ECM-resistance. However, it is not optimised for the JTIDS architecture and cannot use the enhanced JTIDS features which increase data throughput.
IJMS is implemented in the UK ground environment for commonality with NATO E-3As, and the UK E-3D, while within NATO only limited IJMS capabilities have been implemented in NADGE CRCs. Some US fighters have a dual IJMS/Link16 capability.
Data Link descriptions: Tactical Data Links | Link 16 | Link 11 | Link 22 | IJMS | Link 1 | Link 14 | Link 4 | Other protocols | CDL, TCDL & HIDL | Satellite Link 16 | Variable Message Format - VMF
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