H.320
| Narrow-band visual telephone systems and terminal equipment | |
| Status | Published |
|---|---|
| Year started | 1990 |
| Latest version | (03/04) March 2004 |
| Organization | H.265 |
| Website | https://www.itu.int/rec/T-REC-H.320 |
H.320 or Narrow-band visual telephone systems and terminal equipment is an umbrella Recommendation by the
It is formally named as
The service requirements for visual telephone services are presented in ITU-T Recs F.720 for videotelephony and F.702 for videoconference. Video and audio coding systems and other technical aspects common to audiovisual services are covered in other Recommendations in the H.200/F.700-series.
Narrow-band for this specification is defined as bit rates ranging from 64 kbit/s to 1920 kbit/s. This channel capacity may be provided as a single B/H0/H11/H12-channel or multiple B/H0-channels in ISDN.
Used video codecs: H.261, and optionally
Used audio codecs: G.711, and optionally G.722, G.728, G.723.1, G.729. (Example of usage: If a visual telephone interworks with a wideband speech terminal, G.722 audio may be used instead of G.711 audio.)[2]
See also
References
- ^ Davis, Andrew (13 June 1997). "The H.320 Recommendation Overview". EE Times. Retrieved 7 November 2019.
- ^ a b c ITU-T (2004-03) (PDF) H.320 : Narrow-band visual telephone systems and terminal equipment, Retrieved on 2009-07-21
External links
- ITU-T website
- ITU-T H.320 : Narrow-band visual telephone systems and terminal equipment - technical specification