ISO 18440-2016 PDF

Full title and description

ISO 18440:2016 — Space data and information transfer systems — Space link extension — Internet protocol for transfer services. This International Standard defines the Internet SLE Protocol One (ISP1) used for transfer of SLE Protocol Data Units (PDUs) between an SLE service user and an SLE service provider, specifying association procedures, messaging, connection monitoring and methods for cross‑platform data representation.

Abstract

ISO 18440:2016 defines a protocol for transfer of SLE PDUs between an SLE user and an SLE provider system in terms of: (a) the procedures used to establish and release associations; (b) the messages exchanged on an established association; (c) the procedures used to monitor the status of data communication connections; and (d) the methods used to ensure that data are converted between different formats and representations on different platforms. It does not specify individual designs or products, the configuration of the data communications infrastructure (including TCP/IP configuration), or how addresses (IP addresses and TCP port numbers) are agreed, assigned and communicated.

General information

• Status: Published (Edition 2) — confirmed in ISO systematic review 2023.
• Publication date: 3 November 2016 (published 2016‑11‑03).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 49.140 — Space systems and operations.
• Edition / version: Edition 2 (2016).
• Number of pages: 67 pages.

All items above are taken from the ISO bibliographic record for ISO 18440:2016 (official ISO product page).

Scope

This standard specifies an Internet‑based protocol (ISP1) for exchanging SLE PDUs between an SLE user application and an SLE provider. It covers the procedures for establishing and releasing associations, the message set and sequencing on established associations, monitoring and diagnostic procedures for the communication connection, and mechanisms to ensure correct conversion/representation of data across platforms. The standard intentionally does not mandate implementations, TCP/IP stack configuration, or address/port assignment mechanisms.

Key topics and requirements

• Definition of the Internet SLE Protocol One (ISP1) for transfer of SLE PDUs.
• Procedures to establish, maintain and release associations between SLE user and provider.
• Message types, sequencing and expected behaviours on established associations.
• Connection status monitoring, diagnostic codes and state management for transfer services.
• Requirements for data representation and conversion to permit interoperability across platforms (encoding/format considerations).
• Explicit exclusions: does not specify product designs, TCP/IP configuration details or address assignment mechanisms.

Typical use and users

Primary users are spacecraft operations and mission ground‑segment engineers, developers of SLE service providers and clients, systems integrators, and vendors supplying ground‑segment communications and middleware that must interoperate with SLE transfer services. The standard supports cross‑agency/interoperable exchange of link data and is commonly used alongside CCSDS SLE recommendations and related ISO SLE application interface standards.

Related standards

ISO 18440:2016 is part of the ISO SLE family (Space Link Extension) and relates to other ISO documents that specify SLE APIs and transfer‑service definitions (for example ISO 18441, ISO 18442 … ISO 18446 series items covering specific SLE services). It replaces ISO 18440:2013 (withdrawn) and is intended to be used together with the CCSDS SLE recommendations and the ISO SLE application interface documents.

Keywords

Space Link Extension, SLE, ISP1, Internet SLE Protocol One, SLE PDUs, space data transfer, ground segment, CCSDS, ISO/TC 20/SC 13, TCP/IP (protocol transport), ASN.1 (encoding contexts referenced in earlier editions).

FAQ

Q: What is this standard?

A: ISO 18440:2016 is an international standard that defines an Internet‑based protocol (ISP1) for transferring Space Link Extension (SLE) Protocol Data Units between an SLE user and an SLE provider.

Q: What does it cover?

A: It specifies procedures for establishing and releasing associations, the message set and behaviour on associations, monitoring procedures for communication connections, and methods to ensure interoperable data representation across platforms. It does not prescribe specific product designs, TCP/IP configuration details, or address allocation mechanisms.

Q: Who typically uses it?

A: Spacecraft mission operators, ground‑segment developers, integrators and vendors building SLE client or provider implementations, and organizations following CCSDS/ISO ground communications standards.

Q: Is it current or superseded?

A: ISO 18440:2016 is the 2nd edition (published 3 November 2016). The ISO record shows the 2016 edition as published and confirmed in the ISO 5‑year review cycle (confirmation recorded in 2023), so the 2016 edition is the current published edition (it replaced ISO 18440:2013).

Q: Is it part of a series?

A: Yes. ISO 18440 is part of a family of SLE standards (ISO 18440–18446 series and related documents) that together define transfer services, application interfaces and service‑specific APIs for Space Link Extension. These companion standards cover APIs and specific SLE transfer services used in mission operations.

Q: What are the key keywords?

A: Space Link Extension (SLE), ISP1, SLE PDUs, Internet protocol for transfer services, CCSDS, interoperability, ground segment communications, ISO/TC 20/SC 13.