| 单词 | H.221 |
| 释义 | H.221 The ITU-T Recommendation for frame structure for a channel of 64–1920 kbps in audiovisual teleservices. H.221 is included in the ITU-T H.320 umbrella recommendation for videoconferencing and multimedia communications over narrowband ISDN (N-ISDN). See also H.320. |
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