The ITU-T V-Series Recommendations on Data communication over the telephone network specify the protocols that govern approved modem communication standards and interfaces.[1]

Note: the bis and ter suffixes are ITU-T standard designators of successive iterations of a standard (bis and ter are derived from the Latin for "twice" and "thrice").

General standards

Applies to V.1–V.9

Interfaces and voiceband modems

Applies to V.10–V.34

Ad hoc standards

In order to gain first-mover advantage, many modem companies introduced models based on upcoming V-series standards before they reached final ratification. In other cases, companies introduced non-standard systems but gave them ITU-like names.

Wideband modems

Applies to V.35–V.39

Error control and data compression

Applies to V.40–V.49

Simultaneous transmission of data and other signals

Applies to V.60–V.99

Interworking with other networks

Applies to V.100–V.199

Interface layer specifications for data communication

Applies to V.200–V.249

Digital circuit modems

Applies to V.400–V.499

See also

References

  1. ^ ITU-T (2006-09-29). "Data communication over the telephone network". ITU. Retrieved 2008-03-02.
  2. ^ Supplement (04/95) to Recommendation V.25ter - Serial asynchronous automatic dialling and control
  3. ^ "V.32 : A family of 2-wire, duplex modems operating at data signalling rates of up to 9600 bit/s for use on the general switched telephone network and on leased telephone-type circuits". www.itu.int. Retrieved 2020-08-20.
  4. ^ "V.32bis : A duplex modem operating at data signalling rates of up to 14 400 bit/s for use on the general switched telephone network and on leased point-to-point 2-wire telephone-type circuits". www.itu.int. Retrieved 2020-08-20.
  5. ^ Vendors rallying around high-speed modem scheme
  6. ^ "V.34: a modem operating at data signalling rates of up to 28 800 bit/s for use on the general switched telephone network and on leased point-to-point 2-wire telephone-type circuits". www.itu.int. Retrieved 2020-07-05.
  7. ^ "V.34: A modem operating at data signalling rates of up to 33 600 bit/s for use on the general switched telephone network and on leased point-to-point 2-wire telephone-type circuits". www.itu.int. Retrieved 2020-07-05.
  8. ^ "V.34: A modem operating at data signalling rates of up to 33 600 bit/s for use on the general switched telephone network and on leased point-to-point 2-wire telephone-type circuits". www.itu.int. Retrieved 2020-07-05.
  9. ^ "V.FC"
  10. ^ Willdig, Karl; Patrik Chen (August 1994). "What You Need to Know about Modems". Archived from the original on 2007-01-04. Retrieved 2008-03-02.
  11. ^ Mitronov, Pavel (2001-06-29). "Modem compression: V.44 against V.42bis". Pricenfees.com. Archived from the original on 2017-02-02. Retrieved 2008-03-02.