Overview
ISO/TS 18234-2:2013 - titled "Intelligent transport systems - Traffic and travel information via Transport Protocol Experts Group, generation 1 (TPEG1) binary data format - Part 2: Syntax, semantics and framing structure (TPEG1‑SSF)" - defines the byte‑oriented syntax, semantics and framing used across TPEG1 data streams. The Technical Specification establishes how TPEG data is encoded, framed and referenced so a receiver can locate, follow or switch to the same service or related services on another bearer channel. It is a bearer‑independent specification intended to support traffic and travel information delivery over almost any digital bearer with an appropriate adaptation layer.
Key Topics
- TPEG layer and frame model - defines transport, service and service‑component levels and their relationships.
- Byte ordering and data type notation - conventions for describing the byte‑oriented protocol and data types.
- Frame structure and synchronization - syncword, field lengths, frame types and synchronization methods for reliable decoding.
- Error detection and CRC - header and data CRC calculations (Annex C) and error detection mechanisms.
- Service referencing and hand‑over models - methods for signaling availability of the same or similar services on other bearer channels to enable continuity.
- Reusable templates and application interfaces - rules for application dependent data types, templates, components and toolkits.
- Auxiliary normative material - character tables (Annex A), coding quantities (Numag method, Annex B), time calculation (Annex D) and a C‑style byte‑stream description (Annex E).
Applications and Who Uses It
ISO/TS 18234-2:2013 is used where robust, interoperable traffic and travel messaging is required:
- Service providers and broadcasters implementing TPEG services to signal service metadata and referencing information.
- Receiver and navigation device manufacturers that decode TPEG1 binary streams and implement service hand‑over.
- Software developers and system integrators building TPEG encoders/decoders, middleware and filtering tools.
- Traffic management authorities and ITS solution vendors who need standardized, bearer‑independent delivery of traffic and travel information.
Practical applications include enabling receivers to discover alternate delivery channels for the same service, maintaining service continuity when users move between coverage areas, and providing standardized metadata (service name, provider, operating hours) to user equipment.
Related Standards
ISO/TS 18234 is a multipart specification. Relevant companion parts include:
- Part 1: Introduction, numbering and versions (TPEG1‑INV)
- Part 3: Service and network information (TPEG1‑SNI)
- Parts 4–11: Application and location referencing specifications (RTM, PTI, LRC, PK1, CTT, TEC, CAI, etc.)
Keywords: ISO/TS 18234-2:2013, TPEG1, TPEG1-SSF, intelligent transport systems, traffic and travel information, syntax semantics framing structure, byte-oriented data stream, service referencing, CRC.
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