ISDN Video Telephony » History » Version 1
laforge, 11/20/2022 04:15 PM
| 1 | 1 | laforge | h1. ISDN Video Telephony |
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| 3 | ISDN supports video telephony. Deutsche Bundespost was runnig an ISDN video telephony pilot project in 1991. |
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| 5 | h2. Relevant standards |
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| 7 | * ITU-T F.721 (high level service description) |
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| 8 | * ITU-T H.221 (multiplex layer, divides B channel into 8 sub-channels of 8kbps) |
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| 9 | * ITU-T H.242 |
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| 10 | * ITU-T H.320 |
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| 11 | * ITU-T H.261 (video codec) |
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| 13 | ISDN video calls can operate either over one or over 2 B channels. |
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| 15 | h2. Further pages |
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| 17 | {{child_pages}} |
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| 19 | h2. Marketing picture of an early ALCATEL prototype ISDN phone |
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| 21 | !alcatel-isdn-video.jpg! |
