ISO 17355:2007

Overview

ISO 17355:2007 - Space data and information transfer systems: CCSDS file delivery protocol (CFDP) - defines a standard file delivery service and protocol for the space environment. Published as the third edition in 2007 (based on CCSDS 727.0-B-3, June 2005), the standard specifies how files are exchanged over CCSDS packet services (conventional telecommand, telemetry and AOS path service) and across a variety of ground network services. CFDP supports space-to-ground, ground-to-space and space-to-space transfers and assumes a virtual filestore model that implementations map to actual onboard or ground file systems to preserve interoperability.

Key Topics and Requirements

• Protocol scope: File transfer service for spacecraft mass memory and related ground systems using CCSDS packet infrastructures.
• Transport environments: CCSDS conventional packet telecommand, conventional packet telemetry, AOS path service, and compatible ground networks.
• Transfer directions: Space-to-ground, ground-to-space, space-to-space; transfers may be initiated by sender or receiver.
• Virtual filestore model: Protocol elements assume a common, abstract filestore; implementations must map virtual filestore semantics to OS-dependent storage.
• Service primitives & PDUs: Defines CFDP service primitives and detailed PDU formats for directive and data exchange (core and extended procedures).
• Operational procedures: Core file delivery procedures plus extended behaviors (e.g., unacknowledged-mode handling updates in Issue 3).
• User operations: Support for proxy operation, directory operations, remote status reporting, remote suspend/resume and other file management interactions.
• Design constraints: Addresses space constraints such as limited computational resources, noisy/limited/asymmetric/interrupted links and long propagation delays; supports early access to partially transferred data where needed.

Applications and Who Uses It

• Satellite and spacecraft system architects and software engineers implementing onboard file transfer and mass memory access.
• Mission operations and ground-segment developers managing payload data delivery, command file uploads, and cross-support between agencies.
• Developers of relay and inter-spacecraft communication systems enabling space-to-space file exchange.
• Integrators building protocols that require guaranteed or best-effort file delivery over CCSDS packet services.
  Practical uses include reliable science-data downloads, commanding via file upload, store-and-forward relay operations, and autonomous file transfer between spacecraft and ground.

Related Standards

• CCSDS 727.0-B-3 (CFDP Recommended Standard - source publication)
• CCSDS documents mapped to ISO standards cited in the ISO text:
  • CCSDS 732.0-B-1 = ISO 22666:2005
  • CCSDS 132.0-B-1 = ISO 22645:2005
  • CCSDS 133.0-B-1 = ISO 22646:2005
  • CCSDS 232.0-B-1 = ISO 22664:2005

Keywords: CCSDS file delivery protocol, CFDP, space file transfer, virtual filestore, spacecraft mass memory, space-to-ground file transfer, AOS path service, CCSDS packet telemetry, telecommand.