ISO 22646:2005

Overview

ISO 22646:2005 - Space data and information transfer systems - Space packet protocol specifies the space packet protocol for transferring space application data over networks that include ground-to-space or space-to-space links. Adopted from CCSDS 133.0-B-1 (September 2003), this International Standard defines a unified packet protocol suitable for cross‑agency and multi‑mission use, aligning the specification with the OSI reference model for interoperability across spacecraft, ground stations, and relay nodes.

Key topics and technical requirements

• Protocol scope and structure: Defines the space packet as a Protocol Data Unit (PDU) with primary and optional secondary headers, payload, and packet length conventions (see section structure in the CCSDS Blue Book).
• Services provided: Specifies core services such as packet service and octet-string service, and describes source data handling and service interfaces.
• Protocol procedures: Describes sender, intermediate system (routing/relay), and receiver behaviors including packet creation, forwarding, and delivery.
• Managed parameters and routing: Lists protocol configuration and routing parameters that govern packet handling, addressing, and routing decisions.
• Interoperability and terminology: Unifies terminology and behavior across previously separate CCSDS packet specifications to support cross-support between agencies and missions.
• Conformance & change control: Notes that the standard is maintained under CCSDS document management and includes a review cycle for updates.

Applications and who uses it

ISO 22646:2005 is used by:

• Space agencies and mission integrators (e.g., NASA, ESA, national space agencies) for standardized data exchange and cross-support.
• Satellite manufacturers and spacecraft avionics teams implementing on‑board packet telemetry, telecommand, and payload data transfer.
• Ground segment and network operators designing ground-to-space links, relay networks, and mission operations centers.
• Communications and systems engineers developing inter-satellite links (space-to-space) and integrated space data networks.

Practical applications include telemetry/telecommand transport, science and payload data delivery, inter-satellite communications, and multi-agency mission cross-support where a common packet protocol ensures interoperability.

Related standards

This ISO standard is the adoption of CCSDS 133.0-B-1 and references or aligns with other CCSDS/ISO documents, for example:

• CCSDS family: CCSDS 102, 132, 135 and related Blue Books
• ISO references cited in the adoption: ISO 11104, ISO 22647, ISO 22645, ISO 22664, ISO 22666, ISO 13419, ISO 12174

ISO 22646:2005 is essential for engineers and architects building compliant, interoperable space communications systems using the space packet protocol. Keywords: ISO 22646:2005, space packet protocol, CCSDS, space data transfer, ground-to-space, space-to-space, satellite communications, protocol data unit.