Overview
IEC 62287-2:2017 defines operational and performance requirements, test methods and required test results for Class B "SO" shipborne AIS equipment that use self‑organising time division multiple access (SOTDMA) techniques. The standard implements the SOTDMA procedures described in Recommendation ITU‑R M.1371 and aligns with related IEC and national standards to ensure interoperability, safety and reliable performance of AIS Class B SOTDMA transceivers. A notable change in this edition is the introduction of transmission of Message 27 on channels 75 and 76 for long‑range broadcast applications.
Key topics and technical requirements
- Scope and functionality: Capabilities, quality assurance, safety of operation and required user manuals and marking for Class B SOTDMA AIS equipment.
- Physical and environmental requirements: Power supply, vibration, shock, temperature, humidity, EMC and safety tests to verify ruggedness for maritime use.
- Performance requirements: Internal processes, operating frequency channels, GNSS position reporting (internal GNSS receiver), identification and AIS information content and reporting intervals.
- Protocol stack:
- Physical layer: Receiver and transmitter characteristics, modulation accuracy and spectrum compliance.
- Link layer (MAC, DLS, LME): Medium access control using SOTDMA, data link services and link management behaviors including multi‑channel operation.
- Network/Transport layers and presentation: Message handling, long‑range broadcast behaviour and DSC receive capability.
- Operational tests: Autonomous and polled modes, single message handling, channel selection rules, initialisation timing, alarms, built‑in integrity tests (BIIT) and transmitter shutdown/fallback.
- Test regimes and methods: Standard test signals, test environment, measurement uncertainties and required pass/fail criteria for operational, physical and EMC tests.
Practical applications and users
IEC 62287-2:2017 is used by:
- Manufacturers and designers of Class B SOTDMA AIS transceivers to design compliant hardware and firmware.
- Test laboratories and certification bodies for type approval and conformity assessment.
- Shipbuilders, installers and vessel operators to select and commission compliant AIS Class B equipment.
- Maritime regulators and surveyors for enforcement of equipment standards and safe navigation practices.
Practical benefits include ensured interoperability with AIS networks, verified GNSS reporting and robust long‑range broadcast capabilities (Message 27 on channels 75/76), improving situational awareness and collision avoidance.
Related standards
- ITU‑R M.1371 (AIS technical recommendations)
- Other IEC AIS standards and applicable national regulations referenced within IEC 62287-2 for complete compliance and system integration.