ISO 18427:2013

INTERNATIONAL ISO
STANDARD 18427
First edition
2013-06-01

Space data and information transfer
systems — Spacecraft Onboard Interface
Services — Subnetwork Synchronization
Service
Systèmes de transfert des informations et données spatiales —
Services d'interfaces à bord des véhicules spatiaux — Service de
synchronisation par sous-réseau




Reference number
ISO 18427:2013(E)
©
ISO 2013

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ISO 18427:2013(E)

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ISO 18427:2013(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
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International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of
ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2. www.iso.org/directives
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Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
ISO 18427 was prepared by the Consultative Committee for Space Data Systems (CCSDS) (as
CCSDS 853.0-M-1, December 2009) and was adopted (without modifications except those stated in Clause 2
of this International Standard) by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee
SC 13, Space data and information transfer systems.

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INTERNATIONAL STANDARD ISO 18427:2013(E)

Space data and information transfer systems — Spacecraft
Onboard Interface Services — Subnetwork Synchronization
Service
1 Scope
This International Standard is one of a family of documents specifying the SOIS-compliant services to be
provided by onboard subnetworks.
The purpose of this International Standard is to define services and service interfaces provided by the SOIS
Subnetwork Synchronisation Service. Its scope is to specify the service only and not to specify methods of
providing the service over a variety of onboard data links.
This International Standard conforms to the principles set out in the Spacecraft Onboard Interface Services
Green Book and is intended to be applied together with it. The protocols which provide this service are to be
documented for individual links, and this can be in the purview of individual missions, agencies, or CCSDS,
depending on future circumstances.
The scope and field of application are furthermore detailed in subclause 1.2 of the enclosed CCSDS
publication.
2 Requirements
Requirements are the technical recommendations made in the following publication (reproduced on the
following pages), which is adopted as an International Standard:
CCSDS 853.0-M-1, December 2009, Spacecraft Onboard Interface Services — Subnetwork Synchronization
Service.
For the purposes of international standardization, the modifications outlined below shall apply to the specific
clauses and paragraphs of publication CCSDS 853.0-M-1.
Pages i to v
This part is information which is relevant to the CCSDS publication only.
3 Revision of publication CCSDS 853.0-M-1
It has been agreed with the Consultative Committee for Space Data Systems that Subcommittee
ISO/TC 20/SC 13 will be con
...