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Recommendation V.21 (11/1988): 300 bits per second duplex modem standardized for use in the general switched telephone network

recommendation/international standard from the International Telecommunication Union
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Recommendation V.21 (11/1988): 300 bits per second duplex modem standardized for use in the general switched telephone network

Summary

Recommendation V.21 (11/1988): 300 bits per second duplex modem standardized for use in the general switched telephone network is an ITU-T recommendation version[1].

Key Facts

  • Recommendation V.21 (11/1988): 300 bits per second duplex modem standardized for use in the general switched telephone network's instance of is recorded as 300 bits per second duplex modem standardized for use in the general switched telephone network — instance of (P31): ITU-T recommendation version[2].
  • Recommendation V.21 (11/1988): 300 bits per second duplex modem standardized for use in the general switched telephone network's publisher is recorded as 300 bits per second duplex modem standardized for use in the general switched telephone network — publisher (P123): ITU Telecommunication Standardization Sector[3].
  • Recommendation V.21 (11/1988): 300 bits per second duplex modem standardized for use in the general switched telephone network's edition number is recorded as 11/1988[4].
  • Recommendation V.21 (11/1988): 300 bits per second duplex modem standardized for use in the general switched telephone network's language of work or name is recorded as 300 bits per second duplex modem standardized for use in the general switched telephone network — language of work or name (P407): English[5].
  • Recommendation V.21 (11/1988): 300 bits per second duplex modem standardized for use in the general switched telephone network's publication date is recorded as +1988-11-25T00:00:00Z[6].
  • Recommendation V.21 (11/1988): 300 bits per second duplex modem standardized for use in the general switched telephone network's official website is recorded as https://www.itu.int/rec/T-REC-V.21-198811-I/en[7].
  • Recommendation V.21 (11/1988): 300 bits per second duplex modem standardized for use in the general switched telephone network's work available at URL is recorded as https://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-V.21-198811-I!!PDF-E&type=items[8].
  • Recommendation V.21 (11/1988): 300 bits per second duplex modem standardized for use in the general switched telephone network's number of pages is recorded as {'unit': '1', 'amount': '+7'}[9].
  • Recommendation V.21 (11/1988): 300 bits per second duplex modem standardized for use in the general switched telephone network's standards body is recorded as 300 bits per second duplex modem standardized for use in the general switched telephone network — standards body (P1462): International Telecommunication Union[10].
  • Recommendation V.21 (11/1988): 300 bits per second duplex modem standardized for use in the general switched telephone network's title is recorded as 300 bits per second duplex modem standardized for use in the general switched telephone network[11].
  • Recommendation V.21 (11/1988): 300 bits per second duplex modem standardized for use in the general switched telephone network's ITU-T Recommendation is recorded as V.21 (11/1988)[12].

Body

Authorship and Creation

Recommendation V.21 (11/1988): 300 bits per second duplex modem standardized for use in the general switched telephone network's publisher is recorded as 300 bits per second duplex modem standardized for use in the general switched telephone network — publisher (P123): ITU Telecommunication Standardization Sector[3].

Publication

Recommendation V.21 (11/1988): 300 bits per second duplex modem standardized for use in the general switched telephone network's publication date is recorded as +1988-11-25T00:00:00Z[6]. Its language of work or name is recorded as 300 bits per second duplex modem standardized for use in the general switched telephone network — 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.

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 V.21 (11/1988): 300 bits per second duplex modem standardized for use in the general switched telephone network. Retrieved May 3, 2026, from https://4ort.xyz/entity/recommendation-v-21-11-1988-300-bits-per-second-duplex-modem-standardized-for-use-in-the-general-switched-telephone-network
MLA “Recommendation V.21 (11/1988): 300 bits per second duplex modem standardized for use in the general switched telephone network.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/recommendation-v-21-11-1988-300-bits-per-second-duplex-modem-standardized-for-use-in-the-general-switched-telephone-network.
BibTeX @misc{4ortxyz_recommendation-v-21-11-1988-300-bits-per-second-duplex-modem-standardized-for-use-in-the-general-switched-telephone-network_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Recommendation V.21 (11/1988): 300 bits per second duplex modem standardized for use in the general switched telephone network}}, year = {2026}, url = {https://4ort.xyz/entity/recommendation-v-21-11-1988-300-bits-per-second-duplex-modem-standardized-for-use-in-the-general-switched-telephone-network}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Recommendation V.21 (11/1988): 300 bits per second duplex modem standardized for use in the general switched telephone network — https://4ort.xyz/entity/recommendation-v-21-11-1988-300-bits-per-second-duplex-modem-standardized-for-use-in-the-general-switched-telephone-network (retrieved 2026-05-03)

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