# ISO 22671:2011 — Withdrawn and superseded ISO standards

For ISO 22671:2011, item title is Space data and information transfer systems — Space link extension (SLE) — Forward communications link transmission unit (CLTU) service; status code is 9599; successor is ISO 22671:2021; withdrawn / published date is 2011-11-08, recorded from its source on 2026-08-05.

- **Identifier:** ISO 22671:2011 _(verified: appears in the quote below)_
- **Item title:** Space data and information transfer systems — Space link extension (SLE) — Forward communications link transmission unit (CLTU) service _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 22671:2021
- **Withdrawn / published date:** 2011-11-08 _(verified: appears in the quote below)_

## What the source says

> 58052,IS,,ISO 22671:2011,Space data and information transfer systems — Space link extension (SLE) — Forward communications link transmission unit (CLTU) service,Systèmes de transfert des informations et données spatiales — Extension de liaisons spatiales (SLE) — Service de l'unité de transmission pour la liaison d'envoi de télécommande (CLTU),2011-11-08,3,['49.140'],ISO/TC 20/SC 13,9599,[43443],[74557],['en'],159,"<p>ISO 22671:2011 defines the Communications Link Transmission Unit (CLTU) service in conformance with the transfer services specified in CCSDS 910.4-B-2 (equivalent to ISO 15396). The Forward CLTU service is a Space Link Extension (SLE) transfer service that enables a mission to s

## Source

- https://isopublicstorageprod.blob.core.windows.net/opendata/_latest/iso_deliverables_metadata/csv/iso_deliverables_metadata.csv

Last verified: 2026-08-05. Review by: 2027-02-01.
Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).