ISO 20105-2015 PDF

Full title and description

Space data and information transfer systems — Operation of CFDP over encapsulation service. This International Standard specifies how the CCSDS File Delivery Protocol (CFDP) is to be operated over the CCSDS Encapsulation Service for Earth–spacecraft, spacecraft–Earth and spacecraft–spacecraft communications, defining the architecture, expected services and the mapping between CFDP requirements and the encapsulation service.

Abstract

The CCSDS File Delivery Protocol (CFDP) supports reliable and best-effort file transfer in space mission environments where links may be long‑delay, noisy or intermittent. ISO 20105:2015 describes the communications architecture and operational rules for running CFDP over the CCSDS Encapsulation Service: it defines the service that CFDP expects from lower layers, reconciles that with the behavior of the Encapsulation Service, and specifies how CFDP operations are to be encapsulated and transported across packet-based space links.

General information

• Status: Published (confirmed after systematic review).
• Publication date: 11 August 2015 (Edition 1).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 49.140 — Space systems and operations.
• Edition / version: Edition 1, 2015 (ISO 20105:2015).
• Number of pages: 14.

Scope

ISO 20105:2015 specifies the operation of the CCSDS File Delivery Protocol (CFDP) when transported over the CCSDS Encapsulation Service. The scope covers the communication architecture, the mapping of CFDP service requirements to the encapsulation service primitives, and guidance on how CFDP behaviour (including its quality-of-service options) should be supported over the encapsulation service used in Earth-to-spacecraft, spacecraft-to-Earth and spacecraft-to-spacecraft exchanges.

Key topics and requirements

• Definition of the communications architecture for CFDP operating over the CCSDS Encapsulation Service.
• Specification of the service expected by CFDP from underlying layers and reconciliation with the Encapsulation Service behaviour.
• Operational rules for encapsulating CFDP PDUs into encapsulation packets for transmission over packet-oriented space links.
• Support for CFDP qualities of service (best-effort and reliable transfer) in long‑delay, noisy and disjoint link environments.
• Interoperability and mapping guidance to ensure CFDP implementations can operate over encapsulation-based packet services.
• Considerations for error handling, segmentation/reassembly and sequencing when CFDP is carried by the encapsulation service.

Typical use and users

Used by aerospace system architects, mission communications engineers, spacecraft software developers and ground-segment integration teams who implement, configure or test file transfer services for space missions. Typical uses include mission data transfer design, interoperability testing between ground and flight CFDP implementations, and integration of CFDP into spacecraft communications stacks that use the CCSDS Encapsulation Service.

Related standards

Closely related CCSDS and ISO documents include the CFDP specification (CCSDS File Delivery Protocol / ISO 17355 series), CCSDS specifications for the Encapsulation Service and related CCSDS packet and framing standards. ISO/TC 20/SC 13 space-data-transfer family publications and CCSDS recommended standards on packet services, AOS/packet framing and mission operations services are typically referenced alongside ISO 20105.

Keywords

CFDP, CCSDS, Encapsulation Service, space communications, file delivery, file transfer protocol, long‑delay networks, spacecraft communications, interoperability, mission data transfer.

FAQ

Q: What is this standard?

A: ISO 20105:2015 is an International Standard that specifies how the CCSDS File Delivery Protocol (CFDP) operates when carried over the CCSDS Encapsulation Service for space communications.

Q: What does it cover?

A: It covers the communications architecture, the mapping of CFDP service expectations to the encapsulation service, operational rules for encapsulation of CFDP PDUs, and considerations necessary to support CFDP’s quality-of-service options over packet-based space links.

Q: Who typically uses it?

A: Spacecraft and ground systems engineers, mission communications architects, spacecraft software developers, system integrators and test teams responsible for implementing or validating file transfer services in space missions.

Q: Is it current or superseded?

A: ISO 20105:2015 is published and was confirmed following systematic review (confirmed in November 2023). As of the confirmation it remains the current edition; users should check national or ISO catalogues for any later amendments or revisions if up‑to‑date status is critical.

Q: Is it part of a series?

A: Yes. It is part of the ISO/CCSDS family addressing space data and information transfer systems and complements other CFDP and CCSDS packet/encapsulation specifications (for example the CFDP specification standardized under CCSDS/ISO documents such as ISO 17355 and CCSDS CFDP recommended standards).

Q: What are the key keywords?

A: CFDP, Encapsulation Service, CCSDS, space data transfer, file delivery, spacecraft communications, long‑delay networks, interoperability.