ISO 18426-2013 PDF

Full title and description

Space data and information transfer systems — Spacecraft Onboard Interface Services — Subnetwork Memory Access Service. This International Standard defines the SOIS Subnetwork Memory Access Service: the service interface and behaviour for reading and writing memory locations or memory blocks distributed across an onboard subnetwork (service specification only; methods of providing the service over specific data links are out of scope).

Abstract

ISO 18426:2013 is one document in the Spacecraft Onboard Interface Services (SOIS) family. It specifies the Subnetwork Memory Access Service (SMAS) — primitives, parameters, management objects (MIB), and conformance information — intended to be applied together with the SOIS Green Book. Protocol- and link-specific implementations are to be documented separately (missions, agencies or CCSDS).

General information

• Status: Published (ISO review stage: close of review / under review as per ISO lifecycle).
• Publication date: 2013 (ISO listing: 2013-06; national listings record availability from 29 May 2013 / 30 June 2013).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 49.140 (Space systems and operations).
• Edition / version: Edition 1 (2013).
• Number of pages: 29 (ISO official document). Note: some national/adopted publications (for example BSI/BS ISO) list a different page count for the national format (commonly shown as 38 pages).

Scope

ISO 18426:2013 specifies the Subnetwork Memory Access Service (SMAS) as part of SOIS: a service that provides read/write access to distributed memory locations or memory blocks on an onboard subnetwork. The standard defines service semantics, primitives, parameters, management information (MIB) and a conformance statement proforma, but does not mandate implementation details for particular onboard data links — those are to be defined separately by missions, agencies or CCSDS documents. The standard is intended to be used in conjunction with the SOIS Green Book.

Key topics and requirements

• Definition of the Subnetwork Memory Access Service interface: request/response primitives and behaviour required for memory read and write operations across subnetworks.
• Service parameters and conventions (data organization, bit-numbering and primitive parameter semantics).
• Management Information Base (MIB): management objects and configuration options relevant to the service.
• Quality of Service and security considerations at the service level (implementation-specific details left to link/protocol specifications).
• Conformance and documentation: service conformance statement proforma for missions/equipment claiming SMAS support.
• Intended application: simple direct memory access for data systems and low-capability devices; a common service interface independent of underlying link technology.

Typical use and users

Primary users are spacecraft system architects, onboard data-system designers, mission integration engineers, and agencies implementing SOIS/CCSDS-compliant subsystems. The standard is used to specify service-level behaviour in mission architectures, to produce link- and protocol-specific implementations, and to prepare conformance documentation for multi-agency or cross-supported missions.

Related standards

ISO 18426:2013 is part of the SOIS family of standards (other related ISO documents published in the same program include ISO 18425, 18427, 18428, 18438, etc.), and it was adopted from CCSDS material (CCSDS 852.0-M-1, Magenta Book). It is intended to be applied together with the Spacecraft Onboard Interface Services Green Book and other SOIS service documents; mission- and link-specific protocols are managed by agencies or CCSDS publications.

Keywords

SOIS, Subnetwork Memory Access Service, SMAS, spacecraft onboard interface, CCSDS 852.0-M-1, memory access, MIB, primitives, onboard subnetwork, ICS 49.140.

FAQ

Q: What is this standard?

A: ISO 18426:2013 is an ISO international standard that specifies the Spacecraft Onboard Interface Services Subnetwork Memory Access Service (SMAS) — the service-level interface and behaviour for accessing distributed memory across an onboard subnetwork.

Q: What does it cover?

A: It covers the service definition (primitives, parameters, data conventions), management objects (MIB), conformance proforma, and service-level considerations (QoS, security conceptually). It does not define link- or protocol-level implementations.

Q: Who typically uses it?

A: Spacecraft system architects, onboard data-system and firmware engineers, mission integrators, and standards/compatibility teams in space agencies and contractors who implement or verify SOIS-compliant services.

Q: Is it current or superseded?

A: As published, ISO 18426:2013 is the Edition 1 (2013) document and is listed as Published by ISO; ISO lifecycle records show the standard under review in periodic reviews (ISO standards are normally reviewed every five years). There is no ISO record of a superseding edition as of the ISO bibliographic entry. Users should confirm the status with ISO or their national standards body for the very latest lifecycle actions before procurement or formal referencing.

Q: Is it part of a series?

A: Yes — it is part of the Spacecraft Onboard Interface Services (SOIS) family of ISO documents and is closely tied to CCSDS SOIS material (adopted from CCSDS 852.0-M-1). It is intended to be used together with the SOIS Green Book and other SOIS service standards.

Q: What are the key keywords?

A: SOIS; Subnetwork Memory Access; SMAS; onboard interface; CCSDS; memory read/write; MIB; primitives; spacecraft data systems; ICS 49.140.