ISO 22669-2021 PDF

Full title and description

Space data and information transfer systems — Space link extension (SLE) — Return-all-frames service specification (ISO 22669:2021). This international standard defines the RAF (Return-All-Frames) SLE transfer service, including the operations, associated parameters, behaviours and valid operation sequences required to deliver all telemetry link-layer frames from a single space link physical channel to a remote user.

Abstract

ISO 22669:2021 specifies the RAF service abstractly: the operations needed to provide the service, the parameter data for each operation, the behaviour resulting from invoking each operation, and the valid relationships and sequences of operations. The document purposely does not prescribe specific implementations, ground-station internal interfaces, methods for acquiring telemetry frames from spacecraft signals, or operational management procedures such as scheduling and configuration. The edition incorporates clarifications and updates aligned with CCSDS SLE/telemetry-related recommendations.

General information

• Status: Published.
• Publication date: June 2021.
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 49.140 (Space systems and operations / Space data and information transfer systems).
• Edition / version: 4th edition (ISO 22669:2021).
• Number of pages: 136.

Scope

This standard defines the Return-All-Frames (RAF) transfer service of the Space Link Extension (SLE) family in an abstract, implementation‑neutral manner. It covers the service operations (for example bind/unbind and data transfer modes), required parameters, expected service behaviours and valid operation sequences needed for a remote user to receive all link-layer telemetry frames from a single space link physical channel. It explicitly excludes requirements for specific product implementations, ground‑internal interfaces, telemetry acquisition techniques from RF signals, communications-environment provisioning, and higher-level management activities such as scheduling and operational control.

Key topics and requirements

• Abstract service specification of the RAF transfer service: operations, parameters and behaviour models.
• Service operations such as RAF-BIND and RAF-UNBIND and their valid invocation sequences.
• Data transfer modes (online timely, online complete, offline) and provider/receiver buffering/behaviour considerations.
• Architecture and functional models for SLE RAF (functional and cross‑support views).
• Operational scenarios and service management considerations for cross‑support use.
• Security aspects relevant to RAF transfer service interactions and access control.
• Conformance considerations and annex material addressing production status and updates to coding/synchronization expectations.

Typical use and users

Primary users are space agencies, mission operations centres, ground-segment developers, spacecraft data system integrators, ground-station operators and contractors implementing cross-support or centralized data distribution services. Typical uses include remote delivery of raw telemetry frames from a ground station to a mission user, cross-support operations between agencies, and integration of SLE-capable ground infrastructure to enable distributed mission processing and science data distribution.

Related standards

ISO 22669 is part of the SLE family of standards and is typically used alongside other SLE specifications such as ISO 22670 (Return-channel-frames service), the SLE core API and application interface specifications, and the underlying CCSDS SLE/Blue Book recommended standards (CCSDS 911.x and related documents). Implementers commonly reference the CCSDS recommended standards and companion ISO SLE documents to ensure end-to-end interoperability.

Keywords

Space Link Extension (SLE), Return-All-Frames (RAF), telemetry frames, space data transfer, CCSDS, ground segment, RAF-BIND, RAF-UNBIND, SLE transfer services, cross-support.

FAQ

Q: What is this standard?

A: ISO 22669:2021 is the international standard that defines the Return‑All‑Frames (RAF) service of the Space Link Extension (SLE) family — an abstract specification of the service operations, parameters and behaviours used to deliver all link‑layer telemetry frames from a single space link physical channel to a remote user.

Q: What does it cover?

A: It covers the RAF service operations (including bind/unbind and transfer modes), parameter data, expected behaviours when operations are invoked, valid operation sequencing and associated architecture and operational scenarios. It does not mandate product implementations, signal‑acquisition methods, or operational scheduling and management procedures.

Q: Who typically uses it?

A: Space agencies, mission operations and ground‑segment implementers, ground station operators, systems integrators and contractors who need to implement or interoperate with SLE RAF services for telemetry distribution and cross‑support operations.

Q: Is it current or superseded?

A: ISO 22669:2021 is the current published edition (4th edition, published June 2021). It supersedes the previous ISO 22669:2013 edition and incorporates clarifications and updates aligned with CCSDS recommended standards.

Q: Is it part of a series?

A: Yes — it is part of the SLE family of standards (ISO/TC 20/SC 13 work) and is used together with related ISO SLE documents (for other transfer services such as Return-Channel-Frames) and CCSDS SLE recommended standards to achieve interoperable space data transfer services.

Q: What are the key keywords?

A: RAF, SLE, Return-All-Frames, telemetry frames, CCSDS, space data transfer, ground station, RAF-BIND, RAF-UNBIND.