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Recommendation U.12 (11/1988): Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)

superseded recommendation/international standard from the International Telecommunication Union
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Recommendation U.12 (11/1988): Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)

Summary

Recommendation U.12 (11/1988): Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling) is an ITU-T recommendation version[1].

Key Facts

  • Recommendation U.12 (11/1988): Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)'s instance of is recorded as Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling) — instance of (P31): ITU-T recommendation version[2].
  • Recommendation U.12 (11/1988): Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)'s publisher is recorded as Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling) — publisher (P123): ITU Telecommunication Standardization Sector[3].
  • Recommendation U.12 (11/1988): Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)'s edition number is recorded as 11/1988[4].
  • Recommendation U.12 (11/1988): Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)'s language of work or name is recorded as Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling) — language of work or name (P407): English[5].
  • Recommendation U.12 (11/1988): Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)'s publication date is recorded as +1988-11-25T00:00:00Z[6].
  • Recommendation U.12 (11/1988): Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)'s official website is recorded as https://www.itu.int/rec/T-REC-U.12-198811-S/en[7].
  • Recommendation U.12 (11/1988): Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)'s work available at URL is recorded as https://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-U.12-198811-S!!PDF-E&type=items[8].
  • Recommendation U.12 (11/1988): Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)'s number of pages is recorded as {'unit': '1', 'amount': '+30'}[9].
  • Recommendation U.12 (11/1988): Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)'s standards body is recorded as Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling) — standards body (P1462): International Telecommunication Union[10].
  • Recommendation U.12 (11/1988): Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)'s title is recorded as Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)[11].
  • Recommendation U.12 (11/1988): Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)'s cites work is recorded as Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling) — cites work (P2860): Recommendation F.69 (11/1988): Plan for telex destination codes[12].
  • Recommendation U.12 (11/1988): Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)'s cites work is recorded as Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling) — cites work (P2860): Recommendation S.9 (11/1988): Switching equipment of start-stop apparatus[13].
  • Recommendation U.12 (11/1988): Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)'s cites work is recorded as Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling) — cites work (P2860): Recommendation U.1 (11/1988): Signalling conditions to be applied in the international telex service[14].
  • Recommendation U.12 (11/1988): Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)'s cites work is recorded as Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling) — cites work (P2860): Recommendation U.11 (11/1988): Telex and gentex signalling on intercontinental circuits used for intercontinental automatic transit traffic (type C signalling)[15].
  • Recommendation U.12 (11/1988): Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)'s cites work is recorded as Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling) — cites work (P2860): Recommendation U.15 (11/1988): Interworking rules for international signalling systems according to Recommendations U.1, U.11 and U.12[16].
  • Recommendation U.12 (11/1988): Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)'s cites work is recorded as Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling) — cites work (P2860): Recommendation U.41 (11/1988): Changed address interception and call redirection in the telex service[17].
  • Recommendation U.12 (11/1988): Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)'s cites work is recorded as Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling) — cites work (P2860): Recommendation X.121 (11/1988): International numbering plan for public data networks[18].
  • Recommendation U.12 (11/1988): Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)'s cites work is recorded as Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling) — cites work (P2860): Recommendation X.70 (11/1988): Terminal and transit control signalling system for start-stop services on international circuits between anisochronous data networks[19].
  • Recommendation U.12 (11/1988): Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)'s cites work is recorded as Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling) — cites work (P2860): Recommendation X.71 (11/1988): Decentralized terminal and transit control signalling system on international circuits between synchronous data networks[20].
  • Recommendation U.12 (11/1988): Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)'s cites work is recorded as Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling) — cites work (P2860): Recommendation X.87 (10/2003): Multiple services ring based on RPR[21].
  • Recommendation U.12 (11/1988): Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)'s ITU-T Recommendation is recorded as U.12 (11/1988)[22].

Body

Authorship and Creation

Recommendation U.12 (11/1988): Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)'s publisher is recorded as Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling) — publisher (P123): ITU Telecommunication Standardization Sector[3].

Publication

Recommendation U.12 (11/1988): Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)'s publication date is recorded as +1988-11-25T00:00:00Z[6]. Its language of work or name is recorded as Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling) — language of work or name (P407): English[5].

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [2] ↑ . wikidata.org.
  2. [3] ↑ . wikidata.org.
  3. [4] ↑ . wikidata.org.
  4. [5] ↑ . wikidata.org.
  5. [6] ↑ . wikidata.org.
  6. [7] ↑ . wikidata.org.
  7. [8] ↑ . wikidata.org.
  8. [9] ↑ . wikidata.org.
  9. [10] ↑ . wikidata.org.
  10. [11] ↑ . wikidata.org.
  11. [12] ↑ . wikidata.org.
  12. [13] ↑ . wikidata.org.
  13. [14] ↑ . wikidata.org.
  14. [15] ↑ . wikidata.org.
  15. [16] ↑ . wikidata.org.
  16. [17] ↑ . wikidata.org.
  17. [18] ↑ . wikidata.org.
  18. [19] ↑ . wikidata.org.
  19. [20] ↑ . wikidata.org.
  20. [21] ↑ . wikidata.org.
  21. [22] ↑ . wikidata.org.

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

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Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). Recommendation U.12 (11/1988): Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling). Retrieved May 3, 2026, from https://4ort.xyz/entity/recommendation-u-12-11-1988-terminal-and-transit-control-signalling-system-for-telex-and-similar-services-on-international-circuits-type-d-signalling-
MLA “Recommendation U.12 (11/1988): Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling).” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/recommendation-u-12-11-1988-terminal-and-transit-control-signalling-system-for-telex-and-similar-services-on-international-circuits-type-d-signalling-.
BibTeX @misc{4ortxyz_recommendation-u-12-11-1988-terminal-and-transit-control-signalling-system-for-telex-and-similar-services-on-international-circuits-type-d-signalling-_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Recommendation U.12 (11/1988): Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)}}, year = {2026}, url = {https://4ort.xyz/entity/recommendation-u-12-11-1988-terminal-and-transit-control-signalling-system-for-telex-and-similar-services-on-international-circuits-type-d-signalling-}, note = {Accessed: 2026-05-03}}
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