Library items tagged:

Gatekeepers

Anonymous
Tuesday, January 24, 2012 - 19:12
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References and sources

Anonymous
Tuesday, January 24, 2012 - 07:54
Videoconferencing
data sharing
development
JANET Services JANET Videoconferencing Services Under Development: For more information please see the Development section The Welsh Video Network: http://www.wvn.ac.uk/ Standards The Standards Documents H.320 and H.323: http://www.itu.int/rec/recommendation.asp?type=products&parent=TRECh
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Appendix: firewalls and port numbers for H.323 data sharing

Anonymous
Tuesday, January 24, 2012 - 07:53
datasharing
Videoconferencing
Firewalls and port numbers for H.323 data sharing: 80 Static IP HTTP Interface MS ILS (Optional) 389 Static TCP ILS Registration MS ILS / LDAP 1503 Static TCP T
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Conclusion

Anonymous
Tuesday, January 24, 2012 - 07:53
Videoconferencing
data sharing
There are a number of different ways of sharing data and collaborating on applications while taking part in a videoconference. Many of these are proprietary, and often have the drawback that they share the data in-band using valuable bandwidth (and computing resources) that would otherwise be available to the video and audio data.
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New developments

Anonymous
Tuesday, January 24, 2012 - 07:52
Videoconferencing
data sharing
Windows Messenger As has been mentioned, there are no plans to upgrade Microsoft NetMeeting beyond the current version. In the latest operating system to be released by Microsoft XP the Instant Messenger service 'Windows Messenger' has all the functionality of Windows NetMeeting. As well as audio and video conferencing, it also includes a text chat window, shared whiteboard, file transfer, desktop and application sharing, and has a look and feel similar to that of NetMeeting.
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Alternative approaches

Anonymous
Tuesday, January 24, 2012 - 07:52
Videoconferencing
data sharing
Other Operating Systems
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Microsoft Windows Netmeeting

Anonymous
Tuesday, January 24, 2012 - 07:52
Videoconferencing
data sharing
NetMeeting
Figure 3. Microsoft NetMeeting 3.01: 'Data Only' view
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Out-of-band data sharing

Anonymous
Tuesday, January 24, 2012 - 07:51
Videoconferencing
data sharing
Videoconferencing applications are real-time applications that generate large amounts of data which need to be transported across networks very quickly to be of use. Even slight delays in the transmission of data can result in impairments to picture or audio quality. For these reasons it makes sense to give the audio and video a clear path, without the extra data traffic of the T.120 session. The out-of-band method relies on a completely separate call being made for the data sharing element of a conference.
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In-band data sharing

Anonymous
Tuesday, January 24, 2012 - 07:51
Videoconferencing
data sharing
This is where a maximum bandwidth has been allocated to a videoconference (by choice, due to network capacity, or the limitations of the equipment) and the addition of data sharing is handled within the same connection and hence the same bandwidth limits. Document Camera The simplest way to share data within a videoconference is to point the camera at a printout. This method probably yields the poorest quality, but has been known to work when all else fails!
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Data sharing standards

Anonymous
Tuesday, January 24, 2012 - 07:51
Videoconferencing
data sharing
The standards that are relevant to contemporary videoconferencing are: H.320 for circuit-based networks, such as ISDN, and H.323 for packet-based networks, such as the Internet. Both of these standards are International Telecommunications Union (ITU) Recommendations (the formal name the ITU uses for its standards). They can be found at: http://www.itu.int/rec/recommendation.asp?type=products&parent=TRECh/
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