Space data and information transfer systems — Space Link Extension — Internet Protocol for Transfer Services
The Space Link Extension (SLE) Reference Model identifies a set of SLE Transfer Services that enable missions to send forward space link data units to a spacecraft and to receive return space link data units from a spacecraft. A subset of these services is specified by the SLE Transfer Service Recommended StandardDetails. The SLE Transfer Service Recommended StandardDetails specify:
However, they deliberately do not specify the methods or technologies required for communications.
ISO 18440:2013 defines a protocol for transfer of SLE Protocol Data Units (PDUs) defined in the SLE Transfer Service Recommended StandardDetails using the Internet protocols TCP (Transmission Control Protocol and IP (Internet Protocol) for data transfer and the Abstract Syntax Notation One (ASN.1) for data encoding. This protocol is referred to as the Internet SLE Protocol One (ISP1).
ISO 18440:2013 defines a protocol for transfer of SLE PDUs between an SLE user and an SLE provider system in terms of:
It does not specify:
ISO 18440:2013 responds to the requirements imposed by the International StandardDetails for SLE transfer services that were available when this International Standard was released. The protocol specified in ISO 18440:2013 conforms to the requirements on data communication services set forth in those International StandardDetails.
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